Ok...I borrowed a Mark Levinson 433 from my dealer who had let me try the Parasound A21.
The ML 433 is very good - better texture to the bass and more refined treble compared to the W4S ST1000. And was able to play at high volume without clipping like the A21.
My question is now why would the A21 clip and the ML 433 would not given the same speakers and set up? Is this due to the power transformers and capacitance of the amps?
One day I may actually know something about this stuff!
Dsper