Just got a new power amp

kijanki

"Fully Balanced Amplifier" term refers to amplifier consisting of balanced input followed by two separate amplifiers - each driving one terminal of the speaker.

Of course you are free to define terms for yourself anyway you like. But a "fully balanced amplifier" doesn’t require two separate amplifiers. You simply do not know what you’re talking about and your claim conflicts with the manufacturers' published literature.

An amplifier using balanced inputs, balanced circuits and providing balanced outputs is, by definition "fully balanced." It’s as simple as that.

@cleeds   This amplifier has only balanced input.  Circuitry between input and output is not balanced and output is not balanced.  Output is single-ended, with Mosfet bridge to switch "flip" direction of the speaker.

@cleeds   Input stage can be either "balanced" or "true balanced".  "True" refers to inputs that are not referenced to GND, like in instrumentation amp or transformer.
When pre output and amp input are both "true" balanced signal to shield capacitance in cable disappears, since signal is not referenced to GND.  Example of such configuration is output transformer to input transformer.

Amplifier can have balanced inputs or balanced outputs (to increase power), but "Fully Balanced Amplifier" means that balanced input section (instrumentation amp or transformer) is followed by two separate amplifiers, each driving one speaker terminal.  Such configuration helps to improve common mode noise rejection and reduces even harmonics.

That is at least how I understand it.  Other terms like "fully balanced input" are also used, not to mention "rms power".  Most of the time I understand what they mean.
 

The PS audio s300 is supposed to have balanced inputs and outputs, but it isn't quad differential.

@invalid  S300 output is supplied from single supply only.  To achieve net zero output at 50% duty cycle speaker is "flipped" between V+ and GND by bridge of 4 Mosfet transistors.  Some modules achieve it with dual +/- supply and only 2 Mosfets.  To me it is more "bridged" than "balanced", but it doesn't matter, as long as we know what it is.