On Thu, 11 Oct 2007 06:12:50 -0700, Larry Jaques
wrote:


Transistors were switching, rise & fall of
probably a microsecond or two. No problem producing a squarewave up
to 40 KHz. A 47-ohm series resistor in conjunction with the
capacitance of the speaker rounded this off to a semblance of a sine
wave.

Bueno. What's this 20 ohm 30 watt "square ohm" resistor they're
talking about? Anything like "cam dusters" or "Kanutin valves"?
http://www.adelcom.net/MOTOROLA_ksn1005b.htm

They claim it's to enable use of an L-pad. 30 watts is ridiculous, 1
watt would be plenty.

A shunt resistor would be better for use with an L-pad. It might
indeed need to be 30 W, and it should be used with a crossover.

Some think a piezo tweeter sounds better with series resistance.

None of the above applies to a ratzapper.