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Daddyo, the 665w is not a model number, it is the wattage rating of the receiver. Same unit, Best Buy has a habit of throwing in the wattage next to the manufacturer without explanation!
Sorry, there was a problem. Please try again later.I'd suggest you google the model numbers you want to compare... Otherwise, contact Yamaha or a dealer local dealer that handles Yamaha receivers. You can get most of the info online by just typing in the model number and the word "specifications". The wattage difference is miniscule. There may be, however, some difference in the features, and those differences will be easy to find just by going to the manufacturers website.
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