Digital Room & Speaker Correction Workshop
HTML-код
- Опубликовано: 3 авг 2024
- In this video tutorial, we will delve deep into the world of digital room correction and unveil ingenious methods that promise to transform the way you perceive sound in your listening space. With the comprehensive guide, we'll not only cover basics of a stereo system set up but also cover every aspect of speaker placement, room measurement and cutting-edge filter creation techniques to achieve audiophile grade high fidelity sound in your home set up ensuring you have a complete understanding of how it all works.
Video resolution: 2,160 x 1440 (60fps)
Timeline:
00:00:00 Introduction
00:00:41 Tutorial content
00:01:12 Building a stereo system
00:06:45 Speaker placement
00:12:18 Measuring the room correctly
00:14:38 Speaker box and crossover phase correction
00:37:28 Virtual Bass Array filter
00:38:27 The effects of the first two filters
Links referred to in the video:
Amp/Speaker/Room matching German reference paper:
drive.google.com/file/d/1Bywf...
Room reflection geometry calculation paper:
drive.google.com/file/d/1ZUUi...
Excel first reflections calculator tool:
docs.google.com/spreadsheets/...
VBA tutorial video:
• Boost your bass output...
REW version used in the video:
www.avnirvana.com/threads/v5-...
#roon "room eq wizard" "filter design" "phase inversion" #audiophile #impulseresponse #convolution #filters #rew #roomcorrection #calibration #fouriertransform #fourier #equalization #equalizer #hometheater #cinemasound #soundsystem #dirac #dolbyatmos #speakertest #impulse #phase #hifi #hifiaudio #bass #bassboost #graphicequalizer #hometheater #impulse #iir #fir #lowpassfilter #phase #rephase #sota #viral #audio #rew “speaker placement” “speaker matching” “speaker impedance” “double bass array” #subwoofer “subwoofer placement” “phase correction” “crossover” "speaker port measurement" #systemdesign #systemtuning #livesound #liveaudio #sounddesign #audioengineering #soundoptimization #liveaudio #concertsound #audiomath #systemtuning #proaudio #soundengineering #soundtech #sounddesigner 
Наука
![[BLACKSWAN] ‘Roll Up’ Official Music Video](http://i.ytimg.com/vi/ulvCwyKrwqw/mqdefault.jpg)
Hey OCA, I just today discovered your channel and I'm very impressed by your expertise. Right know I'm in the middle of designing my new home-theater and wondering, if I could book you for teaching me how to optimize my setup with the options that I have at hand. Anyway keep doing what you are doing : ) And thank you very much.
Thanks. I can direct you to the correct tutorials or forums if you give some specifics
@@ocaudiophile I know the basics of REW and also have expirence with MSO (Multi Sub Optimizer)and a miniDSP 2x4HD. I also got MultEQ-X and watching Movies in Atmos, DTSX and Auro a lot. So I want to know how to make the best use of the features of MultEQ-X in combination with REW and MSO for Music and Films. In a nutshell. But I have to watch all your videos first to be more precise. I think the main problem could be, that I can only use FIR at the software side right now which means it doesn't work with Atmos and so on and has a huge delay. But I will try to make it work for music first.
@@ocaudiophile Some edit to my last post and some clarification: I use Auro3D up-mixing 95% of the time when watching films or listening to music. So before I get separate amplifiers for my 8500HA I can not integrate external DSP and therefor can not access the height layer output for filtering except through MultEQ-X, I think. Also because of the up-mixing I can not use software DSP for the floor layer because it would also effect the height layer, I think. So in conclusion I can only use my AVR options and MultEQ-X and I will watch Supreme Audyssey Calibration by OCA next.
I've made REW sweeps for Atmos channels, you'll find them in all Audyssey videos so measuring height channels is not a problem. However, you're limited to GEQ in the Denon for correction. The only way to use FIR filters is to hack Audyssey through the Multeq editor app.
@@ocaudiophile How do we play the Atmos channel sweeps into the processor?
