Hello OP. I own both a Verastarr SSA-644 and Studio 6.4. These amps have plenty of headroom for dynamic passages backed by more then just total watts as they have massive power supplies with plenty of capacitor storage so the current to drive demanding speakers or taxing musical transitions is readily available. The SSA-644 is a Class A amplifier that switches over to AB when more grunt is needed. What I notice most is that the Class A really opens up the detail on the quieter passages (neutral, natural, musical) and there is no noticeable difference when the louder more demanding passages need the grunt of the Class AB as the amp has all the authority that it needs the moment it needs it. I have listened to large high wattage room heating all Class A amps and once the sound level gets so high the finesse of Class A is lost to the overall sound pressure level in the room which in my opinion means a 300 watt all Class A amp really isn't needed unless its your primary heat source!
These amps are well built with premium components and way over built PCB boards and awesome power supplies. The amps are well thought out as well as laid out properly with attention to signal path detail.
So if you get an opportunity to buy either an SSA-644 or Studio 6.4, I am fairly sure the owner will let you listen to it before you buy it if you both are local. And if not local, I am just as sure that if you purchased one on Audiogon and ended up not wanting to keep it that you would have no trouble turning around and reselling it again on Audiogon.
If you have specific questions about either amp, I would be happy to attempt to answer them.
These amps are well built with premium components and way over built PCB boards and awesome power supplies. The amps are well thought out as well as laid out properly with attention to signal path detail.
So if you get an opportunity to buy either an SSA-644 or Studio 6.4, I am fairly sure the owner will let you listen to it before you buy it if you both are local. And if not local, I am just as sure that if you purchased one on Audiogon and ended up not wanting to keep it that you would have no trouble turning around and reselling it again on Audiogon.
If you have specific questions about either amp, I would be happy to attempt to answer them.