Very helpful- I bought a new differential preamp and amp but kept coaxial cables and couldn't explain the noise that I created. Eventually went xlr but wish I saw this video prior. In the real end figured that it was caused by halogen sconces emitting noise to the room even on separate electrical drops.
A very good, informational video, and thorough lecture on the two main signal cables, DAmoreEngineering. Thumbs up. The 2 methodologies are explained well. Therefore, we are not going to make mistakes based on connectivity to amplifiers for our hi fi audio systems.
Tony, im a EE in the industrisl industry. I never really had a professional opportunity to work in the Ee field. On the other hand, I have always love the audio end as a hobby. Recently I have embarked into xar audio. I have watched your videos and it rekindled my love of it. I have applied it to my car design and I have excellect car tunes. Thank You. Keep up the instructional videos.
For all the folks hemmimg and hawing over balanced XLR and RCA not being able to carry a balanced signal... An RCA can carry a balanced signal, if it uses a twisted pair wire. The cable assembly will simply be unshielded. We often wire studio installs with telescoping shields, where the shield (pin 1) is disconnected at the input of each device. this drains static and RF back to the Chassis Ground in only one direction, terminating to a common ground bus. This avoids ground loops. The shield in a balanced audio system carries no signal... At least we hope not!
Wow that's some AWESOME info man!! I know this is old but this is however NEVER mentioned anymore lol. I'm a noob and I am glad I found this for my first SQL build!! 👏🏼👏🏼👌👌💪💪🔥
In my experience, it is extremely rare nowadays to use RCA-style for DI signals. Maybe that 's why this info is not common in the industry, These days the industry convention dictates XLR cables for DI. The 3 pins of XLR are signal+, signal- and shield. For example, my CD player has both outputs. All the best, Rob
Take an ohm meter (DMM) and check the resistance from the battery ground connection on amplifier to the RCA outer ring on amplifier (with everything unplugged from amplifier). If you have less than 100 ohms it is a single-ended input.
DAmoreEngineering Wow, thanks for the reply! I know you guys explained the same thing in the video, but for some reason I feel that this explanation is more solid. On an unrelated note, I had always known about your company from Steve Meade's videos, but now once I figure out which type of RCA I need I'll most likely end up buying from you. Keep up the awesome work guys, this type of potential customer relations and not keeping this information hidden and secret like everyone else really shows what kind of a company you are.
lowellaby You have a positive and ground connection on any amplifier that runs on DC. The "battery ground connection" is the big ground connection for which you hook up your main ground wire to.
Thank you very much. This was very helpful. Its funny how you mentioned that the Industries forgot about that technology cuz yeah this is the first time I've ever heard about it. Thanks again
I have never heard of this! One thing I don't understand, the majority of RCA cables marketed for automotive amplifiers seem to be twisted pair. ALL of Rockford Fostgagte's cables are twisted pair, so does that mean they are DI?
Cool. Thank you so much for this. I’m trying to add a phono preamp signal to a b&k avr505 receiver but it has to be a 15’ cable for proper placement of the turntable without drastically altering the setup. I tested the turntable signal with a shorter standard RCA cable (6.6’ Prosolutions Blue Soft analog rca) and it worked great. The new long cable creates low level static/feedback/white noise through the speakers with one end just plugged into the receiver inputs. I believe the new cable is a center lead, shielded coax. This maybe my issue.
What???.... So what Im getting is some gear basically has noise reduction apparently built in to but could possibly not be used with coaxials because of some extra shielding for noise reduction? Really? Is it because like noise reduction wires plus noise reduction (whatever you said in the amp) equals just no noise? Or is there more of a difference then just shielding between a coaxial and twisted cable?
If the head unit has SE outputs and the amplifier has SE inputs = coax cable If the head unit has SE outputs and the amplifier has Diff inputs = twisted pair If the head unit has Diff outputs and the amplifier has Diff inputs = twister pair If the head unit has Diff outputs and the amplifier has SE inputs = bad no matter what as you will shorting out half of the head unit's outputs. In this case you would need an amplifier with Diff inputs or a converter to convert the head unit's outputs to SE
DAmoreEngineering, Sorry for the late reply. Just saw this. Most head units with Diff outputs has a current limiting resistor so when it connected to a grounded input, there is no harm done. This is done for compatibility. It is true the level is then down 6db which is the proper level for most unbalanced inputs.
Any chance you know what it would be considered if I'm going from an IPhone Lightening connector to RCA converter back to a BOSS car amplifier (pf1800)?
Hello i have a weird problem. I have 3 Jvc ks ax6500 and they all work. And after measuring the positive and negative input to ground the value is 10Kohm on all 4 channels But from 1 rca negative to the other 3 rca negative it's 0 ohms, is this a problem?
