I have one pair of Polk DB675 and a PPI PC2200.2 amp. Is this amp sufficient for these speakers? Is it ok to run these speakers at 2ohms? Please help!

It's to much amp for those speakers especially at 2 ohms. Those speakers are RMS 60 and a peak of 180 your talking about sending 200 watts to them continuously. If you wanted to run them at 2 ohms youd have to parallel them into just one of the channels.

But everything I can find on the net says that the amp is rated at 50Wx2 at 4ohms. Is that too much?

Oh, then no thats just about right on. I looked it up and found what I found. Are you planning on doing two set's of the amp at 2 ohms? <BR> <BR>I have them right now with 60 watts going to them and they sound good but I'm upgrading to ARC Audio seperates.

No, I just have one set of tower speakers and that is what I am using that amp for.