I've had no issues with my (recently sold) Hsu sub. Whenever I used it for music it would sound extremely good, I use to use it with the Focus 160s regularly. Now with the 260s I never use it for music. I'm currently going to buy the Hsu 15" sub. My old VTF2 MK4 I sold to a friend and he has DM2/6s and we got the 2 dialed in and the combination sounds exquisite. Crossed over at 60hz you couldn't even tell the sub was there... And I was playing some deep bass tracks, the low end just was there without being noticeable. No issues with speed, control or pitch.
Same for my Hsu vtf3 mk3. Exceptional sub for music and movies at a great price.
Sent using Tapatalk since the mobile version is still