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Re: Whats the low-frequency slope of BASSMAXX One's?

Posted by tomservo on August 25, 2003 at 10:39:18:
Hi
If one passes a square wave through a Hilbert transform (producing a constant 90 degree phase regardless of frequency, like a direct radiating woofer midband), what comes out looks nothing like a square wave.
All harmonics are shifted Â¼ cycle (which is a different time delay for each F) which is reassembling the waveshape and while it still has the same FFT amplitudes for the harmonics, it is not a square wave.
John is correct in his assertion and you can see the shape of the acoustic phase in a direct radiator by looking at the phase of the electrical current, that is the â€œmoving forceâ€ which the radiator / motor system responds to.
While the scale is not the same (because of the series R in the motor), where the electrical phase is capacitive, so is the acoustic phase, where inductive (below box fb and above R-min), so is the acoustic phase.
Tom