Arny Krueger wrote:

"Pooh Bear" wrote in message
...

Yes - noise does drive up the figure but simple examination of the
analyser
output on a scope wil show shedloads of crossover on most 'run of the
mill'
amplifiers.

An experienced eye ( such as mine ) can interpret the waveform rather
well.

Look Graham I was probably looking at crossover distortion from SS before
you were born. ;-)

I rather doubt that actually.

Furthermore, crossover distortion shows up like a sore thumb on a spectrum
analyzer - all the high order garbage.

The 'order' varies with design actually.

You're very mistaken to think it's all high-order.

The only circuitry I've seen that's effectively free of the effect is a
mosfet
output stage - optimally biased.

I just don't know what srt of amps you've been looking at.

Well........... If you want one of the worst examples I can think of - think
QSC !

The RMX is better than the MX but it's still pretty rubbish. I'd expect the
USAs to be even worse. The 'criminally' deficient biasing method deosn't help !

This includes cheap IC chips, cheap receivers, and cheap
autosound amps.

The IC chips are frequently the worst examples.

Please name a readily available modern chip that is offensive. I'll run
right out and buy one and test it.

LM386 !

Graham