Forgive my ignorance but is it the case that some light weight class d bass amps/heads use common power amp modules, and I suppose, their corresponding power supplies? e.g. the B&O modules mentioned. So debate about the relative virtues of amps x,y, and z are in fact only really comparing the preamp stage, which itself is only really about the overdrive/compression, 'baked-in' eq contouring, and eq control elements?