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I am running Silver i's too. I am using a Bryston 9B-ST to power them. I have hiss from 10'-12', which is worse than you. It is loudest from my C6i center.

As far as clipping, I have only clipped my amp during depth charges on U-571 at cranking levels. I also believe the PSB's 4 ohm impedance is a huge factor, since the speakers are quite efficient.

You probably heard the PSB speaker distort because it couldn't handle that much power, rather than hearing the Bryston amp clip. Usually an amplifier when it clips makes a different sound at the speaker, than the sound a speaker makes when it distorts because it's getting more power from the amp than it can handle...