Mr P.

The d in class-d,does not stand for digital,in fact when these amps were first introduced a,b and c classes were already used hence the d.These amps are commonly called switching amps,the output transformers are switches.They tend to generate less heat,so they dont need large heatsinks,so can be smaller in size.There are analog and digital types of class-d amps,analog are considered the best by most people.With some very expensive exceptions(Meridian)all speakers are analog and must be fed an analog signal.

bill