I need sound

Recently, I was asked to do a Zumba fundraiser for a local company. Not a problem. I would like to upgrade my sound system a bit though. As I was browsing around the internet for opinions and prices, I came upon a very nice Epiphone Bass. My husband plays the guitar a bit and I seem to recall him talking about wanting to learn how to play the bass. He already got his birthday present but maybe I'll file this away in my brain for Christmastime. By the way, does anyone have any opinions on speakers? I need something I can plug my Zune into that will be loud enough to use in an indoor basketball court/gym. Thank you!