I can tell you from experience that the L1590's were and still are a very good speaker. I didn't own but heard the M15 and they were somewhat a step backwards, a little more pronounced low end. Even the dealer where I bought my 1590's was disappointed, now this was back in the late 80's. The 1590s were very well balanced top to bottom with very natural mids and highs and tight low end. When I sold mine I went up to the Dunlavy SC-IV's. I still use smaller ADS speakers in secondary systems and am still a fan. It's a shame they are no longer around but a good used pair of L1590's go for $800 to $900 and wonderful speaker if your room will support them. As song as you're not looking for boom and sizzle I think they're a safe bet.
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