This is a response related to this thread that I wrote for www.audioreview.com. But their server was constantly down so I thought I would drop it in here because it relates tot the transformation from bad to good from using Vibrapods on two Infinity HPS-500s I own. So that as a backdrop here is the thread:
I was initially disappointed in this sub's lack of musicality (is that a word) in my system. At least it integrated poorly for music. I usually just shut it off. I did not think this sub needed any help with dampening, in part, because it was placed on a concrete basement covered with tile. But immediately after placing the Vibrapods (But if you use 2 #5 Vibrapods under front feet and 2 #4 Vibrapods under rear feet a miracle happens. No kidding. I have been an audiophile for 3 decades and it is rare for such a musical transformation to take place for so little money. You lose that fake added bass from the cabinet vibrating on top of itself (meaning the cabinet is vibrating long after bass note is produced from signal hence when the next bass signal comes in the cabinet partial cancels each waveform but creates a new one eventually leading to a monotone rumbling bass. But the vibrapods seem to damp out these cabinet vibrations, at least the important ones linked to cabinet and floor interaction, almost as quick as the woofer produces them. At the Vibrapods and take a MAJOR leap forward in Bass Quality (the extra rumbling bass will go away so apparent bass loadness will not be there until real low bass signal comes along)he sound was INCREDIBlY improved. Now I always leave the sub on at its lowest hz setting with about half gain for music. It really helps in my major league size listening room (25 ft x 15 ft x 8 ft). I was about to give these things away. Now I am happy with my purchase. The vibrapods will cut out the sloppy bass but leave you with apparent faster and much-much-much more articulate bass for music. Hence if you want resonanting bass to linger long past the signal for those non-sense sound effects don't do anything. This sub will deliver that type of bass foundation that keeps on going and going and going and....(ala Energizer Bunny).
The rest of system includes, in part, B&W 801 series 3 powered by Threshold SA4E Pure Class A amp, KEF 200C powered by Classe CA-100, and Matrix 805s. Air Matrix interconnects, Rotel RHT-10 tuner, Audiolab 8000t tuner, Meridian 608 Digital Tuner, Analysis plus speaker cables, 2 Monster Power HTS-5000 power conditioners, Stealth Power Cords, Audio Research LS3B Pre, Audio Research SDP1 Surround Processor, APS-13 17 ft antenna.
In summary, the HPS-500 is pretty much a disaster for music in the context of a high end system without Vibrapods but with them they are certainly above average but don't think they will give the sub leaders at several thousand dollars sleepness nights. So every bit a high end value if placed in the room correctly and on Vibrapods. I am only give the sub all 5 stars to partially off-set others that must think hi-end audio is about one upping the next guy and need to put equipment down. In reality I would rate them a 4.5 for value and a 3.5-4.1 overall (but I am being very critical here but I think objective when it comes to the very best subs out there)