So, what is Kimber PBJ? It looks like twisted pair (braided, actually). No shield. But it's not called out as specifically single-ended or differential. It sounds the same as my Blue Jeans LC-1. I guess I always assumed that all RCA cable is single-ended.
Thanks Mr. D'Amore for the quality information. Always good to hear it from a quality engineer rather than from someone who thinks they know what they are talking about. Love all the new product you are developing and can't wait to see more.
What kind of equipment uses RCA connectors for differential signals? I notice this video offers no context at all in this regard. Working in pro-audio my whole life, I never encountered RCA connectors being used for differential signals, and doing so would prevent differential with shielding. But maybe this video isn't even about audio signals.....some context would be useful.
You may have had experience with this but when running RCA cables close to cabling for light clusters induces noise, for example in my case the loom is down the left hand side of an E90 and following the factory loom which are basically the cables going to the light cluster down the left hand side down to where the factory amplifier normally is, when you put your foot on the brake static noise can be heard. I want to keep my RCA run tidy with the factory cabling but have found it to be problematic in that it picks up EMI whenever I put my foot on the brake. I have verified this when disconnecting the plug that runs to the rear light cluster and the noise is no longer there. The cabling is the 6 channel Stinger 4000 series. I have tried other cables but to no avail. Running it down the centre console works better but I have found it to be untidy for cable management. The headunit is an aftermarket 80prs, so it’s a straight RCA run from the headunit to the amp. The amplifier is a class D five channel JBL GTR 7535.
Really great information, just a small suggestion though. If you put this comment in the description that would be great for later use in case it is not on top when someone tries to go back to see this video. Thanks for the awesome information!
I did not experience any difference in quality or performance on my Audison LRX 1.1k with cheap and expensive RCA cables, tried both of these types as well. Marketing crap.
The issue with Differential Input Cable doesn't surprise me. Monster Cable had manufactured these since the 1990's with Interlink 300 & 400 Series. There are White Stickers with Arrows denoting the Signal Flow which plugs into the source.
I've been looking for a decent explanation on RCAs and how to wire them up for different scenarios for awhile. Although this isn't exactly that Tony's explanation combined with knowledge I already learned just turned the light bulb on in my head! Lol
Mr Damore, are you able to show us how one sounds compared to the other if you use the wrong one? I know you are busy, but I really would appreciate it! Or maybe anyone else has a link to a video like that? Thank you! -iMickey503-PDX
Testing both of my amplifiers, a 4 channel Pioneer and a mono Kicker, I got roughly 17k ohms on the Pioneer, and roughly 6-30m ohms on the Kicker. The Kicker amplifier specifies that it's a differential model, while the Pioneer doesn't mention anything about the type of input it uses. So I am going to assume that the Pioneer is a single ended based off of the lower resistance shown vs the known differential resistance shown on the Kicker. I hope I am correct in my assumption!
cool video thanks. Personally, I'm not a fan of RCA connectors to begin with, and think its old technology. But sometimes, that's all you get, and why I feel the whole car audio industry is behind the times, with little (no?) innovation in the last 20 years.
I have got 2 question. How can i know if cable is balanced or unbalanced if i look at it or any other way to find out.? 2. If my amp has balanced rca input and i have got balanced rca cable do i need also headunit or any other source wirh balanced rca output?
Wouldn't this require a HU with differential outputs? Otherwise, how would would the sine waves become inverted to one another across the twisted pairs to begin with? Seems to me that the wire that goes to the sleeve on a twisted pair rca would not carry a wave at all if the HU has 'single ended' outputs, as it were. From what i see after a google search, HUs with differential outs are a unicorn, only a few boutique models have ever had them.
Thank you. but i am not sure i understand how to tell if the amp is single ended: should it have no resistance between the rca input and the ground ? i think you mentioned it should have 1000 ohm or less ?
Hi, recently bought an audiolab 8300cdq and Audiolab 8300XP. Reading through the manual it make no mention of SE or DI RCA connection. I dont have an Ohm meter so is there another way to tell?
I’m trying to figure out if my amplifiers are differential or single ended. Mosconi as100.4 measured approximately 1100 ohms. The amplifiers are measured that are differential are like in the 10 thousand plus ohms readings.
To be more understandable, differential input means balanced type cable, more often come in XLR form (Usually Starquad structure). Single ended not necessarily in coaxial, but more often in RCA type. Unbalanced RCA may consist 2 or more cores of wire in TRS cable.
