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Join Date: Jan 2001
Location: upstate NY
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If your Adcom amp worked with your 7001, it should be fine with the 7007.
The major amp "incompatibility" that I'm aware of is simply the use of a high-gain amp. A high noise level (other than hum) is usually indicative of faulty equipment. Of course, a high-gain amp will amplify noise just as easily as it amplifies sounds you want to hear. Emotiva's XPA series (which has 32dB gain) has been mentioned occasionally in this regard. The primary symptom is that all of Audyssey's trim levels peg at -12dB. One relatively easy fix that people have used is to insert 12dB attenuators between the receiver's preamp outputs and the inputs to the amp. Some amp designs have adjustable gains and don't need external attenuators. This problem is not unique to the 7007, though.
You might want to consider waiting for this year's SR7008, though, since it includes the highest version of Audyssey (XT32), while the 7007 has "only" the XT version. The SR7008 is scheduled to be available by the end of July.
Marantz SR7009 avr + MM9000 amp --> Atmos 7.1.4
Fronts=NHT 2.9+AC2, FH+TM=DefTech PM1000, LCR+TM amped