Avionixx was the house brand for an electronics buildhouse called Value Electronics. Elemental Designs distributed/sold the Avionixx amplifiers back in the '04 - '05 range, until eD began offering their own line of amplifiers. Value Electronics was also the buildhouse for those early Elemental Designs amplifiers. Avionixx was a hot name on the internet until eD stopped carrying them in favor of their own branded amplifiers....Avionixx switched to a couple different resellers but I don't think it every really had the momentum it did when they are being pushed by eD. They weren't bad amplifiers. They're no Sinfoni, but no Pyramid either. Pretty middle of the road. I hadn't even realized they were still around until this thread, searching google I see they still have an active website. Interesting. Concept has been around for a while as well. They used to have some higher powered cheaper amplifiers that were all the rage back in the '03 - '05 time frame. The subwoofers weren't overly popular, however they did offer one interesting line. I believe the CSP line was design/built by RE (which means it was probably designed by Scott, the same Scott who now owns Fi ). I believe it used an XBL^2 motor. The RE Destroyers that were popular a couple years ago used the CSP motor. If your subwoofer is a CSP, it might be a pretty decent subwoofer.