dont exhibit the maladies you ascribe to class d amps. and as you know the spectron is d class as well (from the inventor). my friend had the cia d200s driving the mg12s to great effect plus von schweickert himself demoed his $50k speaker system with them which mightily impressed ME.
using the spectron on only the bass tells me that you have too much expendable cash. i'll swap you my adcom 555II for it. heheheheheh!