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Usually inverting the polarity

of a driver in a system designed with it inverted actually creates a hump, rather than a notch. The inverted driver, being reversed to the polarity of the adjacent driver will generate cancellation where the frequencies overlap, and thus give the system a perceived steeper roll off at the crossover point.

I find the humps generally acceptable as it is not always that there is music in that overlap range. In your case, I would guess that the crossover is in the 2K to 3KHz range. Being that tuning A is about 440 Hz, you're in the fourth harmonic range for the most part.

As for hearing sensitivity range, calculate the distance between your ears (seriously !). That would translate to a wavelength of about 2.2 K Hz or thereabouts. Hearing sensitivity should be centered on about that frequency. Also consider the range of human voice: about middle C (~260 Hz) and up three octaves to about 2.1k Hz. Piano scale runs about 30 Hz to about 10k Hz. Because of the logarithmic nature of hearing, human perception is remarkably skewed to the bottom end of the scale, numerically.

Stu

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