AVS Forum Addicted Member
Join Date: Jan 2001
Location: upstate NY
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It's just the Marantz terminology describing their proprietary analog amplifier circuitry. By itself, it doesn't really make any audible difference when comparing with other receivers in the same price range.
In general, it's appropriate to ask questions about specific receivers in their dedicated threads.
Marantz SR7009 avr + MM9000 amp --> Atmos 7.1.4
Fronts=NHT 2.9+AC2, FH+TM=DefTech PM1000, LCR+TM amped