I have big questions. Please. My HU is a Pioneer DEH-80PRS. From what is available online I have found that this might be a "single ended" RCA preout head unit. If I use twisted/ balanced RCA cables to an amplifier that is ALSO "single ended," what could happen? Is there any loss or risk? Any gain? Any chance of damage?? Also, my DMM says 1166 on the ohm reading when connecting the positive lead to the RCA Input outer ring and the negative lead to the ground on the disconnected/ unpowered amp model amp PX1900.4 Massive. Does this mean the amp is "single ended?" Or "differential?"
There is a question that I've been wanting to get answered. If I measure a balanced car audio signal with a digital multimeter and get 8 volts reading would that become 4 volts going into an unbalanced RCA input at an amplifier? That would seem to be the case because the inverted signal or basically half the voltage is getting grounded at The amp anyways so the voltage will be cut in half right?
Is it okay to use a twisted cable on a single-ended input? You said it is bad if you use a coaxial RCA cable on a differential input, but I did not hear (or maybe I missed it) you say if you used twisted cable on a single-ended input.
How does the end consumer know which one to use? How would the end consumer know what kind of outputs the head unit has and what kind of inputs the amp has?
This probably explains why I had noise I could never find and I was running Stinger 4000 rca from my Audio Control LC2i to my amps. Probably needed regular RCAs and not twisted pairs and I was a victim of just thinking they were better newer technology.
My crossover is single. Would it matter using the double from my head unit to the crossover before it gets to the amps? Only reason I ask is because I just got my expensive twisted rca in today. Wish I saw this video a week ago.
okay so if i get my meter and check for continuity from the amps ground to the shell of the rca coming out of the amp it should beep that means single coax rca and if no beep its twisted pair? is there a way to tell if you need twisted pair? if i was just looking to see if i need it
I'm using DI in my Polk audio amp since November and I haven't had a problem but I'm curious what's the side affect because I didn't understand that much in the video
Per JL website: "JL Audio’s Differential-Balanced Input circuits" ... "This works equally well with differential-balanced, or unbalanced signal sources, making this input architecture compatible with all standard car and marine audio equipment, using standard, unshielded, twisted-pair RCA cables. No special cables are required, unlike the fully balanced connections used in professional audio" (jlaudio.zendesk.com/hc/en-us/articles/209357588-Differential-Balanced-Inputs). ----So which are you exactly referring to? Any specific amp for example?
Why is this not mentioned anywhere ever? This 8 year old video has explained why swapping around RCA's has cured noise in some of my systems when the RCA's themselves had no faults... awesome.
Hey Anthony, another question: would it be the best of both worlds if use a shieded twisted pair, like a CAT6 STP cable and ground the shield? thanks and regards, Dieter
This works 100%, I personally experienced this a few days ago. Has a pair of twisted high quality stinger rca's that were introducing noise, and after replacing them with a $5 junk pair of Aerpro coaxial rca's every bit of noise/whine disappeared.
What's the difference between Differential Input signal system and a Balanced signal system (like an XLR cable) ? I'm guessing DI inversion occurs in the amp (receiving end) and Balanced inversion occurs at the source (transmitting end). Correct me where I'm wrong.
Hey Anthony, nice video! I have a question: I use a Marantz AV7005, which offers XLR out (not sure if balanced) and 9 surround channels run on cheap TDA7492 chip, which has differential inputs. No ground to - , signal passes through 2 op amps before being amplified. The 2 main front channels comes from the Marantz and go to a 845 SET power amplifier. This has the input - grounded. Here comes the question: Knowing that I can get balanced and unbalanced outputs, which cable type should I use where? Thanks and regards, Dieter
Does this mean that you need to know what outputs your head unit has? if the output rca from the head unit is the SE style, then the outer jacket of the rca which would be ground would not work for a DI style cable... could you please elaborate on that point? Thanks.
Would this mix up of RCA on an amplifier cause some scratchiness or quite white noise effect? I'm not talking about alternator whine or something like a ground loop whine, but I mean just the different cable causing noise.
Hmmm. The twisted pair interconnect won't give common-mode rejection if it's used in an UNbalanced system.. I know of no balanced system that uses a phono (RCA) configuration (perhsps there are).. Also, a slight error in presentation (if I heard you correctly). The common noise that comes in off the cable is NOT "out of phase" and thus cancels at the input.. Rather, common mode noise is IN phase and presents the same voltage at the inputs. The amplifier senses the "difference" at the inputs.. Because the amplifier sees the "equal" in phase voltages at the input, the noise is not amplified....
i just bought an Alpine PDX-v9 5 channel amplifier. I want the best cables for this amp. should i use a twisted wire rca? I want the best conduction of sound. i was thinking about using 12 guage speaker wire for the mids and highs. what do you think?
