KEY 180.4 SMART AMPLIFIER The Key 180.4 Smart Amplifier 180 Watts, 45W/4-Channel, 4 Ohm The biggest advance – in the smallest package. Introducing the KEY smart amplifier and audio processor in one. Kicker CS Series 6-1/2″ component speaker system Kicker consistently prioritizes vehicle fit along with quality in their CS Series car speakers, making them among the most popular we sell. And better fit doesn’t come at the cost of better sound — you’ll find several cool innovations at work here. Kicker’s separate titanium tweeter, driven by a neodymium magnet, delivers your music’s highs with control and clarity. The woofer’s phase plug helps eliminate distortion, and its UV-treated poly-foam surround equips this Kicker speaker for enduring performance no matter what extremes life in your car door brings. Kicker CS Series 6-1/2″ 2-way car speakers Kicker’s 6-1/2″ 2-way speaker serves up stellar sound using a polypropylene woofer for the lower frequencies and a PEI balanced dome tweeter for the highs. You’ll get good results powering these speakers with a factory radio, but use an aftermarket car stereo or an outboard amp to enjoy classic Kicker quality with more detail and punch.