I was quite unimpressed by the HDVA 600, which should be the same amp as the 800. I prefer the Jot even with the HD800S. I've also had experience with the Mojo and I would expect it to make the 800S crisper, thinner, and possibly drier, the opposite of what I'm looking for in many ways. Frankly I'm surprised it even drives the 800S. The Chord amps we're referring to don't seem to be balanced either. I'm not looking for a $2500-3000 tube amp. This looks like a pretty interesting suggestion. Can you elaborate? Does it make the 800S full while reining in brightness?