Matt ... Most of the sonic differences in amps is the ability to deliver a stable current level into the speakers in a manner in which the speaker can be driven to its potential.
A great example of this has been NAD amps over the decades. When I was selling audio full time in the 1979 to 1982 years, we used to compare a NAD 3020, 20 WPC amp, to the 100 WPC receivers from Technics/Pioneer/Kenwood/Hitachi ...
The NAD mopped the floor with them.
In your particular case, I doubt changing amps will make any difference in sound quality. Anthem amps are high current, quality products.
A question for you ... you do not have a DSP for your 1100's?
