Best SS Amp with tight clean bass

For tight bass (and damned good performance in general) without breaking the bank, try ATI. The 1502 can be had for about $400 or less, and the bass is rock-solid. Best I've had in my system, actually.

Then there's always McCormack

I don't think you'll be able to tighten the bass up with cables and amps - not significatly anyway. You might mess around with placement.

My reaction is to get new speakers if they are the problem.

If not, you could get an audiophile quality subwoofer with a bypass filter to reduce or cut-off the low bass signal going to your main speakers.

Otherwise, what is your budget for an amp?

I disagree with the theory that amps can't tighten up the bass in a system. I went from a Yammy HT receiver to a Quad 909 and the change in bass was dramatic. Needless to say everything was a dramatically improved.

Dritchey,

We need a bit more info. What are you currently driving the Polks with? The Rogue? Do you have a budget? What is the rest of the equipment in your system. What is your room size? Have you tried changing the speaker placement?