OK, real answer.

80s vs 60s
The M80s will play a lot louder if you have a really big room. They also deliver more detail in the mids and highs (noticably more in a/b listening but not a huge difference) and definately deliver more bass.

Vs. competitors
Well, there are a TON of speaker manufacturers out there. Did you have any particular brands in mind?

Fred

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Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!