Jim Salk hooked his SC12 babies up to the ModWright amp and pre just so he could listen to music he was familiar with. As was stated, he believed the AVA gear had more "air" in the higher frequencies. I can't tell you what that means. It all sounded sweet to me.
To be honest, I'd be willing to bet you could hook those SC12's up to an old Kraco car stereo amp and they'd still sound like heaven.