agentsmith23

$200, I know that is outside of new Klipsch sub range and I'm not sure how good of a used Klipsh I can get or if I should look into something else.

My system includes a Sony STR-DH800, Onkyo SKF 4800 fronts, Pioneer SP-C21 center, Polk satellites for rear(not sure of model number), and the Polk RM6880 sub. I know the fronts and center aren't matched but when I bought the fronts I had no idea that the center and surrounds aren't available in the US. It still sounds good to me. I want to upgrade the sub to something with a much better low end because the Polk sub doesn't add a lot over the Onkyo fronts, they do bass very well. If I turn up the sub it starts muddy up everything else and it doesn't have an adjustable crossover. So I guess I am looking for something that does lows well (20-80Hz) range and has an adjustable crossover. I am not an expert in audio equipment so I am hoping that explanation makes sense.

I found a Klipsch SW10 II locally for $100 and I currently have a Polk RM6880 sub. Would it be beneficial to buy the SW10 II? Thanks for any possible help!