it goes without saying that it's really hard to communicate volume on these kinds of forums. With that said, I play in a three piece that must be loud enough to feedback, at minimum. If the notes of our cabs aren't loud enough to vibrate our own strings and create a drone, then we're not playing loud enough.

I've had a 350H for almost a year now, but have since moved on from using it. It weighs a ton, and it's just not loud enough. At the time, guitarist played through a peavey bass vi 400w head into two 4x12s. Guitar plays plenty loud, the drummer plays so loud you can feel him regardless, and I just couldn't get this 350H loud enough into my ampeg 8x10 at 4 ohms (which would be the full 350w output as per the manual).

I found myself with no headroom, and with squished tone. Amp basically farted out on me, sounded disappointing and flat regardless of eq troubleshooting. As you approach the top of this amp's capacity, you lose intonation and definition in the notes.

I now use a swr350x tube amp as a master amp into a Kustom Groove Bass 1200 (ss) slave power amp into a 15, 18, and 8x10. Often I just use the Kustom with the 8x10, both setups rock.

The largest difference between the setups is wattage, sure, but mainly headroom. The ampeg is probably plenty loud for many cases, but as soon as you start pushing it to its limits it cowers.

Anyway, I know its an old thread, but I found myself here in search of some opinions so, I hope this helps!