A class D monoblock is a highly efficient and more powerful amp suitable for sub-woofers. But they may not be that suitable for speakers/tweeter due to high distortion.
In a class A amplifier, the active device (transistor) is biased so it always conducts some current, usually outputting about half the supply voltage under quiescent (no signal) conditions. The input...
A transformer-coupled class A amplifier is just what it says it is. You'll recall that a class A amp is one that has an output that varies through all 360 degrees of an input signal. As regards the...