Loyd,
I could find their price in Denmark at this site (remember the price is given in danish crowns)
http://high-performance.dk/product/268/48/Tilbehor/Akustikmoduler/smt-varitune-v6.html :
When dealing with such low frequencies you have typically to cover a significant area - I would consider that a minimum of 4 units will be needed to have a noticeable effect at 30 Hz. But it is only a guess. My tuned limp membrane bass traps tuned at 35 Hz cover an area of 2.2 square meters.
Thanks! About USD$780. fortunately its only in one spot in the room, and it only rears its ugly head on about 3 songs out of 1800 albums. You can hear it at 30hz when it strikes, but usually the strike is fast enough it does not linger around for long. Only in those 3 songs is their constant drone at 30hz. Not sure 2.2m2 is going to work in the living room.
Nevertheless, I will investigate a bit to learn. thanks again for taking the time to post it