Hi All, OCA makes a valid point to spend time on the placement of the loudspeakers, especially with toe-in values. Its really difficult to accurately measure an angle of the toe -in to the LP, that I have used the Apple iPhone compass app. By taking a degree measurement of the front facing wall and then placing the phone on the speaker front edge can then add or subtract the angle of the speaker very accurately. I find I get both the speakers with equal toe-in. Once you can do this easily, then experimenting with the audio tracks mentioned (9:45) to find the optimum toe-in for your speaker and the distance well worth the effort.
I believe the more accurate the placement from walls, toe-in and LP distance the less work the DSP has to do and a better result you make end up with.
One word of advice. Preserve with your experimentation, re-listen to the video, take more measurement readings and select the averages.
Don't give up. Although OCA does say it should not take long to perform the measurements, you will always get something not quite right. So do it all again.
If you follow the instructions, and double check your results, at the end you will have something only very few "audiophiles" have near perfect reproduction.
OCA has put so much of his time to give us this economical opportunity to get the best from whatever equipment we have, we owe it to him to be a good pupil and get top marks. (Insert large smiley face here)
Thank you 🤗💕
I’m so really happy with results 🤗
My search for best sound ended with you 🤗
Thank you so much 😊😊😊🔊🔊🔊
Best regards from Norway 🇳🇴🤗
You're welcome 😊
Hi.. OCA another powerful videos.. thank you again. We are waiting to see if you can do one video with Monolith or any other Dirac receiver. We believe REW a more powerful tuning than any other autocalibration.❤
Great suggestion!
Hi OCA, have been following your content for the past few months and they have been very educational, albeit a bit technical for newbies. I have been trying to digitally correct my 3-way speakers for the past 5 years and couldn't get any completely satisfied results. This is likely due to my poor understanding of the subject matter.
I will purchase a Minidsp flex 8, delay the purchase of Dirac Live and attempt to re-learn/re-correct using your methods and tutorials, starting with this workshop vid.
Thank you sir for posting all these very informative tutorial vids.
Your welcome!
Grazie.
Cheers!
These videos are great! The one request I have is for you to test these filters yourself on your system. It shouldn’t take long and would be very useful to see how the predicted outcome compares to the actual measurements post-application.
They're of course all tested in my system along with a number of other systems. The reason I don't remeasure with the filters active is because they're identical to calculations and time is limited in a video.
I'm hoping to post part II of that video with all filters completed later today and I can of course share a link to the actual mdat file in its description.
Hi OCA, I enjoy your videos very much. Thanks for all the hard work!
I have a small question regarding some inconsistency between the way your perform the measurements and what is stated on REW's website.
In this video you run multiple measurements with a USB mic as input and a DAC as an output. and the REW states the following:
"REW allows multiple sweeps to be averaged, although best results are generally obtained by using single, longer sweeps rather than multiple, shorter sweeps. Multiple sweeps are offered when not using a Timing reference or when using a loopback as a timing reference. Do not use multiple sweeps if the input and output are on different devices (for example, if the input is a USB mic). If Repetitions is more than 1 REW uses synchronous pre-averaging, capturing the selected number of sweeps per measurement and averaging the results to reduce the effects of noise and interference. The pre-averaging can improve S/N by almost 3 dB for each doubling of the number of sweeps. Averaging can be useful if the measurements are contaminated by interference tones, whether electrical or acoustic, as they typically will not add coherently in the averaging and hence will be suppressed by the process."
- www.roomeqwizard.com/help/help_en-GB/html/makingmeasurements.htm
can you please shine some light on the topic?
Thanks a lot!
I couldn't get the link above opened but multiple sweeps mentioned there must be for RTA or multiple mic measurements. REW doesn't average regular measurements on its own but gives user a lot of averaging options instead. Longer and louder sweeps will always have better signal to noise ratio but they will still benefit from repeating and averaging.
