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RE: Ultrasonics?

> > Infinity Emit-K is flat to 45khz. < <

Possibly, but I doubt it. The only way to measure this properly would be with an 1/8" Bruel & Kjaer measurement microphone. While there *may* be some output at 45kHz, I would be shocked if it were "flat". That floppy diaphragm will have all kinds of resonances above a few kHz and so will the plate with the slots. One could spend months trying to juggle the resonances to approximate a "flat" response, but my guess is that one would be lucky to achieve ±6dB between 10kHz and 45kHz.

Almost all loudspeaker manufacturers use 1/2" measurement microphones that barely make it flat to 15kHz and then are 1dB or 2dB off by 20kHz. After that they are pretty much dead by 30kHz.

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