I'm not quite sure. Is it possible to tune the frequency at which the allpass filter will reach "-1" (and also the frequency at which it begins to change phase) using an op amp? Equally, i'd assumed that a crossover circuit would continually decrease in gain, rather than settling at 1/2 gain. If i'm wrong, this sounds great. Could you recommend any books or websites for researching this?
Sorry to seem slightly clueless.
Thanks,
Robin
(Also, to clarify, the two components would be feeding separate amplifiers going to separate speaker drivers)