Getting more sound out of mini?

One of my minis doesn't put out much sound. I'm connected via hdmi to the TV and the TV's sound is at max, but the sound is barely adequate. I'm wondering if there's a way to increase the sound, like maybe going to external speakers. I see there's an av and component out on the back but not sure if that's for this application.

Anyone else have this problem or possible solutions? Thanks.