Originally Posted by dstew100
He's point about frequency vs time domain is interesting though. Audyssey and Antimode both claim time domain corrections. Is that possible with minidsp? I'm aware of the time delay, but is one overall time delay per channel really what is needed to compensate? I probably don't understand enough at this point to even ask the right questions, I'll read that link you provided.
That ends up being a somewhat complex question which I'll split into two.
First, there's the question of whether fixing up, say, a response peak with EQ will fix up the phase as well (which would also fix up the time domain quirks caused by that peak). The answer is that if e.g. the peak is in a minimum-phase region of the response, and the EQ is minimum-phase, flattening the response will indeed fix up the phase in the frequency region over which the EQ acts, which in turn will fix up (only) the time domain quirks caused by that specific peak (which you might verify with a waterfall plot). The filters in the miniDSP are of the minimum-phase type. The link shows how to determine whether the response region you're trying to EQ is minimum-phase or not.
The other issue is that most speakers, when considered over their full bandwidth, are not minimum-phase. This behavior causes time domain quirks in such speakers. Fixing up these kinds of quirks is done by so-called delay equalizers. The miniDSP does not do this. Not sure if Audyssey does, and I'm only aware of one audio product (by Thuneau) that actually does this, though there may be many more.