Why do I like Class AB better than Class A?
also, thanks for the clarification. I didn't know this amp had a switch that altered the internal circuit bias. However, to be clear, all it did was change the bias point from a lower to higher output driver bias. Which is a good circuit design idea as long as you have the power supply capacity and the proper heatsinking for the output drivers. Full output class A is wonderful for those cold days and nights when I want an extra space heater. Tube amps are also good for this. enjoy |
FWIW, when comparing Threshold model amps that had similar chassis, though with differing bias, etc., that were sold as different models with either Class A or Class A/AB (Class AB) output; other than running hotter and with lower total power output, the Class A amps were smoother and more laid back, while the Class A/AB (Class AB) amps ran cooler, had more total power output, were more dynamic and more upfront, though not as suave. Depending on the speakers, the room, preferred live musical event seating, sonic priorities, and of course budget, I could imagine different people having different preferences. FWIW, I'd prefer the best of both worlds, cool running, dynamic, neither laid back nor forward, suave sounding, Class W hatever. So far it's typically been high powered Class A amps that have come closet to most of those ideals (except of course for the heat, which I could most easily make an exception for), unfortunately the costs of such amps have just as typically escaped me. High biased Class AB amps have so far become the prudent choice, at least for me. YMMV. Class D might change all that, we shall see. |
it is possible you prefer greater resolution in the ab mode that you feel is lacking in the a mode. i would imagine that in class a, your amp is an electric bill. the plinius was recommended to me to use with panel speakers. i would like to hear what they do with electrostatic speakers, but have not heard them. |
Mrtennis, you can expect most transistor amps to be somewhat bright and lacking bass on most full-range ESLs like the Quad ESL 63. The impedance curve of such speakers and the way they operate simply does not favor most transistor designs. there is more information at this link: http://www.atma-sphere.com/Resources/Paradigms_in_Amplifier_Design.php |
