Kord, no vote, but my thought would be inclined toward no higher than "not much". If you're not going to listen to symphonic or other music with very low bass from instruments such as pipe organs or large bass drums, there's very little that the M80 doesn't cover well. On the type of music that you mention the lowest "standard" instrument note would be 41.2Hz on a double bass. I've found in my room that even the M22 can give usable, although low, output there. The M80 should be fully satisfactory.

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Enjoy the music, not the equipment.