I think that the biggest difference that I noticed when auditioning these speakers was that the CLS was a bit more coherent throughout the frequency spectrum than the Monolith. While the Monoliths did go lower, I never felt that the bass fully integrated with the stat panels to where I didn't notice the discontinuity between the bass and stat drivers. You may have to work to integrate the subs with the CLS, but the lower crossover point might make that a bit easier. My ultimate gripe with the CLS was that they didn't play loud enough for me at the time (don't know how they'd fare with rock or large scale classical works, for example). They were very nice for small scale classical, chamber music and jazz. Hope this helps refresh your memory.
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