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rePhase, a loudspeaker phase linearization, EQ and FIR filtering tool
rePhase, a loudspeaker phase linearization, EQ and FIR filtering tool
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Old 5th March 2018, 06:30 PM   #2471
pos is online now pos  Europe
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Quote:
Originally Posted by arcgotic View Post
1) @Pos, A few posts ago you said that the number of taps should be as few as possible, and that If target response is reached, it is OK. On other web pages (I don't saved them..) it is said that more taps is OK, because ripples in the impulse response become much flatter. I don't hear difference in sound. The best way to go is as little number of taps, correct?
There is no benefit in increasing the number of taps if the result is close enough to the target for your needs.
A reasonable number of taps is the good anwser, 1sec being a good target IMHO.
IR ripples will be the same regardless of its length: they will only be truncated (or windowed). So in sense a shorter FIR will in fact have less ripples

Quote:
2) The exported impulse response. If opened in REW > Import Impulse response. Should the impulse response spike be as close to ideal? Why I am asking. If I flatten the phase with Paragraphic Phase EQ, for the range the speaker will play, the impulse response looks much better in REW than the one created with Minimum Phase Box linearization. The question is, should I use the impulse response that looks good in REW? The measurement for that speaker is the same with either impulse response file used.
Not sure I understand correctly, but you don't need to import the FIR in REW. If you do, make sure the t=0 is handled correctly (same impulse delay as the one indicated by rephase).
If you are building an active crossover using FIR you should not need phase EQ at all.

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And 3) (just thought of it). My Asus card can play at 192khz sample rate. But 99% of my music is 44.1Khz. Now the sound in Windows is set at 192, and all impulse files are created at 192. Is it better to go to 44.1khz with audio, impulse then can have 4times less taps for the same response target? What would you do?
Thanks again!
If your soundcard can relatively play 44.1kHz then this is probably the best sample rate to choose, as you will avoid an SRC stage for 99% of your music. Also make sure you choose 24bit (or even 32 bits if that is available).

What convolution engine are you using?
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Old 5th March 2018, 06:57 PM   #2472
arcgotic is offline arcgotic  Romania
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Old 5th March 2018, 09:20 PM   #2473
BYRTT is online now BYRTT  Denmark
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rePhase, a loudspeaker phase linearization, EQ and FIR filtering tool
Quote:
Originally Posted by arcgotic View Post
...My Asus card can play at 192khz sample rate. But 99% of my music is 44.1Khz. Now the sound in Windows is set at 192, and all impulse files are created at 192. Is it better to go to 44.1khz with audio, impulse then can have 4times less taps for the same response target? What would you do?
Thanks again!
On a computer because we can is not always right and subject can probably be a can of worms but agree what pos suggest if your system lack solution to dynamic adjust material.

Although know subject is about reproduce chain distortion have this fun example from recording chain, its a famous hard rock band 96kHz high resolution release, serious 48kHz noise up there
rePhase, a loudspeaker phase linearization, EQ and FIR filtering tool-3005-png
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Old 10th March 2018, 11:11 AM   #2474
TNT is offline TNT  Sweden
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Did anyone by chance do filters for the DAM dac using rePhase? If so, would you like to share your process?

Thanks in advance!

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Old 10th March 2018, 08:31 PM   #2475
pos is online now pos  Europe
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IIRC the FIR filters in the DAM are running at very high sampling frequency and a relatively low number of taps, and are intended for antialiasing filtering purpose only.
By the way I think Soren used rephase to generate the default filters.

The DAM also includes biquads and that is the logical thing to look at to implement filters and EQs.
The deemphasis filter is implemented that way (I send Soren the coefficients for the improved version).

Last edited by pos; 10th March 2018 at 08:38 PM.
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Old 10th March 2018, 09:18 PM   #2476
TNT is offline TNT  Sweden
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Hi pos!

Yes, it is the biquads I would like to understand how to add.

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Old 11th March 2018, 08:55 PM   #2477
pos is online now pos  Europe
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rePhase will not help you there as it cannot output biquad coefficients.
I think there is a spreadsheet on the minidsp forum that could be useful for this.
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Old 23rd March 2018, 03:36 AM   #2478
nefilim is offline nefilim  United States
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Apologies if this is a bit too off topic but surely this must be a common question for rePhase users. I'm wondering what the suggestion would be for what I think is a very common scenario, integrating a set of subwoofers into a 2ch system, doing room correction and linearize passive main speakers.

My system looks like this:
MacBookPro => Chord DAC (line level or digital volume control) => Benchmark power amp => Kef LS50
Adding 2 x JL Audio e112 subwoofers with line level inputs.

How can I achieve this without introducing an AD/DA cycle? The only solution I have found so far is a DEQX as it has:
1. digital input
2. digital output (to Chord DAC)
3. analog output (to subwoofers)
4. digital 32 bit volume control
5. ability to time align the whole system

as we know, DEQX is not cheap
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Old 23rd March 2018, 08:00 PM   #2479
454Casull is offline 454Casull  Canada
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Quote:
Originally Posted by nefilim View Post
Apologies if this is a bit too off topic but surely this must be a common question for rePhase users. I'm wondering what the suggestion would be for what I think is a very common scenario, integrating a set of subwoofers into a 2ch system, doing room correction and linearize passive main speakers.

My system looks like this:
MacBookPro => Chord DAC (line level or digital volume control) => Benchmark power amp => Kef LS50
Adding 2 x JL Audio e112 subwoofers with line level inputs.

How can I achieve this without introducing an AD/DA cycle? The only solution I have found so far is a DEQX as it has:
1. digital input
2. digital output (to Chord DAC)
3. analog output (to subwoofers)
4. digital 32 bit volume control
5. ability to time align the whole system

as we know, DEQX is not cheap
The miniDSP nanoSHARC checks off 1, 2 (if you can make the Chord DAC accept I2S), and 5.

3 will require a separate DAC if you want to keep using the Chord.

4 is tricky but there are a number of multichannel volume control projects on diyAudio that can serve this purpose.

Alternately, you can insert an OpenDRC-DI in between the MBP and the DAC and then use an active crossover after the DAC. The DSP in the OpenDRC-DI is not as powerful as in the nanoSHARC though.

Last edited by 454Casull; 23rd March 2018 at 08:03 PM.
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Old 2nd May 2018, 05:51 PM   #2480
RAzZin is offline RAzZin
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Hello everyone,

I can't understand how to make rePhase understand REW measurement files. Attached are the screenshots from REW measurement, I export it as txt, then open in rePhase and what I get is on the 2nd screenshot. What is wrong? I'm using UMIK microphone, Windows 10... Could someone please help me?
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File Type: jpg right REW.jpg (217.5 KB, 205 views)
File Type: jpg right rePhase.jpg (625.8 KB, 203 views)
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