4yanx, sorry for misleading you. I was comparing the virtues of separate versus integrated subs. The 5A subs cannot be improved on IMO.
Pubul57, the search never stops! (:-)
My next step is addressing power and conditioning. I am currently running 2 Richard Grey 400s in series, with the pre on the first and the CD on the second. The amp and subs are direct. Everything is driven off a single 15 amp circuit with nothing else on it. The 15 amp circuit is a very short run (15 ft.) to the main.
Frankly, I have virtually inaudible ambient speaker noise (even without the RGs), and such great performance that I can't imagine that I can improve on it. Is it possible that the all ARC, all balanced equipment is so well designed and so compatible that any power issues are accounted for?
However, based on AGON reviews and given the reasonably low cost, I can't see any down side to adding dedicated circuits. I would put 3-20 amp circuits in (1 for the amp and 1 for each sub), and 2-15 amp circuits in (1 for the pre and 1 for the CD).
Have you any experience in this area?