I drove through the fog and rain to GC and Sam Ash tonight. First I plugged in the MB500 Fusion that I returned to them last week. It sounded fine, so I'm guessing it's COLD state is why it sounded FUBAR in my house last week. I took it straight from the UPS depot to my Markbass 2x10, and it was distorted all to hell, even with the gain low. Anyway, I couldn't get it to go gritty hardly at all on the Markbass 104HF (4x10). I realized that when I thought the MarkBass head there didn't have grit, it wasn't the head, but the cabinet. If you want a cabinet that will not break up easily, that's your huckleberry! Took the GK over to some Acoustic Neo cabinets, and plugged it into a 2x10, turned off the tweeter and started mucking around with the settings on the amp. It was ok, definitely broke up better on the Acoustic, but still sounded kind of farty like SS does. Then I went over to Sam Ash and their Tone Hammer 500 was plugged into an Aguilar cabinet. I turned the tweeter off, and started fooling with it. It sounded GREAT! I was about to record a clip of it, when some dude started wailing on a guitar near me, so that didn't happen. I wish I could have taken the Aguilar cab to GC and see if it makes the GK sound any better.