Joe_coherent, Have you compared the Marsh a400 to the Belles 350A? I know that the the Belles 350A is a winner. I don't know much about the tha Marsh a400. But I have had exp. with the the Belles 350A. The Belles 350A is the greatested solid state amp I've heard. I'm a tube freak for the most part. The Belles 350A sounds as close to tube as I've heard. The Bel Canto Evo is another solid state amp that is up there.