I heard the Cremona Ms a few months ago powered by a Marantz PM8004. It's the lowest-price Marantz integrated that uses their HDAM gain circuit. Even with this 70 wpc $999 amp the Cremona Ms sounded fabulous. The Marantzes with the HDAM circuit are from their Reference Series made in Japan. The HDAM circuits are proprietary gain modules that provide as much as 75 dB gain each, with very wide bandwidth and very low noise. Even the PM8004's amp section has an S/N ratio of 125 dB. The 15S2 is a few notches above the PM8004, and should be a very good match. If you Google around, you'll find that these Marantz Reference Series amps are extraordinarily neutral and linear, yet smooth and musical without of hint of edginess or sterility.
I played the opening Diana Krall's "All or Nothing At All," which starts with a rapid upright bass intro by Christian McBride. The humble PM8004 had total control, speed, extension, and fullness of that passage (and the rest of the song), something I would not have expected from a $999 integrated amp. The 15S2 would be that much better. There are several reasons this combo impressed you and I think the Marantz is one of them. The Cremona M is easily my favorite speaker anywhere near that price too.
I played the opening Diana Krall's "All or Nothing At All," which starts with a rapid upright bass intro by Christian McBride. The humble PM8004 had total control, speed, extension, and fullness of that passage (and the rest of the song), something I would not have expected from a $999 integrated amp. The 15S2 would be that much better. There are several reasons this combo impressed you and I think the Marantz is one of them. The Cremona M is easily my favorite speaker anywhere near that price too.