Accustic Arts Power 1 - operates in Class A?

On one hand crossover distortions are reduced at slightly higher level when amp stays longer in A class biasing (higher bias) but at the same time gm doubling distortion at higher levels are increased. Measurements made by Douglas Self, Bob Cordel and many others show the lowest distortions at particular bias (optimal bias). Overbiasing is not the trade between quality and power dissipation but it will increase distortion. Mentioned gm doubling is change in gain of amplifier's output stage between class A (two transistors working) and class AB (one transistor working). Perhaps there are ways to minimize effect of gm doubling (trans-conductance doubling) but increasing bias in amplifiers not designed for that might lead to increased distortions.

It's a class A/B amp. I had one a few years ago.

Kijanki, I just recently read a thread on this very subject on DIY. This discussion revolved mainly around BJT outputs and there was an unanswered question regarding mosfets. However, in applying this school of thought, I'm perceiving a sonic difference when backing off the stock 300ma bias setting in my Acoustat TNT200 mosfet amps. Can you please elaborate on this? Thank you.

I guess my question is whether the same principals apply or am I hearing things?

Thank you, Elizabeth. But my question is not whether it's class A. I already know it's A/B. I was questioning whether(optimal bias) as regards BJT outputs applies to mosfets.