What Subwoofer?

My question is the subwoofer. I have an older Velodyne CHT12 which I am currently using and it sounds ok, but is only rated at 170watts. An audio friend suggested I look into a Polk PSW 505 which is rated at 300 watts. There is a refurbished one on e-bay for under $200.
Is the PSW as great as suggested? What other Subwoofers would work well with this system? any suggestions. Also would you go
refurbished with a subwoofer?
My system is a Denon avr 4520 ci and Polk rtia7's bi-amped, csia6 by-wired and rt600i in back.
Post edited by invester on

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