Kindof a dumb question but google searches didn't come up with anything. when testing resistance of rca cables is it bad if white to white is at .5 ohms and black to black is around 1 ohm. FYI resistance doesn't change while wiggling the cords
+robert stobo Hi. No it's not. For what you measure is the resistance on your ohmmeter or multimeters cable. Try it out and just connect the two test probes of your MM together; some multimeters will show some resistance here. Your cables resistance is so low, that your ohmmeter has troubles measuring it . Think of measuring the thickness of a sheet of paper with a folding ruler!
It is inexplicable why amplifier manufacturers don't advise the type of RCA connector that works better - unless of course it makes no difference. I have both types and have never* heard the slightest difference when connecting all these permutations: (1) Sources: Phono stages, CD and SACD disc spinners, Radio, Computer soundcard, DAC: into (2) various pre-amplifiers and integrated amplifiers; (3) between computer and DAC; (4) between Turntable and (4.1) phono stage (4.2) SUT (4.3) Head Amp (4.4) pre-amp. Another point. The DI can have a shield. It can be floating (ie not connected to either of the 'return' connections on the RCA, it can be connected to both (I think this is best), or it can be connected to one end only - usually the source end. *Unshielded connectors have sounded poor when run in close proximity to a power amp or TV. Another vid including 'balanced' connectors may help.
Most noise picked up by RCA cable is 60 hz line and high power radio Being an average car is mostly metal on the outside it becomes a Faraday cage and blocks most interference before it can get to your cables Also proper routing of cables keeps the noise generated by the vehicle at a minimum
So I only have one set of outputs on my head unit. IRunnin 2 amps, so I gotta split em. I only have a pair of twisted wire splitters for my 2 shielded rca cables to go to amps. They are both single ended amps. Will that do ok to run permanently? Or will that cause some unwanted effect??
Ya, except that in car audio, almost every aftermarket HU does not use balanced or differential pre-amp outs. All of the speaker outputs are balanced/differential. So, if a RF P600X4, for example, with balanced-differential inputs, then I presume you can use either type of RCA, but twisted would be better; however, because the HU pre-amp outs are not balanced-differential, it does nothing. -- I just saw this vid again today. There's twisted pair RCAs that have single and even double shielding. In that case, one could use such cables on an amp that has a grounded outer ring.
Interesting video. I think I have a differential amp. I have always been told to stay clear of unshielded twisted cables. When playing from a digital source with my shielded cables I have 0 noise when playing from my phono preamp I have lots of interference. So if I do have a diffential amp (cyrus 8) Would the twisted cable eliminate this noise? I get more confused every day😂
Very helpful- I bought a new differential preamp and amp but kept coaxial cables and couldn't explain the noise that I created. Eventually went xlr but wish I saw this video prior. In the real end figured that it was caused by halogen sconces emitting noise to the room even on separate electrical drops.
Very informative. I didn't even know there were two types of RCAs.
Audio school w/Tony D! Great vid, thanks for sharing your knowledge!
Big D wiz..I'm outta heeeeerrr
A very good, informational video, and thorough lecture on the two main signal cables, DAmoreEngineering. Thumbs up. The 2 methodologies are explained well. Therefore, we are not going to make mistakes based on connectivity to amplifiers for our hi fi audio systems.
Thank you George
Your welcomed, @@TonyInvents
Tony, im a EE in the industrisl industry. I never really had a professional opportunity to work in the Ee field. On the other hand, I have always love the audio end as a hobby. Recently I have embarked into xar audio. I have watched your videos and it rekindled my love of it. I have applied it to my car design and I have excellect car tunes. Thank You. Keep up the instructional videos.
Thanks a bunch Robert
Thank you for explaining this, very helpful as I'm starting to make my own RCA connections.
Excellent presentation. Simple, but effective. You might consider a discussion on UTP vs. STP and if STP how to properly connect the shield.
For all the folks hemmimg and hawing over balanced XLR and RCA not being able to carry a balanced signal... An RCA can carry a balanced signal, if it uses a twisted pair wire. The cable assembly will simply be unshielded. We often wire studio installs with telescoping shields, where the shield (pin 1) is disconnected at the input of each device. this drains static and RF back to the Chassis Ground in only one direction, terminating to a common ground bus. This avoids ground loops. The shield in a balanced audio system carries no signal... At least we hope not!
Thank you
Great video on a subject that nobody seems to ever explain, and is actually important to know.
Wow that's some AWESOME info man!! I know this is old but this is however NEVER mentioned anymore lol. I'm a noob and I am glad I found this for my first SQL build!! 👏🏼👏🏼👌👌💪💪🔥
In my experience, it is extremely rare nowadays to use RCA-style for DI signals. Maybe that 's why this info is not common in the industry,
These days the industry convention dictates XLR cables for DI. The 3 pins of XLR are signal+, signal- and shield. For example, my CD player has both outputs. All the best, Rob
Yes, some car audio companies would use balanced signal with two RCA's. But that's not what Tony Bologna is describing here.
