No, Randy; setting the filter at 150Hz doesn't literally "bypass" it(that's why I used the term "essentially"), but it's far enough above the 24dB/octave low-pass at typically 80Hz which the receiver is doing that it doesn't significantly affect the crossover area. Since the filter is actually still in the circuit, one effect that it does have is to cause a delay which results in receiver distance calibration showing an acoustic distance significantly longer than the physical distance.
That's right, the DSP processing isn't part of the class D operation; that's why I used the term "basic" in saying what wasn't digital.
