Help with REW EQ for desk setup - measurements attached

[Gershy13]

You need a reverse all pass filter to correct an excess phase peak. Reverse AP filters can only be obtained with linear phase FIR filters. A MiniDSP 2x4HD does have FIR filters, but these are severely limited in tap count - only 1024 taps. Low tap count means limited resolution of correction. You would need about 65536 taps as a minimum.

So realistically I cannot do anything with my current DSP to correct the phase or room issues? I can just apply REW EQ filters. The ADAU1701 is the same as used by the MiniDSP 2x4 (non-hd).

 

[Keith_W]

At the moment, all you can do is apply minimum phase EQ, which means that all the corrections can only be injected at the main impulse, or after. If you have a cancellation due to excess phase, you need to inject the correction before the main impulse (time reversed all pass filter) which requires linear phase FIR.

 

[Gershy13]

At the moment, all you can do is apply minimum phase EQ, which means that all the corrections can only be injected at the main impulse, or after. If you have a cancellation due to excess phase, you need to inject the correction before the main impulse (time reversed all pass filter) which requires linear phase FIR.

Looks like my best option is just standard PEQ for now then. Instead of a minidsp it'll probably be more cost effective to get a 4 channel dac/audio interface and do the FIR filtering on my PC or with a raspberry pi and camilladsp.