All the PA you need all the sound quality you want none of the hassle you worry about. Make your live sound reinforcement a breeze with the Roland BA-330 Portable Digital 4-Channel Stereo PA System. Youll get fantastic clarity and power across the whole stereo field and all from one compact portable unit. With an integrated four-channel mixer along with a variety of connectors advanced anti-feedback processing and on board effects youll have total control of your sound. If youre worried about feedback the anti-feedback system turns on with the flip of a switch.