@@RobotUndergroundalways making me hungry man 😂😋
Wow.. I have never heard of this or even heard anyone talk about this.. People need to know this information..Thank you!
The only problem is that nobody lists what kind of RCA input or output they have on their headunit or amplifier.
Take an ohm meter (DMM) and check the resistance from the battery ground connection on amplifier to the RCA outer ring on amplifier (with everything unplugged from amplifier). If you have less than 100 ohms it is a single-ended input.
DAmoreEngineering Wow, thanks for the reply! I know you guys explained the same thing in the video, but for some reason I feel that this explanation is more solid.
On an unrelated note, I had always known about your company from Steve Meade's videos, but now once I figure out which type of RCA I need I'll most likely end up buying from you. Keep up the awesome work guys, this type of potential customer relations and not keeping this information hidden and secret like everyone else really shows what kind of a company you are.
+DAmoreEngineering What exactly is a battery ground connection on an amplifier? Chassis ground won't work? Thanks for your time.
lowellaby You have a positive and ground connection on any amplifier that runs on DC. The "battery ground connection" is the big ground connection for which you hook up your main ground wire to.
@LD Blake I have disputed this topic in these comments many times. You do not need a ground or shield wire to send a differential signal.
Great lesson. Wonderfully simple and eye openings. Thanks
Thank you very much. This was very helpful. Its funny how you mentioned that the Industries forgot about that technology cuz yeah this is the first time I've ever heard about it. Thanks again
I hope I am understanding but what if head unit is differential and amp is single ended?
I doubt that amps with differential inputs are made with RCA jacks instead of XLRs. That would be kind of dumb.
I have never heard of this! One thing I don't understand, the majority of RCA cables marketed for automotive amplifiers seem to be twisted pair. ALL of Rockford Fostgagte's cables are twisted pair, so does that mean they are DI?
Very clear and informative. Please make more this kind of videos!
Very well explained in very simple words,thank You
So the Signal is coming from a what high end CD player, going into a. high end Amplifier? What Audio Equipment has a DIFFERENTIAL OUTPUT? Examples?
Cool. Thank you so much for this. I’m trying to add a phono preamp signal to a b&k avr505 receiver but it has to be a 15’ cable for proper placement of the turntable without drastically altering the setup. I tested the turntable signal with a shorter standard RCA cable (6.6’ Prosolutions Blue Soft analog rca) and it worked great. The new long cable creates low level static/feedback/white noise through the speakers with one end just plugged into the receiver inputs. I believe the new cable is a center lead, shielded coax. This maybe my issue.
Good info. This information definitely was dropped from mainstream industry. Glad to have people like you to bring into light.
What???.... So what Im getting is some gear basically has noise reduction apparently built in to but could possibly not be used with coaxials because of some extra shielding for noise reduction? Really? Is it because like noise reduction wires plus noise reduction (whatever you said in the amp) equals just no noise? Or is there more of a difference then just shielding between a coaxial and twisted cable?
If the head unit has SE outputs and the amplifier has SE inputs = coax cable
If the head unit has SE outputs and the amplifier has Diff inputs = twisted pair
If the head unit has Diff outputs and the amplifier has Diff inputs = twister pair
If the head unit has Diff outputs and the amplifier has SE inputs = bad no matter what as you will shorting out half of the head unit's outputs. In this case you would need an amplifier with Diff inputs or a converter to convert the head unit's outputs to SE
DAmoreEngineering, Sorry for the late reply. Just saw this. Most head units with Diff outputs has a current limiting resistor so when it connected to a grounded input, there is no harm done. This is done for compatibility. It is true the level is then down 6db which is the proper level for most unbalanced inputs.
Any chance you know what it would be considered if I'm going from an IPhone Lightening connector to RCA converter back to a BOSS car amplifier (pf1800)?
Hello i have a weird problem. I have 3 Jvc ks ax6500 and they all work.
And after measuring the positive and negative input to ground the value is 10Kohm on all 4 channels
But from 1 rca negative to the other 3 rca negative it's 0 ohms, is this a problem?
Can you post a video on How to determine if a amp is a single ended or differential?
+Nikko Civic Open the manual and read it.
So, what is Kimber PBJ? It looks like twisted pair (braided, actually). No shield. But it's not called out as specifically single-ended or differential. It sounds the same as my Blue Jeans LC-1. I guess I always assumed that all RCA cable is single-ended.
Twisted or braided will be differential, shielded will be single or coaxial.
Thanks Mr. D'Amore for the quality information. Always good to hear it from a quality engineer rather than from someone who thinks they know what they are talking about. Love all the new product you are developing and can't wait to see more.
