How to export and load FIR filters for ROON

[avangerx]

Hello everyone, **I had to edit my previous post as it was very confusing **
I know how to make FIR Filters with REW. I have not made any FIR filters for use with ROON. My questions are:
1. When measuring with REW, should I measure the Left and Right channels together at the same time, or should I measure the Left and Right channels separately before applying EQ?
2. When exporting from REW, do I need to create Left and Right independent FIR filters or export as L + R stereo FIR filters? How does Roon accept it?
3. I read somewhere that I need to upload the FIR Filters to Roon as a zip file for different sample rate exports, so how should I load my FIR Filters to Roon?
4. Are there any best practices or pieces of advice while creating my FIR Filter and loading them to use with Roon?

Thank you in advance.

 

[Keith_W]

You sound like you need a book to explain the entire DSP process. This is an extremely brief summary:

Step 1: Choose software to generate FIR filters. REW can do it, and it's free. But it is not for beginners. REW was written as measurement software, its primary focus is NOT making DSP filters. You might find it easier to use specialised software for making DSP filters, e.g. Audiolense, Acourate, Dirac - these are the most popular choices on ASR. If you want, you can read the free Acourate guide or read some reviews on Audiolense and Dirac on Audiophile Style by mitchco.

If you choose to stay with REW, go watch OCA's videos on Youtube.

Step 2: If you use REW, you have to write your own .CFG file with all the correct .WAV files and then load that into Roon. I don't use Roon, so I can't tell you how to do it. Maybe someone on ASR can help you, but you may be better off asking in Roon's forums.

The DSP process is not something that can be explained in a forum post.

 

[avangerx]

You sound like you need a book to explain the entire DSP process. This is an extremely brief summary:

Step 1: Choose software to generate FIR filters. REW can do it, and it's free. But it is not for beginners. REW was written as measurement software, its primary focus is NOT making DSP filters. You might find it easier to use specialised software for making DSP filters, e.g. Audiolense, Acourate, Dirac - these are the most popular choices on ASR. If you want, you can read the free Acourate guide or read some reviews on Audiolense and Dirac on Audiophile Style by mitchco.

If you choose to stay with REW, go watch OCA's videos on Youtube.

Step 2: If you use REW, you have to write your own .CFG file with all the correct .WAV files and then load that into Roon. I don't use Roon, so I can't tell you how to do it. Maybe someone on ASR can help you, but you may be better off asking in Roon's forums.

The DSP process is not something that can be explained in a forum post.

I think you misunderstood me. I already know how to create FIR Filters with REW and correct phase with RePhase. I use my FIR filters with Camille DSP or Signalist HQPlayer. However, I have never used it with ROON, so I wanted to know 3 things:
1. Should I measure my Right and Left channels together at the same time and EQ it as a Stereo R+L channel, or should I take each channel separately?
2. Should the exported wav file be a stereo FIR file or mono for each channel?
3. How should I load my FIR filters to Roon (best practice)?

 

[Keith_W]

1. The DSP process is the same as any other. Measure L/R individually and EQ individually. Then measure them together to make sure there are no issues.
2. My DSP software (Acourate) can automatically create FIR files for Roon. It looks like you need a zip file. Inside the zip file, there are stereo .WAV files at different sample rates, as well as a .CFG file* for each sample rate.
3. Don't know the exact process for Roon since I don't use it. But a lot of people don't like Roon's convolver since it is lacking in features (IMO the biggest feature it lacks is A-B to compare filter files). You can send the output of Roon into Camilla or HQP via ASIO.

* If you are manually generating filters with REW, you will need to write your own .CFG file. You can find instructions on how to do so here. Or you could modify this to your needs (this is a stereo 3 way system - i.e. 6 channels, with 48kHz sampling rate). "Cor1S48.wav" is a stereo .WAV file.

48000 2 6 0
0 0
0 0 0 0 0 0
Cor1S48.wav
0
0.0
0.0
Cor1S48.wav
1
1.0
1.0
Cor2S48.wav
0
0.0
2.0
Cor2S48.wav
1
1.0
3.0
Cor3S48.wav
0
0.0
4.0
Cor3S48.wav
1
1.0
5.0

 

[OCA]

Roon doesn't need zipped files or a config file. Export your left and right speaker filters as one "stereo" .wav file at 48kHz sampling rate from REW. Direct Roon's convolution engine to that .wav file you saved and that's it. Don't normalize them as that would cause clipping in Roon. Use IR windowing to avoid too many taps and a slow filter.