"ScottW" wrote in message
On Mar 4, 6:30 pm, Doug McDonald
wrote:
On 3/4/2011 2:35 PM, ScottW wrote:
Now I'm not saying that some people can't hear well
above 20kHz, but I've never meant anyone who could
prove it.
All you need is me and a time machine.
I DID test using a signal generator, a good quality HP
one, and an AR3a speaker. I really could hear very
clearly, strongly, to 22 kHz, and weakly to 23. Some
others could too.
I wonder if that classic tweeter really has low enough
distortion at those frequencies to be useful for such a
test.
Most likely it does. Dome tweeters are just another flavor of direct
radiator, and their nonlinearity goes down with as the excursion of the
diaphragm goes down as frequency rises. Dome tweeters with 0.5 % (-46 dB)
or less nonlinear distortion above resonance are pretty common.
Check this out:
http://www.jblpro.com/catalog/suppor...pe=3&docid=569
On page 4 we have "96 dB/1 m (Distortion raised 20 dB)"
Note that above 200 Hz, distortion is generally at least 45 dB down.
I chose a "Professional Monitor" only because this type of speaker is
frequently specified to this level of detail.