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You have no idea, what constitutes current ability into low impedance loads with complementary Mosfets vs Bi-polars. https://dw8stlw9qt0iz.cloudfront.net/8helUHVPvP20LeKbM_SlMzQnfMw=/2000x2000/filters:format(jpeg):qua... |
If memory serves, BTL usually raises the total output impedance. Perhaps that's a contributing factor in liking it or not? Otherwise, the discussion about current/power delivery in MOSFETs vs bi-polar transistors is silly. Parallel devices, driver stages and feedback are all able to create any amount of current and power with either device type. Which brings me to another point: Feedback, and lack thereof, can have a profound effect on the amp sound and characteristics. Luxman amps rely heavily on global feedback in their Class A amps, and they are fabulous. Some other Class A makers use local or no feedback at all. I suspect that speaker matching, and what sound you like lies largely here. |
The classic comparison is between Pass And Boulder Warm VS Dry, Tubish vs Transistorish. I am not totally sure about this but there is something about Class A bipolar amps which causes the designers to want to use fans and fancy bias tracking schemes. Do they generate more heat or require higher bias voltages. Pass seems to always avoid this but he does not run his power higher than 300 watts whereas Boulder will go much higher. JC simply switches over to AB which you can hear in the JC 1. Push it into steady AB and it loses its effortlessness. It still gets as hot on low impedance loads as a Pass amp. |
