There's been very little discussion about this amp head here, but I'm wondering if any of you have experience with it. I just picked one up. I've got a couple days to try it out, but I can return it if I want. I've been using it with a Bergantino HT112, with acoustic upright and electric bass guitar. I was drawn to the Ampeg because of its two separate channels, as I've been looking for a perfect doubling amp that doesn't require resetting the EQ every time you switch instruments. Well, I tested the amp with a jazz/funk group yesterday and got some mixed results. The Ampeg/Berg combination was terrific for EBG, and I could get a nice upright sound. The problem was that the upright sound wasn't quite cutting through the mix. It sounded fine playing by myself, but once the drummer kicked in, the sound wasn't quite projecting. At higher volumes, the sound seemed a little compressed on upright. I'm wondering if it was the amp, the cabinet, or some other mystical mojo. I'm using a classis Underwood pickup with the older version Fishman Model B preamp. Essentailly my questions are these: Does anyone have experience with the portabass 800 and upright? If so, what cabinet are you pairing it with and how do you achieve optimal sound (EQ settings, preamp use)? Thanks in advance.