I have had the chance to hear both the LF-10's and the HPS-1000 sid-by-side with Klipsch RF-3 II's. I first heard the HPS-1000 it sounded incredible, but really boomy. Musically, yeah it's very good for a 15" sub, but I asked the guy to bring another LF-10 into the room and hook it up to a Yamaha RX-V 3000. I used Star Wars Episode I and Dave Matthew's Band to demo. The LF-10's just blew my mind away, at the low frequency's the LF-10's beat the HPS. Even though I expected the HPS to outperform the LF-10's because of the specs, but the HPS just sounded like crap. It dropped of at around 30hz. The LF-10's basically flat out wooped it's butt. They went way way way louder then the HPS, and outstanding at lower frequency's. With out a doubt, I would go with the 2 KLIPSCH LF-10's.
PS I hope this was very helpful. f>------------------
Jim Davis