Here's a photo of the 115 + 210 rig I used this past weekend.
Ampeg SVT3-Pro, with SVT-115 and a Traynor 210 (I forget the model offhand).
Used it dry off the floor - no PA support, which we almost never do. Small venue, but terrible layout and sound throughout the room. Really seemed to absorb all the bass frequency, so thinking about it now, I was compensating by turning up louder and louder. Not always the best move. There was probably no "sound" at the back of the room, but everyone's bottles were vibrating off their tables lol.
I didn't bi-amp at all - Just ran into my tuner, and SansAmp BDDI on the floor, pretty basic set up. And to be honest, I couldn't tell if the 15 (or 210) was struggling. Everything seemed fine, but I really wasn't listening for it.