How to understand which amlifire what kind of type is ? I checked several manuals during the video and did not get any information.
I was so waiting for him to write on the wall on accident.
What kind of equipment uses RCA connectors for differential signals? I notice this video offers no context at all in this regard. Working in pro-audio my whole life, I never encountered RCA connectors being used for differential signals, and doing so would prevent differential with shielding. But maybe this video isn't even about audio signals.....some context would be useful.
You may have had experience with this but when running RCA cables close to cabling for light clusters induces noise, for example in my case the loom is down the left hand side of an E90 and following the factory loom which are basically the cables going to the light cluster down the left hand side down to where the factory amplifier normally is, when you put your foot on the brake static noise can be heard. I want to keep my RCA run tidy with the factory cabling but have found it to be problematic in that it picks up EMI whenever I put my foot on the brake. I have verified this when disconnecting the plug that runs to the rear light cluster and the noise is no longer there. The cabling is the 6 channel Stinger 4000 series. I have tried other cables but to no avail. Running it down the centre console works better but I have found it to be untidy for cable management. The headunit is an aftermarket 80prs, so it’s a straight RCA run from the headunit to the amp. The amplifier is a class D five channel JBL GTR 7535.
What about if the amplifier has a feedback loop from the negative input to the output?
Really great information, just a small suggestion though. If you put this comment in the description that would be great for later use in case it is not on top when someone tries to go back to see this video.
Thanks for the awesome information!
I did not experience any difference in quality or performance on my Audison LRX 1.1k with cheap and expensive RCA cables, tried both of these types as well. Marketing crap.
The issue with Differential Input Cable doesn't surprise me. Monster Cable had manufactured these since the 1990's with Interlink 300 & 400 Series. There are White Stickers with Arrows denoting the Signal Flow which plugs into the source.
I've been looking for a decent explanation on RCAs and how to wire them up for different scenarios for awhile. Although this isn't exactly that Tony's explanation combined with knowledge I already learned just turned the light bulb on in my head! Lol
Didn't get how the noise is subtracted from the twisted-pair line...
I believe it works on the principle of phase cancellation. Same concept as extracting acapellas from music
Mr Damore, are you able to show us how one sounds compared to the other if you use the wrong one? I know you are busy, but I really would appreciate it! Or maybe anyone else has a link to a video like that? Thank you! -iMickey503-PDX
Testing both of my amplifiers, a 4 channel Pioneer and a mono Kicker, I got roughly 17k ohms on the Pioneer, and roughly 6-30m ohms on the Kicker. The Kicker amplifier specifies that it's a differential model, while the Pioneer doesn't mention anything about the type of input it uses. So I am going to assume that the Pioneer is a single ended based off of the lower resistance shown vs the known differential resistance shown on the Kicker. I hope I am correct in my assumption!
Nice refresher course. Thanks!
cool video thanks. Personally, I'm not a fan of RCA connectors to begin with, and think its old technology. But sometimes, that's all you get, and why I feel the whole car audio industry is behind the times, with little (no?) innovation in the last 20 years.
Here is a good question. What is the source is different from the amplifier?
I have got 2 question. How can i know if cable is balanced or unbalanced if i look at it or any other way to find out.? 2. If my amp has balanced rca input and i have got balanced rca cable do i need also headunit or any other source wirh balanced rca output?
Wouldn't this require a HU with differential outputs? Otherwise, how would would the sine waves become inverted to one another across the twisted pairs to begin with? Seems to me that the wire that goes to the sleeve on a twisted pair rca would not carry a wave at all if the HU has 'single ended' outputs, as it were. From what i see after a google search, HUs with differential outs are a unicorn, only a few boutique models have ever had them.
Thank you. but i am not sure i understand how to tell if the amp is single ended: should it have no resistance between the rca input and the ground ? i think you mentioned it should have 1000 ohm or less ?
This video needs to spread!
Hi, recently bought an audiolab 8300cdq and Audiolab 8300XP. Reading through the manual it make no mention of SE or DI RCA connection. I dont have an Ohm meter so is there another way to tell?
I’m trying to figure out if my amplifiers are differential or single ended. Mosconi as100.4 measured approximately 1100 ohms. The amplifiers are measured that are differential are like in the 10 thousand plus ohms readings.
To be more understandable, differential input means balanced type cable, more often come in XLR form (Usually Starquad structure). Single ended not necessarily in coaxial, but more often in RCA type. Unbalanced RCA may consist 2 or more cores of wire in TRS cable.
