I've heard the 432 and 336 side by side for extended periods. The 336 is head and shoulders above the 432 in almost every sonic category. In my opinion, the 4 series amps are simply a Proceed amp with a Levinson faceplate; hence the much lower price compared to the 3 series amps. Anyone noticed how similar the interior of the 4 series amps are compared to the Proceed; the exterior as well? Believe me, the 4 series amps sound like the Proceeds as well. For theater - great; for the discerning two - channel enthusiast - avoid the 4 series at all costs.
