Class A vs AB

You’ve got some really good speakers, so I think the much bigger question is why you’re considering the 1528s? The amp crossing to AB is a relative rounding error here IMO, and by far the biggest variable is the sonic character differences between the speakers and which is more to your liking. 

I have owned a couple of AB Pass amps. The most recent an X350, I could never tell when it switched. 

What musicians do you listen to?  I listen to a variety of music and not much of what I consider rock is a high quality recording. Some of it is.  I'm listening to Riverside currently and it's pretty good. 

I agree that it is more than class A vs class AB. There seems to be so much more to NP designs, such as circuit topology, simplicity of of amplification stages, and types of amplification devices, that factor into the design philosophy and resulting sound. Pass has amplifiers for many different scenarios. The “lower” wattage Pass designs regardless of A vs AB have been known to perform in ways that are not always common to other designs.

I am an XA25 owner with a pair of 4 ohm nominal Dynaudio Heritage Specials at 85db sensitivity. In my room, at my listening levels, the speakers sound great and I am not thinking about A or AB, but about how pure and musical the XA25 is.

@soix, and all others that posted. Thanks so much, it really did clarify things. I think the crux of my dilemma was spotted by @soix 

I really enjoy my Fritz speakers, I don't think i could ever sell them. They offer me a level of sonic character that I really enjoy. They sound very good at 90db with assoc sub. I would like to find something that reaches above that sonic character offered by the FRITZ. Maybe a little more clarity,dynamics  in the mid-range, maybe a touch above in the tweeter  range? 

The only example I can associate: In my shop I have a very large area to deal with with a CODA 8 V1 amp and some very nice electronics. All rock and roll 90db etc. I used a Tekton DI speaker which was GREAT! But: I though I was missing something from the DI. I wanted more. I called ERIC from Tekton and we spoke at length. He built me serial #5&6 of a special version on his ENCORE line of speakers. ( several lines above the DI's) He knew I owned the DI's and knew my listening was strictly Rock. This NEW speaker is just incredible. I don't know how to describe it. I'm as close as I can be to the actual concert. The dynamics, the CLARITY, it's everything I wanted!!!!  Five times the DI.  I am hoping to find that speaker for this smaller room that doesn't over power it, but gives me everything the other rooms speaker does??? Any suggestions or recommendations  would be  GREAT. Hoping that speaker exists, and doesn't break the bank. Robert