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Re: FIR filters

Lots of taps...

Your guesses look about right, 10ms latency can flatten phase to 100Hz, takes around 33ms to 30 Hz, unacceptable for live use.

#544 answers some of your questions in more detail:

http://www.diyaudio.com/forums/multi-way/221434-rephase-loudspeaker-phase-linearization-eq-fir-filtering-tool-55.html