i do...just waiting on my new sub. I've got a D2 C2 Audio Threatcon 2 12" coming. I'll be pushing around 900-1000 watts now instead of the 500 i'm running now on my SA-10. So i'll have to retune and make sure it's clean. probably in the next month or so we'll meet up
If it works like it did in the booth then they may be on to something for sure.
According to them it was "inspired by" the DD-1 actually. They claimed to made some adjustments and such...but they wouldn't go into details about who designed it or what alterations were made...non the less it performed very well at the show.
SMD and D'Amore have the technology behind the DD1 with a US Patent. Rockford is most likely paying SMD and D'Amore for use of this technology in their amps. Steve is good at 2 things, promoting his "SMD" brand and making money. this is just another way he is making money.