If the upcoming audition goes OK I expect to be playing through a Selmer Treble'n'Bass 50 and a 15" bin, in small venues. I also have a passive DI box for between the bass & the amplifier in bigger venues. I hope I'm not being naive in thinking it'll be loud enough.
I've skimmed previous posts but not noticed anything on the subject of how the o/p stage drives the speaker (sorry if it was there and I missed it): at low frequencies are we not concerned with how much current the amplifier can shove through the speaker, and is it not true that solid state devices are current amplifiers whereas valves are voltage amplifiers requiring an o/p transformer to match the low impedance of a speaker to the high impedance requirement of the o/p stage? In other words one might expect solid state amplifiers to work better with bass. In the Hi Fi world the solid state amplifier is usually reckoned to have more "slam" in the bass dept. This isn't an attempt to put valves down, I love them - for Hi Fi, for guitars, and for bass, but I am suggesting that if it's "slam" you want, then you're more likely to get it from a solid state circuit unless you can afford the very best Ampegs.