Thank you so much for this. I've just started using REW and measuring my room and needed a proper explanation on how to generate filters.
I saw both parts of the series, would you say that all filters are necessary, if not, which are the most critical?
My system is in a dedicated room, with room treatments (corner bass traps, panels on side and rear walls), so should have a good starting point.
VBA wouldn't work well in treated rooms in my experience with viewer data so you can skip that. Sort 20-200Hz out and add a xo phase linearization and I guess you'll get 90% there.
OCA, thanks for sharing you knowledge and findings! The community enjoying the sound improvements!
Question, in previous videos you've recommended 1M Sweep Lengths. Is the new standard 128k Sweep Lengths with multiple measurement with cross corr align? If so, I would also assume this would apply to previous videos to take base measurements?
128k for phase/time alignment related measurements, longer for frequency resolution and SNR
@@ocaudiophile - Got it! Thanks!
Awesome Information! Quick question, any suggestions for a diy active setup. Is it better to start with speaker calibration and then room correction?
Thanks but I have very limited knowledge with DIY speakers. Check diyaudio website on that. You should take your room size, room reflectivity and wall proximity into consideration to decide what kind of speaker to design though. Room correction is the final touch.
Awesome video much appreciated!
Few questions though...
What would be ticked in REW - Analysis - Impulse response calculations....
... if you're using a soundcard and XLR mic ? (I've calibrated my soundcard and correction files for mic)
Should I tick...
Loopback delay reference is IR peak?
And
Adjust clock with loopback reference?
Loopback is the most accurate reference but needs a sound card or audio interface with two inputs and one of the inputs should be connected to the output of the playing device. You can find some useful instructions here :
www.avnirvana.com/threads/rew-loopback-connection-setup.9967/
Hi, great tutorial!
Is it possible to use 20 - 24 000 Hz measurements instead, some sort of imputation maybe?
My amplifier goes into protection mode for a few seconds at the end of each impulse which corrupts the sweep start, especially for sweeps above 70 dB and longer than 1M. When starting at 20 Hz I can measure at significantly higher dB.
Yes you can!
Hi, @ocaudiophile, I really like your tutorials!
But how should we use properly rephase for phase alignment if the speakers have first order crossovers?
Like most Dynaudio models for example...
It will be complicated :)
copy everything after this sentence and "paste from clipboard" to rePhase:
rePhase settings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and?
Really fantastic information. I cannot work with FIR at the moment. I play with different systems which only provide PEQ. Does it make sense to produce minimum phase responses before applying REWs PEQ filter calculations? Or - as another idea - is there a way to follow your method and calculate best possible PEQ-filters from your FIR-filters. That would be really interesting. Additionally, applying DSP to cheaper and older systems (cheap amp, old speakers) often require some more DSPing in the upper frequencies (often to bright relative to basse). I receive good results but loose a lot of headroom and sometimes the corrections are as high as 8db.
Just as a note: In my main system, I use better hardware (a Lyngdorf TDAI-2170 amp, Harbeth P3ESR XDs and 2 Aperion Bravus 12 subs).
I am always looking forward to your videos. Certainly some steps beyond most of the measuring and EQing advice I found elsewhere 👍🏻
REW'S PEQ works even better on the MP response so long as you stay below Schroeder's. There are now shelving filters as well on the latest beta.
@@ocaudiophile First of all, sorry. I wanted to post under your new video. Thanks for the quick reply. I will use the MP-Versions of my measurements. I can generate Schroeder's in REW in "RT60 Decay" with with "Calculate RT60 model", right. Schroeder is T60M 1/1, correct? I am not sure what you mean with "stay below Schroeder". What do I have to look for? And what would be conditions where I should not use MP-Versions of my measurements? Have a great weekend
Bidjan
@bixite I only meant not to correct for above 200Hz. You dont need your rooms exact Schroeder's freq.
Hey OCA, thanks for another great tutorial 👍 This is the first time I do the rePhase part and I'm a bit confused with my Fyne Audio F502SP corssover type.
