Most audio experts know a speaker and its amplifier should never be plced in the same space. If you count yourself in that place you have to audition Audioengine’s new N22 Class AB amplifier. That goes twice for anyone searching for a no non sense affordable priced headphone.
Many amplifiers in this cost variant are Class D switching amps that changes an input signal into a series of higher voltage output pulses. As this pulse frequency and its harmonics adulterate the source signal a passive filter must be there to get rid of them. This type of amp is generally controlled by digital circuitry that includes more distortion in the form of quantization mistake as the inside signal is changed from analog to digital. That is not to say that all Class D amps are wrong.
TBI Millennia MG3 for time being is a very nice product. Class D amps are also generally very good. They use very little power than other types of amplifiers and want little heat sinks to emit heat. In fact few small Class D amplifiers such as the MG3 can work on batteries.
The external devices in a Class A amp get power the whole time in which the amp is turned on and the amplifiers external signal is an exact scaled up copy of the input signal. Audiophiles compliments Class A amps for their fidelity but these types of amps are much expensive to draw and build and they’re very good wasting roughly half the power they use.
The external devices in a Class B amp get power only when they’re active amplifying the input signal and they amplify only half the input signal so a Class B amp is very efficient because its output devices are closed half the time. But this similar features make relative changes so Class B amps are not very useful for normal applications.