I don’t really know or care much for specs. Voicing of any component is, to me, most important. For a designer to be a musician is not necessarily prerequisite but it helps. Vital is that the designer not only needs to understand what music sounds like but is able to voice their “instruments” reflecting that knowledge. Then, ultimately, an amp/speaker combination needs to reflect the taste of the listener. Obviously, an amp can only be evaluated when powering a speaker-the “two hands clapping” in any system.