Hamburger, your sound description of the 1100 series amps is pretty spot on. As I mentioned, the Boulders sound better with some tubes in the mix. I last auditioned the 1160/1110 combo with the APL Hifi DTR-MR transport & DSD-MR dac. The APL dac has a pure Class-A, differential analogue output which employs vintage E182CC tubes and ZNF. That added just enough tube virtues, incl: holography for my tastes. As much as a full tube setup? Obviously no, but "enough" to make me smile .