I have big questions. Please. My HU is a Pioneer DEH-80PRS. From what is available online I have found that this might be a "single ended" RCA preout head unit. If I use twisted/ balanced RCA cables to an amplifier that is ALSO "single ended," what could happen? Is there any loss or risk? Any gain? Any chance of damage?? Also, my DMM says 1166 on the ohm reading when connecting the positive lead to the RCA Input outer ring and the negative lead to the ground on the disconnected/ unpowered amp model amp PX1900.4 Massive. Does this mean the amp is "single ended?" Or "differential?"
There is a question that I've been wanting to get answered. If I measure a balanced car audio signal with a digital multimeter and get 8 volts reading would that become 4 volts going into an unbalanced RCA input at an amplifier? That would seem to be the case because the inverted signal or basically half the voltage is getting grounded at The amp anyways so the voltage will be cut in half right?
If it’s twisted pair do they usually list that somewhere on the rescue we it would you always have to probe the RCA jack?
Is it okay to use a twisted cable on a single-ended input? You said it is bad if you use a coaxial RCA cable on a differential input, but I did not hear (or maybe I missed it) you say if you used twisted cable on a single-ended input.
Isn't twisted pair gonna reject common mode noise regardless of input connection if the amp and a signal source are not physicaly grounded?
How does the end consumer know which one to use? How would the end consumer know what kind of outputs the head unit has and what kind of inputs the amp has?
So the higher end amplifiers you're referring here are class A and AB?
Mind Blown.... I really thought RCA's only differed in quality of the material and marketing :)
This probably explains why I had noise I could never find and I was running Stinger 4000 rca from my Audio Control LC2i to my amps. Probably needed regular RCAs and not twisted pairs and I was a victim of just thinking they were better newer technology.
My crossover is single. Would it matter using the double from my head unit to the crossover before it gets to the amps? Only reason I ask is because I just got my expensive twisted rca in today. Wish I saw this video a week ago.
For those balanced headphones connections, does it make any difference which type of wire I use? Thanks!
Why does car audio use rca and home audio uses better sounding cables like hdmi?
excellent explanation, thank you very much.
okay so if i get my meter and check for continuity from the amps ground to the shell of the rca coming out of the amp it should beep that means single coax rca and if no beep its twisted pair? is there a way to tell if you need twisted pair? if i was just looking to see if i need it
I'm using DI in my Polk audio amp since November and I haven't had a problem but I'm curious what's the side affect because I didn't understand that much in the video
Does your source unit have any effect on what cables will work best?
Per JL website: "JL Audio’s Differential-Balanced Input circuits" ... "This works equally well with differential-balanced, or unbalanced signal sources, making this input architecture compatible with all standard car and marine audio equipment, using standard, unshielded, twisted-pair RCA cables. No special cables are required, unlike the fully balanced connections used in professional audio" (jlaudio.zendesk.com/hc/en-us/articles/209357588-Differential-Balanced-Inputs).
----So which are you exactly referring to? Any specific amp for example?
Why is this not mentioned anywhere ever? This 8 year old video has explained why swapping around RCA's has cured noise in some of my systems when the RCA's themselves had no faults... awesome.
Can be used the component video cable as a RCA audio cable?If not why?
Could fiberglass or internal mirror light conduits help better with future further use?
Can you elaborate on the difference between commercially marketed “single-ended RCA interconnects” and “coaxial cables”, if any?
Hey Anthony,
another question:
would it be the best of both worlds if use a shieded twisted pair, like a CAT6 STP cable and ground the shield?
thanks and regards,
Dieter
Great info Tony!
@DAmoreEngineering, Great explanation. Tony, can you also discuss RCA outputs in relation to what you discussed about RCA inputs? Thanks.
This works 100%, I personally experienced this a few days ago. Has a pair of twisted high quality stinger rca's that were introducing noise, and after replacing them with a $5 junk pair of Aerpro coaxial rca's every bit of noise/whine disappeared.
So in a way coax is passive noise cancellation, and twisted is active cancellation?
Wish I knew all this in the 90’s when I was just a high school kid getting into car audio.
What's the difference between Differential Input signal system and a Balanced signal system (like an XLR cable) ? I'm guessing DI inversion occurs in the amp (receiving end) and Balanced inversion occurs at the source (transmitting end). Correct me where I'm wrong.
We already have a standard for differential signaling over a balanced line: AES14. AES14 uses XLR or TRS connectors, not RCA.
Car audio has been using differential signals via RCA since the 1980s
Hey Anthony,
nice video!
I have a question:
I use a Marantz AV7005, which offers XLR out (not sure if balanced) and 9 surround channels run on cheap TDA7492 chip, which has differential inputs. No ground to - , signal passes through 2 op amps before being amplified.
The 2 main front channels comes from the Marantz and go to a 845 SET power amplifier. This has the input - grounded.
Here comes the question:
Knowing that I can get balanced and unbalanced outputs, which cable type should I use where?
