Graham Holloway schreef:
"Arny Krueger" wrote in message
. ..
"max graff" wrote in message
oups.com
Hi guys,

Pardon my lack of technical lingo but Rotel and a few
other companies have been flaunting class D power amps.
I know that class A is the best in amplification
Class AB done right is just as good, if not better.

however attaining that level at higher wattage is only
hypothetical.
Not to mention stupid.

I want to know what and how good is the supposed class D
amplification.
Current implementations seem to underperform its potential.

The biggest problem with switchmode operation letely has been keeping the
switching pulses out of the speakers. Running the switches faster is the
obvious solution, as it is easier and more practical to build high powered
filters, as the frequency being filtered out goes up.

Right now a lot of class D amplifiers seem to suffer from excessively high
output impedance near the top of the audio range.


That's probably due to the aforesaid filter.

Graham H



Make that certainly.

It's a public secret there's only a small market for better sounding
equipment. Most people don't bother because they want to hear amplified
sound and do not enjoy the quality, especially when expensive. There
lays the problem manufacturers are facing.