The living room is approx 13' x 20'
I neglected to say that after looking at the plate amplifiers on Parts Express, I supposed I could buy a good plate amplifier for less than $120 and put it in place of the stock amp in the Polk, if the plate dimensions are close.
However, the suspicion would be that the speaker in the Polk might not be able to handle a lot more power, would have to research that.
Yeah, I have to hook up the klipsch and listen. The problem is that there aren't any laboratory tested reviews of budget subs such that you could do a good comparison.