Kappa mono and full-range, multi-channel amplifiers deliver the efficiency and power you expect from Class D amps-and the performance you expect from Infinity.. Each model in the lineup will accept both high-level or low-level inputs, allowing the JBL Stadium amplifiers to be added to virtually any car audio system, including factory installed systems. The 2-, 4- and 5-channel amplifiers offer Bluetooth audio streaming, exclusive Clari-Fi music restoration technology that analyzes and improves the audio quality of compressed files in real time, a multi-pairing Party Mode that lets anyone in the car stream music, and a cabin-mounted control panel. Kappa amplifiers give you the power to shape your car audio experience in new ways.