I've been looking threads about these amp heads , But I couldn't find any thread comparing them. There's a lot reviews about them alone, but It will help me a lot comparing the 2 heads. Please let's us know if you already play with any of this heads and tell us the pros and cons. It will be helpful to me and probably to a lot of people, like always the talkbass has been helpful for a lot of bass players. Carvin B2000 - Power Output: 700w @ 8 ohms, 1300w @ 4ohms, 2050w @ 2 ohms , 14lbs $699.00 Markbass SD 1200 - Power Output: 750W @ 8 ohm, 1200W @ 4 ohm, 9lbs $1,099.99 at musiciansfriend Thank's a Lot.