“Can I biwire this amp to double the power for KEF R11?”
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Hi 721, Bi-wiring is possible with the MM7055, but it doesn't double the power. Bi-wiring doesn't usually result in much of a difference as it only involves two pairs of speaker wire from a single terminal pair at the amplifier end. At the other end it has one pair connect to the upper port (tweeter) on the speaker's terminals, and the other to the lower (mid/bass) terminal port. Bi-amping is also possible. This means you will have two of the MM7055's output terminal pairs per speaker. This would make more of a difference as you effectively have one power amplifier channel per drive unit with each speaker. You will need to make sure your pre-amp allows for this many feeds (four) for the left and right speakers. You won't need any more power than is on offer though - your KEF R11s have a sensitivity rating of 90 dB. In a medium-sized room they need only a few watts to go very loud.
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