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Hello. The AVR-S660H can support the use of one pair of 4 ohm speakers, but that depends on which Martin Logan speakers you have. Impedance ratings are typically only average measurements, and therefore do not tell the whole story. Subsequently, additional information is required for a more conclusive answer to be provided. If you have more than one pair of 4 ohm speakers, I would suggest looking at the AVR-X3800H. If your speakers prove to be quite demanding (such as Martin Logan electrostatics), you can always add external power amplification.
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