Original series, 550 watts into 4 or 2 ohm (only the 4-ohm spec is listed on the literature, but John from EA confirmed for me that the Doubler is 2-ohm stable, and I've used it at two ohms with no issues). At under 3 lbs it is light as a feather and super compact. You won't even notice it in a gig bag pocket. This has been a great head for me, but after the purchase of my Handbox hybrid head this one has divided time between in the pocket of my gig bag as a backup and the top of my practice rig. I've just made a hefty bass purchase, and as per house rules must reimburse the family checking account a.s.a.p., so I'm listing several pieces of gear, and as soon as I've reached my target amount, will take any remaining pieces back off the market. Very clean, with no scratches that I can see. You'll see in one picture that one corner has a very slightly flattened point, but this doesn't affect anything and is not noticeable at any distance. $485 shipped to CONUS. PM me with questions or offers. No trades, please, as I'm solely interested in raising funds at the moment. Thanks for looking!