I posted earlier in this thread about the RAAL SR1a and the VM-1a tube amp as being the very best I have heard. That is still the case, but I was flipping a coin this weekend as to whether to sell the VM-1a tube amp. I am not selling it.
The reason being that I burrowed the RAAL Tl-1b box ($800). I plugged that into my CODA #16 amp and wow, it was ALMOST as good as my $7K VM-1a amp. In the past, nothing came close to the SR1a and VM-1a combo. However, now for 2-channel people with great amps, you have a solution to drive the SR1a.
I am getting a Peachtree GAN400 amp this week on a home trial and I will use it for both 2-channel with my office Magnepan LRS+ and the RAAL SR1a via the Tl-1b interface box. I think it will also be excellent.
Another great thing wit this Tl-1b box is that I am able to use a 25-foot cable from the amp to the TL-1b and then use the expensive RAAL Star 8 headphone cable to the SR1a. I am able to listen in my guest bedroom while connected to the 2-channel system in my office. The long cable does not degrade the sound.
BTW - a few years ago there was a thread on the BACCH system. I posted something about getting that system setup for about $5K if you are able to install the software yourself on a MacMini.