"These folks design superior products for the masses, price them reasonably and support their customers like few others. For sure they deserve more visibility. I have yet to review a single thing from HSU that wasn’t both inexpensive and impressive, and the VTF-TN1 is certainly no exception. Not sure how this company continually does that, but I’m glad they do."
https://www.hometheaterforum.com/hsu-research-vtf-tn1-subwoofer-review/