I've been looking for a different power amp for my new cab ( SWR TRIAD ) it's a 4 ohm cab and I need an amp that will bridge into 4 ohms. At first the Stewart 1.2 looked like the answer. It is rated at like 1200 watts into 4 ohms bridged. However, others have experienced problems with thermal shut down at 4 ohms. Some have suggested leaving the upper rack space open and adding a fan. So now you have a 2 rack space amp and not a 1. The Stewart still only weighs 11 lbs but it cost around $600 bucks. (Sorry BH I'm not convinced you can deliver) The QSC is 2 rack spaces, has a fan and is only around $300 ( QSC is only rated ate 830 watts at 4 ohms continous, but, I think that is just a more realistic rating. I don't see how the Stewart could be rated at 500 watts per channel into 2 ohms and 1200 into 4ohms bridged????.) The only downfall to the QSC is weight 35lbs!!!!!. Which one would you buy.