That’s great to hear. I’ve heard of other manufacturers that won’t touch their older gear. I have three older HSU subs that are still alive and kicking.
Great service from HSU Research
Just FYI, my old HSU sub needed servicing. I emailed HSU (Steve) and got a quick response back, agreed to sent them just the amp itself and it was fixed and back in my hands in a week or so. Very fair price too. Good job HSU!