You should be able to get about the same performance increase just by jacking up the center channel input by 3-5 db. That will give you a good idea of what a 2200 amp would sound like in your system if it were feeding the center channel.
He can do that of course but it will not be the same as running a separate amplifier. Looking at the specs on the Marantz page his unit is rated at 100wpc when driving two channels only. Load it up with seven channels and it is probably closer to 50wpc
I have god awful tinnitus so the center channel is critical for me while it may not be for others.
to OP, what speakers are you using as this would give us a better idea of amplifier loads and what you might be able to expect.
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