MB, I have been wanting to ask you about subwoofer placement. I notice that you place the two subs to one side and not one on each side. Is that for better accuracy for the port?
45:45 might sound crazy I can tell what frequency ball park by 2-3 hz used to be really good I used to use a program that told what peak frequency was and use that and if there was another 808 that was lower but not louder I'd mark that number in brackets on the file name so yea I would reference lows and know what's what
If what you’re saying is true about setting the gain below 40hz (I.e. at enclosure tuning frequency) causing clipping to occur at the higher frequencies then you must agree that setting the gain at 40hz ALSO causes clipping at higher frequencies. There is nothing magical about 40hz. I disagree with your statement about power diminishing as frequency goes lower. At least within the pass band of what the amplifier is supposed to reproduce (I.e. 20hz-20khz). Power is a function of Voltage squared over resistance. Assuming that voltage stays relatively constant from 20hz to 120hz on a subwoofer amplifier then the power output is determined by the impedance (resistance). A bass reflex enclosure has varying impedance values throughout the frequency range. Normally the lowest impedance value occurs at the tuning frequency and ALL other frequencies rise from there. So if the enclosure is tuned at 30 that will be the point where it will receive the most power. At 40hz it will be significantly less. My argument isn’t about finding the clipping point. That is function voltage and has no regard for the resistive load value. My argument is that the DD-1 CAN allow a user to send too much power to the driver when using it to MAXIMIZE the gain setting at what is typically the highest resistance level of an enclosure that is tuned in the 30’s.
Test it yourself…it doesn’t matter what frequency you use. Check the voltage at any frequency under where you set it originally and you will see the AC voltage(RMS OUTPUT) will be significant less the farther you go away from that setting. I set all my amps just like SMD does at 40hz, below that less power is being used. Fact.
@@M.B.Enclosures okay. So I did. Here are my results: Vehicle running, all filters off, eq flat Test tones played at same level on head unit and are all SMD CC1 tones 28hz 46.6v 4.9ohms 443 watts 31hz 49.2v 3.9ohms 620 watts 35hz 52.3v 5.5ohms 497 watts 40hz 53.9v 10.8ohms 269 watts 45hz 54.9v 15.3ohms 197 watts 50hz 56.4v 6.3ohms 513 watts 56hz 58.6v 4.0ohms 858 watts 63hz 59.9v 3.6ohms 997 watts 71hz 56.5v 3.4 ohms 939 watts As you can see there is a significant difference in power (watts) between 40hz and the enclosure tuning of 31 hz. 269 watts versus 620 watts.
I am going to watch the video after this live session. I can imagine how they sound, judging by your excitement
Good evening MB and Queen. Great to be back in class
Let's go already did fire video crazy flex
💯
MB, I have been wanting to ask you about subwoofer placement. I notice that you place the two subs to one side and not one on each side. Is that for better accuracy for the port?
45:45 might sound crazy I can tell what frequency ball park by 2-3 hz used to be really good I used to use a program that told what peak frequency was and use that and if there was another 808 that was lower but not louder I'd mark that number in brackets on the file name so yea I would reference lows and know what's what
What’s going MBE and the misses.
Alright hold up, I’ll be back in a minute
What is your favorite 8 inch subs for the vented box under the seat for trucks? Thanks
Very old question on this channel... digital design 2508 supercharged (godzilla)
DB Drive G7 (king kong)
☝🏿
@@anthonywashington9731 I'm a newbie to your channel. Thanks for the info. It is well appreciated. Have a great weekend.
If what you’re saying is true about setting the gain below 40hz (I.e. at enclosure tuning frequency) causing clipping to occur at the higher frequencies then you must agree that setting the gain at 40hz ALSO causes clipping at higher frequencies.
There is nothing magical about 40hz. I disagree with your statement about power diminishing as frequency goes lower. At least within the pass band of what the amplifier is supposed to reproduce (I.e. 20hz-20khz).
Power is a function of Voltage squared over resistance. Assuming that voltage stays relatively constant from 20hz to 120hz on a subwoofer amplifier then the power output is determined by the impedance (resistance). A bass reflex enclosure has varying impedance values throughout the frequency range. Normally the lowest impedance value occurs at the tuning frequency and ALL other frequencies rise from there.
So if the enclosure is tuned at 30 that will be the point where it will receive the most power. At 40hz it will be significantly less.
My argument isn’t about finding the clipping point. That is function voltage and has no regard for the resistive load value. My argument is that the DD-1 CAN allow a user to send too much power to the driver when using it to MAXIMIZE the gain setting at what is typically the highest resistance level of an enclosure that is tuned in the 30’s.
Test it yourself…it doesn’t matter what frequency you use. Check the voltage at any frequency under where you set it originally and you will see the AC voltage(RMS OUTPUT) will be significant less the farther you go away from that setting. I set all my amps just like SMD does at 40hz, below that less power is being used. Fact.
@@M.B.Enclosures okay. So I did. Here are my results:
Vehicle running, all filters off, eq flat
Test tones played at same level on head unit and are all SMD CC1 tones
28hz 46.6v 4.9ohms 443 watts
31hz 49.2v 3.9ohms 620 watts
35hz 52.3v 5.5ohms 497 watts
40hz 53.9v 10.8ohms 269 watts
45hz 54.9v 15.3ohms 197 watts
50hz 56.4v 6.3ohms 513 watts
56hz 58.6v 4.0ohms 858 watts
63hz 59.9v 3.6ohms 997 watts
71hz 56.5v 3.4 ohms 939 watts
As you can see there is a significant difference in power (watts) between 40hz and the enclosure tuning of 31 hz. 269 watts versus 620 watts.