i have had an 800rb for a year and half, but i always just use it for rehearsal plugged into a single neo 2x12 or small ampeg cab. It sounds good, but nothing special and i really can't crank because rehearsal is in a residential area. i love this head because it makes me sort of nostalgic for seeing all those band's with one in the 80s and 90s. i had used house or rented 800rb heads in a backline once or twice (but never with time to really mess with it) and with crappy cabs. Getting to use one is rare because nowadays backlines seem to be ampeg 810s or 410s and ampeg solid state heads, a CL if you get real lucky. well, i decided for fun to not use my old reliable (GK 1001rbII) road head and use my 800rb for a gig last night. so i took the GK 1001rbII head out of the rack case, and put the rack ears on the 800 and put it in my rack case. (oddly the 800 didn't rack well, and the holes didn't exactely line up correctly, so i am only using 2 of the 4 rack screws to hold it in, but it seems to be enough). i brought both my neo 2x12 cabs to the show since it was an outdoor music fest. i have used both cabs before, but ususally stack them on top of each other to make them tall vertically. this time, i turned them on their side and stacked one on top of the other, and used the 800 head (in full range/ not biamp) to power them and sent my bass signal to house using the GK 800rb's DI. my tone on stage and in the house mix was about the best it's ever been, and it slayed the other bass player's tones who played that night (if i can be so bold to say so). I don't know if it was because it was using both cabs instead of one, or because i had the cabs on their side coupling with the stage, or my EBMM stingray was having a good day, but the tone was in the zone on stage, and the house (from the 800s DI). it was the perfect punch. i was like that 800rb came to life once it was able to have a little juice and room to breathe. awesome! on stage it sounded great, and i was listening to the tone right out my cabs before they turned me on in the monitors. it was dead on, and usually outdoor sound really sucks. I think the house sound was possibly better than when i use my 100rbII (which is pretty damn good). it didn't have those super sub lows and glassy top like the 1001rb, but way more cut through guitar mids, and i could hear articulation much easier. i think I may be using the 800rb from now on.