Whatta Ya Think About Hsu Research Subwoofers?

I owned a pair of Hsu ULS-15s for many years.
Excellent presentation across the entire band and extremely reliable. I left them powered up 24/7 and never had to touch them. 
I owned a pair of SVS 12" SB12S prior the HSU, and the Hsu's offered a lot more output. Granted, its not a fair fight, but the 15s are not of the one note variety. Excellent in a 2.2 music system. 

I'm a sealed sub guy so can only speak to the ULS-15, but their ported units are well regarded among the HT users. Definitely worth looking into. 

Hello bob540,

     I've never owned a HSU sub but wouldn't hesitate to purchase them based on their very good reviews, reasonable pricing and generous return terms. 
     However, I would advise buying a pair rather than just a single sub.  Based on my experience, a pair of subs will perform and sound about twice as good as a single sub.  Bass is cumulative and having 2 will provide a more accurate, realistic and natural presentation of the bass impact and dynamics recorded on the source content with neither sub operating anywhere near its limit.  
     Having 2 subs running in mono mode, properly positioned in your room and in relation to your listening seat, will also provide the normal multiple subs in a room benefits of the bass being smoother, faster, more detailed and better integrated with the main speakers than a single sub is capable of.  The soundstage normally sounds wider, deeper  as well as more realistic, open and natural.
     Besides choosing a pair of HSU subs that match your physical size and budget requirements, you need to make sure the subs have separate controls on each for volume, cutoff frequency and continuously variable phase, I believe most if not all HSU sub models have these. If your budget is tight, I recommend that utilizing 2 smaller and less expensive subs will perform better than a single larger and more expensive sub in virtually any room and system by a wide margin.
      Useful skills to learn are how to optimally position and configure 2 subs in a room.  I suggest googling the 'crawl method' for positioning and setting the volume and cutoff frequency controls on each sub as low as possible with the bass still sounding good to you (powerful, dynamic, detailed and natural).  Remember, the goal is not to constantly hear and feel the contributions of the bass from the subs but for them only to  supplement the deep bass when the content calls for it.

Best wishes,
     Tim

I own and use 3 HSU subs in my listening room. I purchased all 3 on the used market about 3 years ago. The work flawlessly,and sound great. Other than when we go away on vacation,they stay powered on 24/7. Not so much as a hiccup.

Oops! The models I have,2- STF1’s,1-VTF2 Mk3. My room is 9x13x8.

Hello rocray,

     Yes, 3-4 subs properly positioned and configured in a room qualifies as what's called a distributed bass array (DBA) system that's been scientifically proven to be one of the most effective sub-based bass solutions that can also be utilized in any room and with any pair of main speakers, even those very fast and detailed speakers considered very difficult to integrate subs with such as planar-magnetic and electrostatic type speakers.
     In my experience, a3-4 sub DBA system will perform and sound about twice as good as utilizing a pair of subs. Adding 1-2 subs to a pair of subs and positioning them in a distributed bass array configuration results in a further improvement in bass performance in terms of speed, smoothness, detail, power, impact and dynamics.  It will also extend this near state of the art bass performance  throughout the entire room, not just at a single listening position as is the case with using a pair of subs. 
     I utilize a 4-sub DBA complete kit system, an Audio Kinesis Debra system, with results I find very accurately described in this Absolute Sound review of the Audio Kinesis Swarm 4-sub DBA complete kit system (which is identical in price and performance to the AK Debra system but the relatively small subs are more rectangular than the Swarm's squarer shaped subs.):

https://www.theabsolutesound.com/articles/audiokinesis-swarm-subwoofer-system/

     My advise is that multiple subs will provide significantly better bass response than a single sub is capable of providing, no matter its size, quality or price.  If your goal is to optimize the bass performance in your system, or prefer near state of the art bass performance throughout your entire room rather than just at your designated listening position, then I recommend using either an AK complete kit 4-sub DBA system or a custom 3-4 sub DBA  system utilizing your choice of subs.
     If you want to learn more about the effectiveness of the DBA concept, 3-4 sub distributed bass arrays and in-room bass response in general, you can google " distributed bass array concept" or "distributed bass array system".

Best wishes,
     Tim