The amp was introduced in Jan 12th 2004 its 49.5" long 10" wide 5" thick, rated at 4000wrms@4ohms, and 8000wrms@2ohms, and it does 9600wrms @ 2ohms at 14.5volts, this amp is a beast, i just bought a D400x and would love to have the D400x Stage 2 Long Board!! If anybody knows where one of these are or has one of these amps i want it!!!!//content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif I will have to mount it on top of the tahoe since its 49.5" long...lol i monster!!