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Author Topic: Fir filter/convolution problem JRiver, Rephase& Rew  (Read 265 times)

Korppi

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Fir filter/convolution problem JRiver, Rephase& Rew
« on: November 02, 2024, 10:59:22 am »

I have been driving active diy speaker setup:
Source--> JRiver --> convolution, crossovers 6h--> rme ufx--> amplifiers-->speakers

Crossovers are done with rephase and eq with  the eq in the rephase

Convolution file is text .cfg form

This setup sounds good to me....

So then i just wanted to see what is the max out of my old Behringer truths b2031a's, so i decided to eq them flat. To get rid of that rising tweeter response. Took measurements with rew and imported them to rephase. Used the same linear phase eq in rephase as always...

Made two channel .cfg convolution file (Behringer left and right)

Imported it JRiver and started playing..

Sounds completely horrible! All the clarity is gone and its like dual mono but much worse...Soundstage gets really narrow to the center/middle of the speakers .

Problem is clearly in the convolution, because i tested it by importing the rew suggested eq correction (Hz,q gain) manually to the JRiver parametric equalizer and clarity came back and equing is working makes the sound better than the factory  b2031a setup.

In the attachment is the .cfg file

Its easy to make mistake with the file so i made it 4 times just to be sure

Only thing in JRiver DSPstudio in use when i tested was "output format" was set to 2ch + convolution of course

I have noticed that using "volume levelling" and "adaptive volume" in JRiver DSPstudio makes sound quality much much worse but those were not on

Where is the problem?
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mattkhan

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Re: Fir filter/convolution problem JRiver, Rephase& Rew
« Reply #1 on: November 02, 2024, 02:12:11 pm »

Your post is fairly confusing, it's very unclear what you are comparing and how.

https://wiki.jriver.com/index.php/Verifying_DSP_Studio explains how to sweep through dsp studio and feed that into rew. I recommend you try it and compare whatever your two setups are and see how they differ.
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Korppi

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Re: Fir filter/convolution problem JRiver, Rephase& Rew
« Reply #2 on: November 02, 2024, 03:06:29 pm »

The problem:

If i use convolution to eq the Behringer, it sounds really bad, it shouldnt..

If i use parametric equalizer to eq the Behringer, it sounds good..

Problem is, theres big time problem with the convolution and thats what i am trying to find out

Nothing to do with equing itself.. rew is so much better for these things
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mattkhan

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Re: Fir filter/convolution problem JRiver, Rephase& Rew
« Reply #3 on: November 02, 2024, 03:22:01 pm »

it will surely be some major difference in the filters then

use the approach described in the link I gave to measure for yourself, it will show the difference
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Korppi

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Re: Fir filter/convolution problem JRiver, Rephase& Rew
« Reply #4 on: November 02, 2024, 03:35:17 pm »

I got you, good idea, i will try
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