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I believe Adire is the build house for some RE sub products. XBL2 is being patented by Dan. Adire products do rule. The Extremis drivers are the most impressive 6.5in drivers i've ever seen.
I wouldnt recommend buying an amp on ebay, only cuz I did and after a few months it blew, It was a pain and shipping alone was like 60 bucks+ to ship it both ways and since I didnt buy it from an authorized dealer the warranty was voided... so I was basically screwed and yeah I got a good deal but I got screwed in the end because the amp was more trouble than anything. I just went out and paid full price on a new MTX amp, the amp already comes with 3 year warranty and I got the extended service plan too!!!
I have seen a whole lot of drivers and non compare to the bass preformance of the Extremis. I'm sure some of the other high end speaker builders have amazing drivers but for 100$ the Extremis is one hell of a driver.