This isn't really a new feature, as it was available on previous models like the X7200W and 4520CI. To be honest, I consider it essentially a marketing gimmick with dubious real world benefits. The amps are disconnected from the signal input but they aren't "turned off", they just sit there idling with no signal. So maybe there's some tiny incremental benefit in from disconnecting them. But I wouldn't make my decision based on this feature.How does this works?
Can people hear a difference, and how will this be against a Marantz 7704 or 8805?
Personally, if you're looking for a cheaper inroad into separates, I'd rather use the "free amps" in the unit to power the less important channels (e.g. overheads, back surrounds) and get better amps for the more important channels. This hybrid approach where you use some receiver amps + some separate amps is a lot better value.