Best Subwoofer for $500 or less

[bargainseeker]

Hello.

I am putting together a budget A/V system and would like some input regarding which subwoofer I should buy for $500 or less.

The receiver will be either the Denon AVR1705 or Yamaha HTR5750.

Any input would be greatly appreciated.

Thanks

My recommendation would be the SVS PB10-ISD. I have owned one since it first came out two months ago and I don't know of anything else in this price range that will outperform it. Some reviews on it are here and here.