Subwoofer HELP

I have`recently bought a pair of M-Audio BX5 monitors. However, after working with them for a couple of weeks and reading various articles on the net, they could certainly do with an additonal sub to add depth to the bottom end.

As I have spent up for the moment, I am after suggestions on a a decent good value cheap sub that will do the job, if such a thing exists. It will of course have to integrate with the pc/BX5 setup.

Any ideas guys? ???


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