When the Def Tech's first came out, they were meant to compete with the Mirage M series. You may be confusing the Msi series with the origional M series. The origional M's were very laid back and forgiving. They really went a bit too far in that respect. The si upgrade really balanced the speakers out quite a bit. If you could, though, you may be happier with the 3 or the 5's. I would still pick the 7si's over the BP 20's, but if you really want to see what the M series is all about, the 3 and 5 are worth it if you can find some. I think they just came out with the 7's because a lot of people didn't want such a big speaker.
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