If your speakers are low impedance, or have an impedance curve that varies quite a bit, both current delivery and output impedance of the amp (damping factor)will have a greater effect on the sound than the amount of watts that the amp puts out.
Class A Watts
Are class A watts more powerful then class AB, or is a watt just a watt. In other words would a 100 watt class A amp struggle with speakers that a 200 Watt class AB amp can handle just fine? I guess current would matter as well. Anyway, I was just curious.