Hi Scott,
I would agree with everything that ST's said/suggested.
As you're using a third party mixer "a Mackie DL1608", and only having to pan your signals to one side or the other (without having to plug into different mixers as you would if using T1's), you can very quickly change the positioning of your vocals/instruments from one L1 to the other should it fit your requirements/preferences better.
I would, however keep to the idea that each vocal/instrument should only come from one L1. They should be heard equally well everywhere.
"should I use a second B2 and pan the bass up the middle"
I would think that with the punch that a B2 is capable of (in the setting) you should have enough to keep your bass player and the audience happy. You'd also have less expense (A1 B2) and less to transport, carry and set up. Outdoors I may well be thinking differently regarding the bass guitar and Sub(s).
You don't mention whether or not you'll be miking the Kick. If you do, I'd probably pan that to the L1 with the B2.
I very regularly suggest using an audio recorder when doing a sound check. If you have one, use it. That way you can hear whether or not the levels are OK in the mix (important for me as I always mix myself), and you hear the complete mix without your own voice in your head. You can even play it back through the system and walk around to see how it sounds. If you're playing with an acoustic drum kit but miking the Kick, you could even record straight out of the mixer (maybe muting the Kick for some of the recording so that drummer can play along to the recording whilst you walk around the location listening. If you sound check at gig volume you can then set the kick to fit in with everything else.). That way you would even be able to send the instruments/vocals to the L1's you'll be using. These are just thoughts and suggestions that may or may not be of help to you.
Scott, you started out here with: "Have a gig coming up in a place I haven't been before, but a bandmate gave me an idea of the size of space we have and it's not huge."
It'a always good (if possible) to get as much information about a location as you can before the day of the gig. Nothing can replace the experience of actually standing in the room and looking around. Sometimes it's not possible, but every small scrap of information can eventually help.
ST published an excerpt from an article in the Wiki which you might find interesting and helpful. It's called "Scouting the Venue" by Ken-at-Bose.
https://www.bosepro.community/...c/scouting-the-venue
I hope that this has been of some help and that the gig goes well for you, and please don't forget, we love to read gig reports here. Tell us about what went well, about what you had to do to overcome any problems which may have occurred etc. The main thing is to enjoy playing your music with a sound that's pleasing to your ears. I find that a good PA sound always inspires me to play better.
Tony
