Not too familiar with Asperion. How much do they run, and how have you liked them?
Have you owned any other subs, and how does the HSU compare? I keep reading that HSU subs have a more visceral feel than other subs - one of the main reasons I went with it. Do you agree?
I've owned two other subs. My first (bought back in the mid 1990s) was an Infinity (I forget the model). If died a number of years ago and was replaced with a relatively low end JBL (I don't think I paid more than $250 for it). The Hsu is in a completely different universe compared to those subs. I like your use of the term "visceral" as that is the exact term I have used to describe its impact. When you get the right scene in a movie, the sound just hits you in the stomach. Yet it's still very tight. My cheapo JBL can put out a fair amount of SPL, but it is really boomy. The Hsu hits you where it counts but still lets you enjoy the rest of the sound. With music, there is definitely a solid rounding out of the lower frequencies. However, if all I listened to was music, I would not likely have spent this much on a sub as the Aperions acquitted themselves well.
Aperion Audio is a locally based (to Portland, OR) internet direct speaker vendor. Here's a link:
http://www.aperionaudio.com. I use the word "speaker" pretty specifically because although Aperion makes subwoofers, it isn't their specialty. They are sort of the flip side of Hsu and SVS, which are specialists in the subwoofer field but who also sell satellites to complement their subs. I have two Hsu HB-1s and like them. But the sound quality doesn't match the Aperion speakers. Of course, the Aperions cost a lot more. They have two main lines of speakers (Intimus, which is older, and the recently introduced Verus series). Each of the main lines is divided further (the Verus line has the lesser Forte subline and the top of the line Grand). The Verus Forte towers run $500 each. The satellites are $175. The Verus Grand channel is an eye popping $700 (eye popping for me anyway). I ended up going all out for the center channel because I will be using my system primarily for movies. And the Verus Grand Towers are just too damned expensive.
I ended up going with Aperion primarily because they are local to me and I was able to go down to their showroom and audition the speakers for a few hours. I left the showroom confident that, given the money I had paid, I would be satisfied. Having listened to the speakers for 45 days now, I don't have any regrets. But I am not one who spends a lot of time second guessing purchases like this. There are many out there who would wonder if a set made by Axiom or Klipsch might have sounded just a little better or provided a little more value. I don't get into that game too much. I was ready to part with a certain amount of money and the Aperions sound really damn good. Case closed for me.
Even if you don't live near Portland, Aperion is worth a try since they offer a free 30 trial and pay shipping both ways if you are not satisfied.