Thanks and regards,
Dieter
Does this mean that you need to know what outputs your head unit has? if the output rca from the head unit is the SE style, then the outer jacket of the rca which would be ground would not work for a DI style cable... could you please elaborate on that point? Thanks.
Which rca to use if the amps need twisted pair (Taramps) and the head unit and eq needs coaxial (Sony head unit, Rockford 360)
Interested as well in what to do in such cases where there's a mismatch...
Would this mix up of RCA on an amplifier cause some scratchiness or quite white noise effect? I'm not talking about alternator whine or something like a ground loop whine, but I mean just the different cable causing noise.
Hmmm. The twisted pair interconnect won't give common-mode rejection if it's used in an UNbalanced system.. I know of no balanced system that uses a phono (RCA) configuration (perhsps there are).. Also, a slight error in presentation (if I heard you correctly). The common noise that comes in off the cable is NOT "out of phase" and thus cancels at the input.. Rather, common mode noise is IN phase and presents the same voltage at the inputs. The amplifier senses the "difference" at the inputs.. Because the amplifier sees the "equal" in phase voltages at the input, the noise is not amplified....
i just bought an Alpine PDX-v9 5 channel amplifier. I want the best cables for this amp. should i use a twisted wire rca? I want the best conduction of sound. i was thinking about using 12 guage speaker wire for the mids and highs. what do you think?
if I twist my rcas around like while they are plugged in it makes more noise .. would that mean its coming from rcas? or could be other things?
Kindof a dumb question but google searches didn't come up with anything. when testing resistance of rca cables is it bad if white to white is at .5 ohms and black to black is around 1 ohm. FYI resistance doesn't change while wiggling the cords
+robert stobo Hi. No it's not. For what you measure is the resistance on your ohmmeter or multimeters cable. Try it out and just connect the two test probes of your MM together; some multimeters will show some resistance here. Your cables resistance is so low, that your ohmmeter has troubles measuring it . Think of measuring the thickness of a sheet of paper with a folding ruler!
Realistically, in 2019, how common are single-ended inputs on car amplifiers?
Really enlightening!
Glad you enjoyed
Thats all well and good.. but how does a person figure out which rca is right for their amp
Now I know......Thanks
I love it when smart people talk..lol
I now need to find out if my PDX's have a single ended input.
It is inexplicable why amplifier manufacturers don't advise the type of RCA connector that works better - unless of course it makes no difference. I have both types and have never* heard the slightest difference when connecting all these permutations: (1) Sources: Phono stages, CD and SACD disc spinners, Radio, Computer soundcard, DAC: into (2) various pre-amplifiers and integrated amplifiers; (3) between computer and DAC; (4) between Turntable and (4.1) phono stage (4.2) SUT (4.3) Head Amp (4.4) pre-amp.
Another point. The DI can have a shield. It can be floating (ie not connected to either of the 'return' connections on the RCA, it can be connected to both (I think this is best), or it can be connected to one end only - usually the source end.
*Unshielded connectors have sounded poor when run in close proximity to a power amp or TV.
Another vid including 'balanced' connectors may help.
They do, If it says they support CMRR then your good to go.
Thanks, without seeing this I am still in the dark because I did not use coxial cable before with open inside wiring.
Most noise picked up by RCA cable is 60 hz line and high power radio
Being an average car is mostly metal on the outside it becomes a Faraday cage and blocks most interference before it can get to your cables
Also proper routing of cables keeps the noise generated by the vehicle at a minimum
So I only have one set of outputs on my head unit. IRunnin 2 amps, so I gotta split em. I only have a pair of twisted wire splitters for my 2 shielded rca cables to go to amps. They are both single ended amps. Will that do ok to run permanently? Or will that cause some unwanted effect??
You will be fine
Great presentation!
Is that noise you talked about the buzzing noise i heard in my old sound system?
Ya, except that in car audio, almost every aftermarket HU does not use balanced or differential pre-amp outs. All of the speaker outputs are balanced/differential. So, if a RF P600X4, for example, with balanced-differential inputs, then I presume you can use either type of RCA, but twisted would be better; however, because the HU pre-amp outs are not balanced-differential, it does nothing.
-- I just saw this vid again today. There's twisted pair RCAs that have single and even double shielding. In that case, one could use such cables on an amp that has a grounded outer ring.
Interesting video.
I think I have a differential amp.
I have always been told to stay clear of unshielded twisted cables.
When playing from a digital source with my shielded cables I have 0 noise when playing from my phono preamp I have lots of interference.
So if I do have a diffential amp (cyrus 8)
Would the twisted cable eliminate this noise?
I get more confused every day😂
What is my kicker kxa400.1. I wonder if even tech-support Would know if I called them