The use of GaN-based power transistor tech is now emerging for Class D audio power amplifiers. Seems appropriate to devote a forum thread to this topic. At least 3 companies have commercial class D amps in their books:
Merrill Audio, with their model Element 118 ($36k per monoblock, 400 W into 8 ohms, 800W into 4 ohms), Element 116 ($22k per monoblock, 300 W into 8 ohms, 600W into 4 ohms) and Element 114 (coming soon). https://merrillaudio.net
Once again the seminar lecture if you missed it. From Electronics Foundations: Semiconductor Devices
BJTs tend to have better, more linear gain characteristics…and can give
you a lot higher voltage gain than MOSFETs.…They’re also able to handle
higher output currents…and have a lower output impedance.…That gives
BJTs a huge advantage over MOSFETs…for building amplifier circuits…that
need to provide a significant amount of output power…and or drive loads
that have low input impedance.…MOSFETs are going to have a harder
time…driving a low impedance load…because they have a higher output
And if you can’t understand that then in my book you and your maths are worthy of being ignored, end of story.
@georgehifi Do you get why this passage you quoted is is completely irrelevant (i.e. has nothing to do with the conversation)??