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Join Date: Feb 2016
Location: Danbury, CT, USA
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Why do you compare those two?
The X6500H is a much more expensive AVR than a VSX-LX504.
Either seems excessive for a 5.2 system.
The X3500H that JD recommends seems like a reasonable choice. It's the lowest-end Denon model that includes the Audyssey XT32 room correction software. (That's the best retail version.)
The difference in power between an X3500H and an X6500H amounts to roughly 1dB. Barely audible.
If I wanted to inflict maximum annoyance on my condo neighbors, I might consider a Pioneer LX-SC model. They have Class D amplifiers, which implies the least tendency to overheat while driving 4 ohm speakers hard. There are a few models available as refurbs at accessories4less (and one available as new).