I have a school "Battle of the Bands" coming up soon and I'm worried that my Fender Bassman 150 isn't going to be heard in the mix. For practice, the guitarist has always used a 40 watter and it was hard enough to be heard over him. For the show, he said he's going to get a half stack. I called 2 music stores looking for a good deal on renting a bigger amp and cab setup, and both of the salespeople told me that 150 is enough to get over a 100 watt half-stack. One said he was in a metal band with 8x10s and his bassist only used a 50 watter. What should I do? I just can't believe these guys. I always thought you needed atleast 4x what the guitarist is using.