Pros: Full sounding speaker, detailed mids and highs, able to hit low bass felt in the floor.
Cons: Require lots of power to sound their best and to produce low bass
Down the line, I added an XPA-3 power amp, 200wpc. These M70's started to produce some detail I hadn't heard before, 2ch listening was a lot more enjoyable. H.T. was awesome.
Further down the line, I added an XPA-2, a 300wpch amp, BINGO, these M70's responded to this power like it was a brand new speaker, it produced bass you could feel, mids and highs that were starting to rival my RTiA9's, I was impressed by the sound these "cheap" speakers were making with that much power feeding into them. I hated to sell them, but after I demoed them on the power amp, I got my asking price easy.
Final word, feed them and they will play.