My main rig is an Epifani UL 502 stacked with 2 UL112 cabs, or just one if the venue is small. It's big and clear and loud and quick and generally sounds fantastic in every setting, but... I have been curious about using a single 15" for jazz gigs. I'd like something a little slower, with a more "traditional" electric bass jazz tone. An Ampeg B15 would be awesome, but I'm thinking maybe a good 15" cab with the UL502 would be all I need. Like a bigger, more powerful Polytone. My main jazz-gigging bass is a Rick Turner Electroline fretless 5. Huge, smooth, deep tone that can emulate an upright pretty well with good technique and a little EQ. It sounds incredible through the UL112, but I'm really curious how it would work with a 15. I once had a BagEnd S15D that I miss. Also been curious about an Avatar 15. Or building my own single 15" cab. Nothing fancy, probably no tweeter/horn, though possibly a 6" midrange driver (pointed up). I'm open to suggestions, but also wondering what would sound great with jazz (more traditional, jazz-guitar trio, vocal, etc.)?