The 7100 cannot be bridged, so two 7100's cannot be combined into a single 7-channel amp. If the 100W/channel of the 7100 wasn't sufficient, I'd recommend returning it within the 30-day demo window and ordering a 770 instead. Or, you might be able to get some feedback from owners of similar speakers here in the saloon, see what amps they are using.

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gonk -- Saloon Links | Pre/Pro Comparison Chart | 950 Review