I use an Alpine mp3/wma headunit, with Alpine Type S speakers and 2 component dome tweeters. Right now they are running off the factory amp in the car. The sound is great and im really happy with the results, Clear tight sound offsets my bass from 2 RF 12" P3 subs wih RF Punch Power P500 amp. I recommend Alpine products, this is my second setup using them and im very pleased.