There really isn't any comparison. The "suggested" retail price of the 4000R is absolutely ridiculous compared to what you get. I paid far less than retail for mine, and never having even HEARD a real sub before - a round of test tones showed it couldn't do anything substantial in the 20hz range - 30hz was the last tone it played. In that price range you should be able to get something around 20, even a little bit below, especially if you are talking retail.
If I was shopping again (and I'm not - very happy), I'd be looking at SVS, Epik, eD and Hsu. Which is what I was looking at before I bit on the MFW.
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