I see there's a bit of a buzz starting about the Auralex bass traps. I've looked at their site and the products seem interesting though I haven't investigated the UK pricing yet. What concerns me a bit looking at the specs is they only give results down to about 100-125hz. At which point the absorbtion is begining to tail off. RPG OTOH do tuned 40hz,50hz,63hz or 80hz membrane frequency traps, are these a better idea? I understand that RPG are more expensive though. Has anyone out there got any bass traps and measured good results at around the 70hz-40hz level that is messing up my system?