I owned and gigged an Eden WT300 head (with Carvin 2x10, later Eden 212xlt); that was followed by an Eden WP100 (Navigator) preamp driving a Crown amp. Both were purchased and used primarily for bass guitar gigs, as I used a Contra for URB 95% of the time. I obviously did use both in cases where I needed higher volumes, and also spent a good deal of time experimenting with settings at home to find a reference setting to use on URB gigs as needed.
I never did like the WT300 for URB, it just didn't produce a natural, acoustic sound for me. and while I think the WP100 preamp had the capability to be a little less "Edenish" than the WT300, I wouldn't recommend it for URB. I don't use Edenish as a pejorative-- it's simply their signature sound. Even without the Enhance knob to invoke their "smiley curve", it sounds Electric to my ears, YMMV -- we are all looking for the URB sound we expect -- and you should probably expect that to evolve over time as you continue to experience playing string bass.
I wouldn't suggest committing to one (for URB use) without being able to audition it first, though it can be a cool slab rig!
The only other preamp I have extensive experience with was the Kern IP777, a great preamp with lots of tube warmth, though it can be a bit dark-sounding if you're not careful. I used that (with QSC2402 and EA VL208 cabs) primarily for bass guitar, too, but was happy with its character for URB-- but still primarily used a Contra.
Good luck in your quest!