In my audio experience, the main issue with amps is the unpredictability of how the output characteristics of an amp will affect the acoustical result of the loudspeaker. An effective way to reduce impact of an amp’s sound signature and get consistent and very satisfying results even with cheap amps is to let it drive directly the easy load of the speaker, removing any crossover components downstream of the amp. The influence of cable and connector impedance will then also vanish to almost inaudible levels. You then have to invest in multiple amps and do the equalizing and crossover upstream, but after having heard the results of doing so, you will probably never want to go back to playing the insane, frustrating and never ending quest of finding the "perfect" amp that will blend best in an inherently imperfect system architecture.
/patrick
/patrick