The PA in Tunnel 2 is much smaller than that in Tunnel 1. Their are a pair of Nexo PS10's and one matching sub to go with it. A gig in this room can work as long as the band communicate with the engineer. Most of the sound should come off the stage, as generally, only the kick drum needs to be mic'ed up. When I do sound in there, I mic up the kick drum, DI the bass, mic up the guitars (but only for monitoring purposes) and then I obviously mic up the vocals. How many people are you expecting?