The difficult room is exactly why I thought Lyngdorf. Concrete, drywall and glass have to be about as bad as it gets. As for model I think the TDAI-2170 would work, but again I'm not sure. I have read a few have preferred it's sound over the 3400. I guess the biggest thing is I haven't heard any Lyngdorf systems and have no idea how it would mate with Magico. The nearest dealer is about 5 hours away.