Solid state AB amp?

It depends on your amplifier,  most A/B amps will play 1 to 5 watts before switching.  So,  it is likely that you will be using class A for 1 watt.  

In that regard, its probably only running off of the driver transistors rather than the output devices.

Two speakers increase of sound pressure by 3 dB, doubling listening distance from a speaker reduce sound pressure by 6 dB. Doubling the amp power output wattage increase sound pressure 3 dB.
Its depends on how far is your listening distance and how much class a power your amp has before it switch to class b.

My amplifier is the Passion 650.  The reason for my original question was how sweet it sounds at such a nice listening volume for a jazz trio. Thought that class A could be running alone
atmasphere would you explain what that means?