The spec says:
Crossover frequency 250Hz & 1.7kHz
Crossover type Bi-wired passive low loss, 2nd order low pass, 1st order high pass
To be honest - I have no idea what crossover order type I should choose and whether to invert the phase or not :/ Could you pls point me in the right direction?
ENter the XO frequencies in the filter linearization tab of rePhasde and check which order flattens the response. Start from the higher XO frequency (1700Hz in your case).
Sounds great! Did notmwatxh the video yet, but can this also be applied to surround sound systems?
There's a lot of information in the video about sound but mostly for stereo systems. An Audyssey wrap up video is on the pipeline though.
@@ocaudiophile awesome, looking forward to that!
@@StuggiSuzi 👍
@@ocaudiophile I'm looking forward to that one, too :)
@@ocaudiophile I am looking forward too... :)
Great tutorial and video as always. Just a confirmation question. Do you really mean to say that the starting TV conversation in Roger Waters’ Amused to Death should seem like it is coming from the Rear Left of the LP? For my setup it seems to be coming from the Front Left speaker. Thanks !
Yes I mean it
@@ocaudiophile oh wow! That means I still have a lot of work to do with my speaker placement. In my case the left side wall is closer to the Front Left speaker than the right side wall, as in, the whole setup is towards the left side of my room. Is it possible that the two speakers have different toe in angles to achieve the best possible soundstage ?
@@paulsoumya No, the speaker distances to the side walls should also be equal
@@ocaudiophile In my case it is impossible for me to achieve this as it is my living room with a kitchen on one side of the room ( typical modern European small apartment). That’s why I was asking if it is possible that when the sweet spot of the soundstage has been achieved, the two speakers have different toe in angles to the LP.
If you managed to achieve a cehtral sound stage with different toe in angles, I guess you can keep it that way.
Hi OCA I'm starting to apply phase correction to my Polk R700 which by specs have 350hz and 2700hz XOs and a port peak at about 35Hz extracted from a review from Audioholics. I didn't inverted the signal on RePhase since I noted that thry where nearer to zero without inversion. But when I compared impulse response on REW after applying the filter I noted filtered response is much better but inverted. Is this posible to happen ? or is sign that I have to invert the signal on RePhase. Also I noted that in my case I got a zero at about 375Hz instead of the 350Hz of the specs I could asume that the real crossover is on 375Hz due 5-10% tolerances of passive components of the XO ? Many thanks for your videos.
Inverted impulse peak after phase correction is expected. Stick with spec xo frequencies.👍
I think your work makes REW a lot more popular. Taking off my hat!
For me, there is a problem in understanding the methodology and following your algorithm because:
- I'm not native English
- you speak fast and move your mouse even faster :)
To somehow cope with this, I make my outline step by step with screenshots. In order not to miss anything, I make a start-stop of your video almost every second. Video length is not a problem. The problem is not losing accuracy.
And I have a question. My acoustics is Dynadio 40 Shecial. According to information from the network, it has a first-order crossover of 6dB. But rePhase has a minimum of 12. Do you have any ideas how to get around this limitation?
You can create an 18dB/oct phase filter with a time and polarity inverted 1st order AllPass but there's no way in rePhase to produce a 6dB/oct filter. I guess Tom thought any crossover filter will have a minimum of a capacitor and an inductor which is 2nd order already.
Hmm.. I made screenshots of my acoustics. Take a look, you might be interested. The crossover has both a coil and capacitors, but it is claimed to be of the first order. Or am I misunderstanding something.
drive.google.com/file/d/1pck6b65ZLdK62RJV77jKRvQOFf7FKa2W/view?usp=sharing
Well, if Dynaudio says so I will have to agree ;)
I am also pleased with the resourcefulness of Dynaudio engineers. But I'm sorry that I can't use rePhase to box correction my acoustics. I liked how you experimentally selected the best parameters.
Did I understand correctly that your recommendation above refers me to REW in the EQ section? Is this also some kind of experiment?
