Purely anecdotal: I have one of the 4 channel amps. I have modified it IAW the Hypex NC502MP datasheet to run each amp module bridged. Been running it that way for about a year now. No issues to report.
I finally completed the finish carpentry on the BFM Tuba HT that I "finished" (Read: built, prepped for paint, put it in the room for "testing", and never bothered to take it back out of "testing") 3 years ago.
1. Ultimate Ears Reference Remastered. It doesn't match the Harman Curve, but I do like the sound. The comfort of CIEMs is also hard to beat. Used these for many years while I had a desk in an active aircraft hangar where loud tools were frequently used.
2. Shure SE215. I had these before the...
Take a look at Front Panel Express for custom front panels as well. You would have to do it yourself using their free, non-parametric CAD program, but it works, and I haven't had an issue with their panels.