Thanks for the very helpful post! Can you elaborate on why it’s better to add another 10-2 rather than adding a 12-3 or other larger cab?
Also — good to hear that you’re not hearing the fan. That was one of my concerns, and one reason why I’ve been considering the Mesa D-350 + a 12” cab as an alternative. As you know, in some pit situations in smaller spaces any noise coming from the players’ equipment can become an audible issue.
You could, of course, pair the combo with any of the other Genzler cabinets, or for that matter, with most any cabinet on the market. My thoughts on it are that the 10-2 is a fine cabinet, and a second one is simply more of the same. The 10-2 is a tiny cabinet, so carrying the combo and the extension is easy. The 10-2 stack is also visually consistent for those who care about such things. Plus, it maintains the small footprint of the combo. There's nothing to stop one from putting the combo atop the 15-3. But, the combo output would be far surpassed by the 15-3, and the 15-3 is probably inappropriate for a setting such as music theatre. Plys it's a lot bigger!
I maintain my original response, which is the 10-2 combo puts out more than enough solid volume for any conceivable indoor theatre pit. I've done outdoor stages, and the combo could handle that as well. I got the extension mostly for non-theatre work, as well as the utility of having the second cab at home for practicing. I don't think you'll need a second cab for theatre.
I sure do know about audible non-playing sounds coming from the amp, all too well. It annoys the crap out of the other musicians. 60 cycle hum is common in older pits, possibly from non-standard or deteriorated building wiring and generally from dimmer packs. This week, I'm experiencing that and having to turn down the bass' volume knob between songs. (The bass is an EMG-equipped Synapse, which normally has no pickup-related noise issues.) For the remaining perfs, I'm plugging the combo into the sound tech's rack power conditioners which are immediately to my left in the Bijou pit. I've been plugged into a rat's nest of power strips and extension cords that are shared by the two guitar players, one of whom has been having hum issues as well.
In years past, I had been using a Quilter BB-800, but the fan noise was always an issue. I briefly used my fanless Mesa D-350 and it is always silent. It's nice to have silence in the pit between songs!