*PLEASE don't let me start a flame war*
I've owned both Hsu and SVS. The Hsu was the old top of the line VTF-3 HO Turbo. The SVS is the current PB13-Ultra. Here is my take on the two.
First, my screen name Gimpy Ric is because I'm a C 3-4 Quadriplegic paralyzed from the upper shoulders down. I cannot scoot around on the floor with my Rat Shack SPL meter looking for humps and nulls. And I flunked calibration class so both subs were setup in stock trim.
My HT is my master bedroom man cave with all my computers, stereo, ham radio gear etc. is setup. I spend a lot of time in here, and listen to music non stop most days.
Both subs are/were in the same location, between the mains, the only place for them. Build quality of both subs was excellent. I owned the Hsu first for a little more than 9 months. I miss that sub, my first big buck serious sub, just kinda had a bond with it. The Turbo port extensions were ugly, but took her down to 16 Hz, useful for some movies. That sub sounded a bit better with music than the SVS at lower volume levels. And until it ran out of gas, which was extremely loud, it always sounded good with music.
Then I got the bright idea that I needed a PB13 Ultra in Piano Black to match all of my Aperions. So I put the Hsu on Craigslist and sold her locally, low miles and all. I had to get in line with SVS to purchase the Ultra, about a month and a half. Then she arrived all shiney Black and looking like a Corvette compared to the Hsu. I have the metal grill, and it looks cool with the Piano Black finish. Anyways, Having failed calibration class, we just set the gain by ear after several hours of listening to favorite songs. The Ultra sounds good, but to match the Hsu on music, you have to turn the music up louder than you did with the Hsu. Not reference (read concert) level, but fairly loud.
Back to that Corvette reference, the SVS has goobs and goobs of headroom in 20 Hz. trim. She needs to rev up a little to get going. The Hsu was happy at idle, but ran more like a sedan, not having the insane output of the Ultra.
I'm sorry that I can't recommend one over the other, I've only heard mine, probably in the wrong spot, and un-calibrated. But I do hope you've enjoyed my short story
