I'm playing the M2s full range spliced at the EP400's 'High Level Inputs' (Speakers IN) from my Tube Integrated Amp. There is no filtering provided to the M2s by the EP400 nor is there any EQ provided by my Tube Amp - no processing whatsoever.

I would have preferred to have filtered 'Speaker Level Out' like my twin Velodyne subs have, but the EP400 doesn't have that feature.

Anyway, I've never heard any nasties from this system since I got it last summer as I surmise that the M2s roll off naturally below their lower limit & don't suffer any negative consequences. While I've never felt any bass response deficits, I believe that twin EP400s can only enhance the listening experience I would think...

TAM