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Which amplifier class is used in professional audio gear?
Old 21st February 2020
Here for the gear
Which amplifier class is used in professional audio gear?

Hello, everybody. Hope you're all well.

I know that Class A amplification yields the less distortion/highest fidelity when amplifying audio signals, but I don't know if EVERY piece of studio gear is Class A or if there are other classes used in different types of gear.

Thanks in advance.
Old 21st February 2020

Nearly all gain stages that are push-pull in a studio are either class D or class A/B.


Old 21st February 2020
Lives for gear

For power amplifiers of significant output, class A is woefully inefficient. Indeed, even for small signal amplifiers it's inefficient enough to be troublesome if you have many of them (as in a mixing console). Most small signal amplifiers, such as preamplifiers, are class AB with not much crossover between the push and the pull stages; that includes virtually all opamps.

Power amplifiers for loudspeakers are nearly invariably class AB or class D, the latter being increasingly common as it's lighter weight and more efficient. Rarely if ever is evan a halfway decent power amplifier anywhere near a major contributor to distortion or lack of fidelity provided it's not overloaded and clipping; the distortion of even a very good quality loudspeaker is at least an order of magnitude greater. Nor, for that matter, is it necessarily true that a class A amplifier circuit will inherently have lower distortion than a class B amplifier circuit; that depends on the design of the specific circuit, such as how and how much negative feedback is used.
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