i have no idea how that is even possible. I can (and have) taken my original prototype, serial #0001 and put it next to serial #003000 and it would be exactly the same. I could put it next to an HV and have it be exactly the same. I even made a video showing they are all the same. I have no idea what you guys did, i wasn't there but something isn't right.
If you feel the product has a problem, send it in, i will take a look at it. Actually send them both in i would like to see for myself.
Ill send him a pm to see if he is willing to send it to you but I'll send mine in. Like I said I'm not bashing the dd1 what so ever its just his showed distortion before mine every way possible. My h/u, his h/u, my amp and his amp all showed distortion on his dd1 before it did on mine. If you want me to send it in pm me with the details on where to send it.