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RE: George Louis

Don't forget the crossover.

All filters affect the phase, a low pass has an output whose phase lags behind the original signal while a high pass advances it.
The shift is 45deg per pole in either direction. Consequently a 12dB/oct (two pole) 2 way crossover requires either the tweeter or the woofer to be inverted so that bass and treble are in phase with each other because the low pass retards phase by 90deg while the high pass advances it by 90deg.
90 + 90 = 180 hence one of the drivers has got to be inverted to maintain correct polarity throughout the speakers pass band.

Any suck out observed means that the output of woofer and tweeter are NOT moving in the same direction.


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