The BB800 was praised for the compression characteristics which I think would explain my experience. The BB800 was “toothless” with the SC, lacking top end bite, and sounding rounded off. A tweeter or compression driver might’ve helped the pairing but I didn’t have that (like the SM or BB cabs). The pairing didn’t sound dark, just excessively smooth. The BB800 EQ didn’t allow for more edge to be dialed in, so I looked to outside pedals for help. At the time I had a Darkglass box (can’t recall but I think it was an AO) and a Dunwich Volt Thrower which could be excessively smooth. Running either through that head couldn’t generate any zing or edge. It was just felt polite and restrained. I wasn’t trying to get it to overdrive or distort, I just wanted a clean tone with some top end definition.
Cut to me acquiring a Mesa Buster which can dial in an aggressive, edgy voice and the SC paired very nicely, capable of a range of tones from bright and zingy to round and warm. The cab delivered with that head and a few others that rotated through my collection, which left me to assume Quilter was the thing I didn’t like.
I’ve said it before but other amp I didn’t enjoy with the SC was the Jule Monique pre + a power amp. I felt like the Monique’s midrange was congested and odd with that cab and the EQ wasn’t flexible enough to remedy that. I switched to from Monique to a Genz Shuttle head and got much closer to what I was after, much more easily.
I know Quilter is a TB darling and enjoyed by many, but to me it sounded/felt restrained and throttled, like it was overly compressed.