OCA, in one video you said that the method is difficult because there is a high chance of human error. For me, this is 100 percent true. But I'll be persistent because I like the level of this solution - instead of post-removal of acoustic-room interaction by amplitude correction, you develop a FIR-based method that eliminates the very nature of the problem. Beautiful solution, almost perfect!
Chances are you are not a pioneer. But you have done a very great job. With thanks!
Hi, I have a little different question and I'm not sure how you feel about car audio (stereo) taking into account you car audio video ;-). But would you recommend to go MiniDSP route to have a chance of using FIR/rePhase or go with car-specific DSP like Helix and only use REW?
I wasn't able to apply DSP in any car so far as most cars these days already come with factory installed systems with no user input allowed. I would go with something like MiniDSP OpenDRC-DI (if you can find one) as it's the only one with adequate FIR filter taps count (I think 6128 taps/channel) to be able to apply any meaningful correction to bass frequencies. I am not sure but I don't think Helix allows FIR filters like most others which will only allow PEQ (IIR filters) and no phase correction will be possible.
@@ocaudiophile Thanks for the answer. OpenDRC-DI will be hard to find where I live. I was considering C-DSP 8x12 v2, but I'm not sure how many taps it can handle. Right now I'm thinking on using normal car DSP and RPi with CamillaDSP, we'll see what I will manage to achieve with that...
I see...If Rpi can work in a car, there're almost no limits to what can be done with Camilla!@@adrianbeacon6421
I'm trying to figure out which steps are necessary for me with my gear. My setup is a bedroom studio with yamaha hs5 active monitors and an 8 inch ported active sub. I have a umik-1 and minidsp 2x4 hd. I'm pretty comfortable with req and have a base level knowledge of much of this but am having trouble with where to start based on what I'm using. I just want to get back to mixing!
This procedure will give the best results with the equipment you have:
1. Measure each speaker and the sub separately with REW+Umik using acoustic timing reference (should be the same speaker for all measurements) and clock adjustment with acoustic reference.
2. Time align both speakers and the sub at the LP and crossover speakers around their spec bass roll off frequency and dial these settings in the MiniDSP
3. Re-measure left and right speaker this time with the sub active and crossed over.
4. In REW EQ select MiniDSP and 2x4HD, upload a house curve (I'd recoomend Dr Toole's curve- you can find that in most of my video description links), "Match target to response", and "Match response to target" with settings 20Hz-200Hz, 0dB boost, Allow narrow filters below 200Hz ticked. "Export filter settings" which will generate biquad filters (a1,b1,....) which you can directly upload to MiniDSP.
5. Optionally, you can create crossover phase correction filters in rePhase for your particular speakers, save them with 1024 taps, 96KHz, .bin format and use that filter in MiniDSP FIR. Even with 1024 taps, you could still apply descent high frequency crossover phase correction.
PS If you use your PC as the convolution engine, you could do better by using high taps of full FIR filters.
@@ocaudiophileThank you so much for the quick response.
A few clarifying questions:
My speakers min freq is said to be 54hz, so I should set the crossover in minidsp to lowpass the sub and high pass the speakers with 24db/oct falloff?
When I export the settings for the minidsp as you describe in step 4, these are for peq not fir?
And then for step 5, I started to follow your tutorial for phase correction but got a bit lost. If I understand correctly I need to use the minimum phase cal file for umik to take measurements of each speaker, import those into rephase and then apply phase correction. Since the speakers are active though, is the crossover phase correction you're referring to for the crossover between sub and speakers?
Once again thanks for what you're doing I truly appreciate your dedication to this sort of stuff.
Yes, Linkwitz-Riley filetrs with 24dB/octave roll off around 50-60Hz is a good starting point but feel free to test other roll offs and filters.
