Hi!
Basically I'm using RePhase as equalizer (nothing fancy it would seem, just generate a filter after adjusting the gain EQ phase)
My hardware for this is OpenDRC
I have several questions
1)
Centering part of RePhase UI allows to specify delay in ms instead of "middle" or "energy"
Middle doesn't seem to work at all (the optimization step never finishes, goes into thousands of iterations and keeps going for many hours with no end in sight)
energy works, filter is created but UI printout claims that expected delay is quite hefty - 52ms (ouch, I guess)
specifying some very low ms value (2ms) results in apparently successful creation of filter with no apparent deviation (both thick red line for gain and punctuated red line for phase match the predicted curves perfectly)
What is the tradeoff from specifying a very low delay value (1-2ms) in the "centering" part of UI specifically in context of using minimum-phase gain EQ for headphones?
Would the resultant EQ be somehow deficient / introduce unusual noise / ring / anomalies relative to the energy-centered, "heftier" 52 ms version?
2)
Does it make sense quality-wise and latency-wise to break the EQ down into "problem" part that PEQ GUI of open DRC doesn't handle (due to Q<0.5) and "do the problem part" in FIR and then add the missing "normal" peaks (Q>1) via OpenDRC's PEQ interface (thus essentially chaining filter-as-EQ and "proper built in EQ")?
To center in ms , the filter taps need to be at least the length or half (??? What I’ve noticed) of the amount of delay…. Like you can’t do 10ms on a 200tap fir , but could on a 1024tap fir for example
moving the centering forward is for getting better centering on low frequencies. You can use “less taps” and get good phase and amplitude on your fir
you can’t capitalize “ms” in the box or put spaces
i think Just try all lower case like centering ten milliseconds would be typed ; 10ms
if your using an OpenDrc and doing a correction on everything I would go for use center of impulse or exact centering. Use the max taps if it won’t generate clean. And try starting with a rectangular window first and try other windowing schemes after rectangular works. (I always use rectangular or Hahn)
and you should see 64ms of delay using the 6144taps. So 52ms isn’t bad.
as far as other errors, idk , pos would know