can I run 2 subs in my surround setp? any quality loss?

Have you calibrated your current set-up? If not, I would suggest you do that first before considering whether to add another sub (and it's cheaper).

Adding a second sub can be a good thing, but with some caveats. One is that you're dealing with good subs in the first place (I'm not familiar with the specific models you described). A single good performing sub (and sized adequately for your room) is going outperform two lesser subs. Combining subs can help smooth out the frequency response in your room, but that typically entails calibrating both subs - which can be very difficult with two different subs, vs. two identical subs. Based only on your description of the subs (nice Infinity sub, cheap Polk sub), if you're set on buying another sub, I would consider another Infinity first (assuming you've done the calibration on your current set-up and know you've got issues that might be solved with another sub). Hope that helps.

Ross

Most knowledgeable techs recommend not mixing dissimilar subs. IMO you need to find out exactly what accounts for the "lessened impact". You might find that there was a resonance in the smaller room that is not present in the larger one.

You can try increasing the level of the sub or repositioning the sub or both to get more "impact". Try that before investing in a 2nd sub. If you decide to go for a second sub my recommendation is to by an identical one to the one you have and collocate them.

Maybe you should consider a buttkicker LFE instead to really "feel" the bass kicking and thumping instead of a 2nd sub.

Buttkicker kit on Amazon