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General speaker questions for audio and home theater.

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Phase, crossovers, bass alignment

Posted by badman on August 17, 2009 at 07:56:33:
So, the topic's been pretty well covered. Couple points:

There IS phase shift with a first order crossover, just not nearly as much. A true first order alignment is clean in the time domain, but 'true' first order designs are extremely rare for a variety of reasons. Directivity changes make the slow rolloffs tough to achieve across a broader response window, and both drivers must be exceedingly well behaved. Do you know a lot of 12"s that are clean at 5kHz?

Bass alignment causes phase shift in all speakers. Infinite baffle designs are the best in this regard for audibility sake, generally, as there's no raising of the Fc and thus the phase shift takes place around and about Fs rather than a higher Fc. This applies to open baffle as well, though the summation of the front and rear waves makes matters somewhat more complex. In any case, it's low enough that it's less of an issue of concern than a midwoof/tweeter crossover, which is bouncing around in or on the high end of the vocal band.