+1 Jeffbij
I had ML13 and upgraded to ML15 driven by a Classé CA2200, really nice combo at least for me (tried Pass Labs, Luxman, Parasound, Krell). They do need a lot of juice! Starting on the ML9, the woofer is much better integrated with the panels. I don’t need a subwoofer with the 15 nor did I with the 13. The type of amplifier will actually change the woofer response as confirmed by ML. One perk: Customer service is top notch.