I am *very* skeptical about the "50 watt RMS" claim on
these. I couldn't find any manufacturer's info, the
tweeters come from China, and the only sellers were on Ebay.
Also, I didn't see any claim about frequency response, even
in the audio range, let alone ultrasonics. (Some piezos
that I've used do have reasonable output above 20 kHz, but
with wild dips and peaks.)
This looks to me like just another inflated audio spec,
especially given that the tweeters look like they could
handle a few watts at most, before going up in smoke.
If there is any validity to the "50 watt" spec, it is
probably from the fairly common approach of advertising the
power of the amp that drives the whole audio range. In such
a case for "normal" music, etc, almost all of the power is
going to be used by the woofer. If you set the crossover
frequency high enough, the audio power to be handled by the
tweeter is pretty small.
Just my $0.02 worth...
Bob Masta
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