Club Amplifiers Authentic JBL Power and Performance. New high-performance JBL Club amplifiers deliver world-class JBL power from a compact chassis built to fit in more vehicles, even when space is tight. Available in 4-channel, 5-channel, and mono models, Club amps feature variable crossovers and bass boost for precise control and tuning, plus high- and low-level inputs that let them integrate with most car stereos.