Originally Posted by boyer
...Has any on here had issues with the HSU?
I can only tell you that I bought two ULS-15's (DualDrive) in 2013 for a 2-channel satellite/subwoofer music-only (no HT) system. Less than 3 years later in 2016, the amp in the right sub failed. I returned the amp for repair. About a year after that in 2017, the amp in the left sub failed. I have since moved in a new direction.
Judging by the posts in this forum, my experience may be an anomaly.
Good luck, and happy hunting.