Have you tested REW generated EQ export to DSP-8C? Is this working correctly?
I have made REW EQ export as described (very shortly) on web manual and results did not fit with REW predicted response.
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Colinear Acoustics - new 8 channel DSP preamplifier
- Thread starter J_S
- Start date
I have made REW EQ export as described (very shortly) on web manual and results did not fit with REW predicted response.
Yes, I have been using the export to txt (so not biquad) this is very convenient as it gives you easily further editable filters in the 8C. I have had no issues with that. I remeasure with REW and do not recall any issues.
The latest beta version
What kind of REW generated EQ filters you tested? Have they been complicated, multiple overlapping as on image below?
I had made multiple REW generated EQ-s for DSP and all of them had not fit with REW measurement results when REW adds EQ filters to sweep measurement signal.
I had made multiple REW generated EQ-s for DSP and all of them had not fit with REW measurement results when REW adds EQ filters to sweep measurement signal.
Draki
Active Member
- Joined
- Jan 22, 2020
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The graph shows 22 generated filters. Did you use "generic" EQ option in REW?
The recommended EQ as per their manual is "generic> extended" (which has a capacity of a total of 20 filters).
Could this be the reason? I don't know, I am only trying to help solve the problem.
The recommended EQ as per their manual is "generic> extended" (which has a capacity of a total of 20 filters).
Could this be the reason? I don't know, I am only trying to help solve the problem.
I probably find the solution.
If I generate Generic/ConfigurablePEQ select there Q/BW format Symmetric and modify REW QE export text and change note to "Equaliser: Extended" then import to DSP works and measurement fits well with REW prediction and fits even better with REW measurement when EQ is applied to sweep output signal.
If I generate Generic/ConfigurablePEQ select there Q/BW format Symmetric and modify REW QE export text and change note to "Equaliser: Extended" then import to DSP works and measurement fits well with REW prediction and fits even better with REW measurement when EQ is applied to sweep output signal.
Who misses analog input and need more SPDIF inputs can get them with some optional devices.
www.tindie.com
www.minidsp.com
Works well, I have tested them.
Automatic SPDIF (Optical/RCA) Audio Switch by Beni_Skate on Tindie
Automatic Optical/RCA SPDIF Audio Switch with Optical/RCA SPDIF Output and additional high quality Audio DAC
www.tindie.com
PocketADC
The miniDSP Pocket ADC is an extremely compact high-resolution A/D (analog-to-digital) convertor that accepts a stereo analog input on single-ended (RCA) connectors and converts it to SPDIF coaxial and TOSLINK optical digital outputs. This pocket size converter supports high sample rate and...
Works well, I have tested them.
I would use Wiim Pro Plus for analogue in, if and when the tone comes..Who misses analog input and need more SPDIF inputs can get them with some optional devices.
Automatic SPDIF (Optical/RCA) Audio Switch by Beni_Skate on Tindie
Automatic Optical/RCA SPDIF Audio Switch with Optical/RCA SPDIF Output and additional high quality Audio DACPocketADC
The miniDSP Pocket ADC is an extremely compact high-resolution A/D (analog-to-digital) convertor that accepts a stereo analog input on single-ended (RCA) connectors and converts it to SPDIF coaxial and TOSLINK optical digital outputs. This pocket size converter supports high sample rate and...
Works well, I have tested them.
it currently offers limited settings (2000, 1000, 800, 500, and 200mV).
The Pro Plus offers 192MHz input sampling and 2V vs the Pros lower spec ~1V and 48KHz.
From different AI level perspective Wiim Pro Plus even better than https://www.minidsp.com/products/usb-audio-interface/adept
Only Wiim did not have this information in specification.
Only Wiim did not have this information in specification.
Do you mind giving a bit more info on how to crop the FIR filters for use in Colinear DSP with REW? I have used Focus Fidelity with PC based Convolution REW for Speaker measurements but have no real clue what exactly to do or how to save or edit to pull this off. Thanks in advance.
Keith_W
Master Contributor
I don't know what format Colinear uses. Could be .WAV, could be .BIN. These instructions are for .WAV. If the Colinear does not use .WAV, you will have to figure out how to convert a .WAV file to whatever format you need. I am sorry I can't help you with that.
Anyway, choose "File-export impulse response as WAV". You will see this dialog box:
Take note of some important settings:
"32-bit float": check whether your DSP unit can accept this. Most likely it can.
"Export this sample count": look up the tap count of your DSP unit. If it's 1024 taps, choose 1k. If it's 2048, choose 2k. And so on. It is important that this matches your DSP unit!
"Sample rate": this MUST match the native sample rate of your DSP unit. Look it up in the manual.
"Place t=0 at sample index": for a linear-phase filter, place t=0 in the middle of the tap length (in this case, 512). For a minimum-phase filter, leave the option unticked.
"Normalise samples to peak value": if your exported .WAV is part of a HPF or LPF, leave this option unchecked. You will need to manually normalize the filter. ONLY tick this box if it is a full range correction.
Note that I have left "Apply IR window before export" unticked, and chosen "Export measured IR". This is because I have already applied minphase and EQ filtering during the filter creation process. You want REW to export the filter unmolested.
Opps, sorry, have not been here for a while. It can use .bin files that are generated by rephase. It can not use wav files from REW. In REW what I do, i load the wav impulse responses that are generated by focus fidelity, then I apply an IR window with length of 83ms or so, starting usually about 1ms before the impulse peak. Then i save the impulse response to text in REW with the window enabled. Then I select the piece of text that describes the impulse response, copy it and manually paste it in the the DSP. It is a bit of a workaround but it works, impulse response has to be max around 8k samples, therefore the 83ms or so window that I apply in REW.
Thanks for the heads up, changelog on their support site - quite a few things updated.
