I use the Fluid Audio SRI-2 to control my active Event2030 and Avantone Mixcube monitors in the studio. I have connected the main monitors to output A, Avantone Mixcubes to output B.
All the inputs and audio interface works great, I use it as a mixer between 2 sources (DJ mixer and two macbook), I sometimes connect my iPhone to the front multi-jack and everything works exactly as it should.
The headphone amp also sounds great.
My only complaints are that it heats up a little too much for my comfort even when inactive (but no issues whatsoever) and aslo that I would love to have a second headphone app.
I'm VERY satisfied with this product, it solved sooo many problems in just one device.