Do high dollar mono blocks truly improve the Sound Quality over the mid tier amps

I also agree that quality DSP is a game changer.  My Weiss Helios has many ultra high quality DSP features that are extremely useful.

The Class D's also offer a viable alternative as @audioman58 suggests.  Low energy consumption and light weight.features are very compelling. 

@skinzy Its not just low heat and light weight! Class D offers design criteria to the designer that also allow for some very nice distortion characteristics.

In case you are not aware of this fact, the difference you heard between amps when you upgraded was the difference in the distortion signature of those amps.

Class D offers a means to keep what distortion is made quite innocuous to the human ear. So if they are designed properly they can be very musical, erasing the advantages that class A or AB operation used to hold.

@skinzy

If you want to go crazy, a pair of darTZeell NHB-468s is for sale here on Audiogon for a "mere" $129K.

Michael Fremer of Stereophile did a review, matching them with his Wilson Alexx and apparently loved them. His article also discusses various monoblocks he has paired with this speakers.

I still favor quad amping with 4 Classe Deltas before I did this, though.

Atmosphere. When are you going to be coming out with a new even better model Gan Fet amplifier ?

Supposedly,  mono blocks have more umph to give as well as better separation and are  quieter.  I currently have both and I’d be hard pressed to tell the difference.   Each brand has their own strengths, but power has never been a problem.  Separation is harder to define, because all three of my amps are of different designs. The integrated is SS(Hegel H390), the Acoustats have SS inputs and tube outputs and the BHK 300’s are the exact opposite, tube inputs and SS outputs.