Yes, biquads are IIR filters (you can also do allpass filters with biquads and I have a MiniDSP video on that but time-reversed all-pass which you need for phase linearization is not possible with 2x4HD)
Most active speakers still need some phase linearization especially for box and port (these are too low frequency for 1024 taps though but no harm in checking). I think, you can use "Merge cal file to IR" in REW to embed the min phase mic cal file to old measurements.
Hey OCA! I am sure you know about Dirac's Active Room Treatment technology. How do you think, are there any chances that this technique can be replicated by free tools?
The technique (although not yet officially disclosed publicly) is very similar in principle to the one in the VBA filter. But it uses other speakers in the multichannel system to create the counteracting sound wave. It could be done with an HTPC as the source for encoding surround sound and processing filters but no AVR as the source allows the user to access such features and also unlikely in the near future.
Hi OCA，While making speaker box and crossover phase correction, we need the crossover frequency in our speakers. It's a bit frustrating that I can't find the frequency response , and even the official customer service says they have no info about it . The second way is in near-field measurements. However, my speakers don't have ports, it's Variovent. How should I proceed? Thanks a lot, again.
Good thing is sealed boxes have relatively flat bass phase responses unlike ported ones. You can measure close to the woofer center.
@@ocaudiophile I'm not entirely sure, but based on measurement, would the crossover for my three-way and four-driver speaker possibly be 400Hz and 2600Hz? (2600Hz - LR 24 db/oct, 400Hz - LR 12 db/oct) Thanks!
drive.google.com/file/d/1WRcfyMxDaxlGJctDBkMWWPBqhgMzafaD/view?usp=sharing
Difficult to see from the frequency response measurements. The volume levels of drivers will need to be adjusted to see the intersection frequencies. Phase graphs give more information. Woofer's polarity is inverted. I would say (with a wild guess) XO frequencies are 145Hz and 1150Hz. Filters orders can be found by trying different combinations in rephase using those frequencies.
@@ocaudiophile You mean that each driver measurement needs to be adjusted to the same volume level ? Or what should I measure correctly? If possible, I would like to re-measure it for you to check.Thanks again!
I am not aware of an optimal method. I had seen articles on correctly stitching driver measurements but couldn't find one just now, check DIY forums.@@WallaceChen
Do you have a video on subwoofer integration?
It's a bit dated but the method is still optimal:
ruclips.net/video/ga2eOwJRtXo/видео.htmlsi=QxfM-3Jvh4dDXgpD
There's one for aligning subs between each other.
I have a question about using rePhase with MiniDSP - In the manual for the Flex (which is the model I have) it says: "The miniDSP Flex can compute a total of 4096 taps. These taps can be distributed as you wish across the four output channels, with the limitation that each output channel must have 6 or more taps and can have no more than 2048 taps." - Does this mean I should use 2048 as the number in RePhase, and does this still mean I cannot use Box Correction?
Yes you can use 2048 tap fir filters. It should be enough for box correction if you use rectangular windowing and 99% or 100% centering.
@@ocaudiophile Okay, great - one more thing. According to the specs on my speakers, Crossover frequencies: 250Hz, 2.2kHz. Crossover slopes: 24dB/octave Linkwitz-Riley (midrange/tweeter), 18dB/octave (midrange/woofer) - I am unclear what that means for the crossover value setting on the 18db/octave mid/woofer in RePhase.
You can use "butt 18dB/oct" Subsonic filter @ 250Hz for a 3rd order crossover filter.
Hi OCA, I would be extremely grateful if you can make a tutorial on how to integrate stereo subs with stereo speakers. I am right now in the process doing the same using my miniDSP 2x4 HD and have watched almost all of your videos for inspiration. However, I seem to be getting extremely confused while carrying it out myself. Even a 3dB boost to my sub seems to mean that my crossover point with that main speaker changes... not to mention the time alignment, phase correction etc... Also with the miniDSP it seems like one cannot apply a negative delay, which is what I think is required for the subs since they arrive at the LP later than the main speakers. I try to achieve is by applying positive delay to the main speakers instead, to compensate for the subs. But if I apply different delays to the left and right speakers, the sound seems to be much louder on one than on the other. Moreover, the delay setting on the miniDSP does not seem to correspond to what REW is measuring... Many thanks in advance.
