Regardless of the power rating of your Yamaha, those speakers WILL suck up a lot of power. The more that you have, the cleaner, clearer, louder and less stressed it will sound all things being equal. As previously mentioned, DO NOT bridge an amp into a very low impedances unless the amp is built like an absolute tank. In terms of comparing the Sunfire Signature to your Yammie, that is NOT a comparison at all. I have run a Yamaha M-80 ( their best amp that they ever made as far as most people are concerned ), so i know pretty much what to expect out of the amp that you have. Keep in mind that the Signature is rated for 1200 wpc @ 4 ohms, which is much closer to what your speakers will actually be. For reference purposes, i replaced a bi-amped system consisting of 400 wpc for the top end and 500 wpc for the bottom end with a Sunfire Signature doing 1200 wpc full range. The Signature literally STOMPED the biamped system in terms of clarity, detail, air, etc... At extremely high volumes, the bi-amped system started to get "pinched" sounding due to amplifier compression whereas the Sunfire never seemed to strain in the least and always sounded effortless, even when playing louder than the other system could achieve. The only place that the biamped system was a slight winner over the Signature was in bass slam. Not to take anything away from the Signature, but my "little" Perreaux's will stomp on most amps when it comes to this specific area. While you can use 10 gauge stuff that you just bought for the woofers, I would look for something else to use on the tope section. Try to avoid "zip cord" type wires as they don't do very well with upper midrange and treble response but are fine below appr. 2 Khz or so. Sean
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