Talk:Midwoofer-tweeter-midwoofer
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crossover and directionality
[edit]There was an uncited statement...
"The configuration desires 3rd order (18 dB/oct or 60 dB/dec) crossover allowing the drivers to have similar horizontal dispersion, resulting in absence of any sudden change in directivity with frequency"
What?!
Crossover only affects dispersion insomuch that it dictates where one driver begins & the other ends... which is to say, the only thing affecting dispersion... is the driver. There is nothing a crossover can do to alter the dispersion of a speaker because a speakers dispersion is determined by it's mechanical characteristics. For instance, a soft dome tweeter is a DOME & it's dispersion pattern is A DOME.
What does it do?
[edit]Higher order crossovers can help lessen the effect of the VERTICAL off-axis response error which is inherent to the MTM design. Being vertically off-axis with an MTM introduces a time delay between the concurrent woofers. As you approach the crossover frequency, or rather, as frequency becomes more directional, the phase shift between the two woofers can become more and more apparent, therefore, a sharper decline in output from the two woofers can potentially help make the phase shift less apparent, but it can not completely negate the phenomenon as we are talking about the phase of the sound-waves arriving to your ears, not the electrical phase of the signal relative to crossover design.