Minidsp has its own internal delsys hence the difference you see in REW and its delay capacity is somewhat limited but still it will do the job for a stereo system.
The reason I don't do that video is because I don't have subs in my stereo system and surround system subs have weaker bass than my floorstanders so there's no good data I can work on in a tutorial. Reset minidsp (all delays, filters, crossovers etc) and measure your subs and speakers one by one with REW and share here and I'll see what I can do. PS link needs to be google drive or else youtube will delete it!
@@ocaudiophile Thanks a lot. I Will do that as soon as I get to measuring them next. As a heads up, I have the Focal Aria 926 floor standers and dual Monolith THX 10 V1 subs each placed next to the Arias in symmetry. The subs dig really deep and hard and ideally should extend the bass of the speakers. I have followed your instructions on speaker placement and toe in and have them placed and toed in so that the album “Amused to death” sounds as convincing as I can have it in my room.
I'm good with focals, don't worry ;)
@@ocaudiophile Hi OCA. Here is the link to the measurements I made of my stereo speakers and stereo subs:
drive.google.com/drive/folders/1EUq-ezUezd63LqW1b3B1wgJKD-TLxLN7?usp=sharing
I disabled everything on the miniDSP and measured each sub and speaker separately. For the left sub I used the front left speaker as timing reference and for the right sub I used the front right. I took 3 repeated measurements for each type. The text file contains some info regarding my setup and also my room measurements. I have also included a couple of pics of my room. Please do not hesitate to ask if you need any further info. Once again, I thank you very much for the help.
How do you exactly connect speakers/crossovers/subs in MiniDSP? Do you have another DSP source for convolution (like a PC) or is it only MiniDSP?
rew does not recognize the acoustic time reference beep for my sub because its a high frequency noise what should i do ?
That's usually because of sample rate difference between input and output. Make sure everything is at 48kHz in Windows sound settings. Or switch to ASIO drivers.
@@ocaudiophile i dont have problem with the sweep itself , i have a problem with the acoustic time reference when measuring the sub because i have to turn off main speakers channel to measure only the sub .
If you connect your PC to the receiver with an HDMI cable and select LFE channel with REW Java EXCL drivers, the sweep will only go to subwoofer. You do not need to unplug your main speakers.@@Motymott99
@@ocaudiophile i am using mini dsp 2x4
not many speakers are using 24db filters. to expensive. even for 10K speakes
asio4all sucks for introducing a lot of latency. why don't you use the original asio comes from your dac/audio interface?
Noted
Hello, I have carried out step by step the measurements and generation of filters explained in ruclips.net/video/5YcH7j2-L1Y/видео.html.
The result is very good, when you look at the results of the response correction, but when listening to it I notice an absence of bass... is this correction less recommended than those suggested in Workshop 1 and 2? Thank you!
Yes, this is a simpler and quicker method but you can adjust bass strength with the target curve bass shape
Anyone have any idea how, in RePhase, to handle speaker designs like the Zu Dirty Weekend? They claim that their single driver is ‘cross less’ until 12khz, and the a special twitter takes over. Should this even count as a crossover in RePhase? And what about the portless~design? It speaker has slits that open to the floor, I’m not sure that those count as ports… Any insight appreciated. Thx.
You will need a phase linearization filter at 12kHz for sure. The bos is a bit too complicated to know in advance but with carefully time aligned multiple measurements, bass phase response canbe extracted and problems manually corrected.
Thank you! I'm a total newbie here, so will need to figure out what all that means (especially how to extract the bass phase response), but this is a good tip for a start. Thank you. @@ocaudiophile
ab min 28:50 funktioniert der deutsche Untertitel nicht mehr 😉
Danke für das Erinnern. Ich werde es so schnell wie möglich reparieren!