Interresting amplifier question...


Bronze Member
Username: Sq_junkie

Anchorage, AK US

Post Number: 24
Registered: Jun-05
I was just wondering what the difference between a class A/B and a class D amp is?

Gold Member
Username: Invain

Michigan United States

Post Number: 2920
Registered: Aug-04
When a class A/B amp is run at low volumes, it works as a class A amp, which are the most accurate, but also the least efficient. When the A/B amp is run at high volumes, it operates as a class B amp. Class B amps produce more distortion than class A amps, but are also more effecient. Overall A/B amps are more accurate, or have less distortion than class D amps, but are also less effecient.

Class D amps are much more effecient, but the sound quality is much lower than that of A/B amps.

Bronze Member
Username: Sq_junkie

Anchorage, AK US

Post Number: 26
Registered: Jun-05
Then why are class D amps so much more expensive? One would think that better accuracy would mean more money.

Silver Member
Username: Mikechec9


Post Number: 283
Registered: May-05
in most simple terms:

where "-" is the signal,


class A/B= -------------------------------------

class D= - - - - - - - - - - - - - - - - - - - - -

that's why D is currently only used in bass applications. because you don't notice the gaps.

Silver Member
Username: Geekbike

Post Number: 210
Registered: Dec-04
For equal power class A/B and D amps, class D are always cheaper.
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