"Kevin McMurtrie" wrote in message
...
In article , B
wrote:

I am doing an experiment where I have to send a 20K- 25K tone constantly
through a speaker. This has to continue for 24 hours. The magnet or coil
becomes too hot to touch. Right now I'm using a full range speaker. If I
use a specific tweeter for high frequencies will it stay cooler?

Thanks,
Bruce

Try a piezo horn tweeter from Radio Shack. It will produce 20KHz at
migraine inducing levels with no problem. Cheap piezo tweeters have a
whacky frequency response so you might need to adjust your tone a tiny
bit to avoid dead spots.

I double the suggestion to use a piezo horn. I have done hundreds of tests
that required acoustic energy at ultra-sonic frequencies and I was able to
create that energy very easily with a piezo horn and a small amplifier. I
suggest running a 4 or 8 ohm power resistor in series with the horn,
however, to reduce ringing that can blow the amp or the horn.

- FLINT