Me thinks you're right Dukk.
Although each amplifier will "react" differently with different speakers, it goes without saying it will sound "different".
The speakers you purchased probably do sound their best when coupled to "Any" class A/B amplifier. As for quality of manufactured products, there is more to it besides sound quality, such as build design, topology, and quality of parts.
You will also notice a difference in sound when changing interconnecting cables and speaker wire.
So if you plan on getting a nice amplifier to match your speakers, may as well finish the "ensemble" with quality cables and quality installation, because you're putting it all in a very noisy environment.
I also agree that amplifier classes do sound differently, as each will use either Voltage driven amplification, or current driven type, where class D affect the unit's Power Supply .
..But that's just my two cents worth.., on second thought, make it a nickle. ;-)