The JBL Concert A704 is a 4-channel Class AB car amplifier that delivers 70 watts RMS to each front and rear channel and can be bridged to supply up to 180 watts RMS to paired subwoofers. It is designed for aftermarket car audio systems that require precise musical detail and reliable power.

The unit includes adjustable high-pass and low-pass crossovers from 40 Hz to 400 Hz, an auto turn-on that detects high-level DC offset greater than 2.5 volts or a +12V remote signal when using line-level inputs, and an efficient cooling design. High quality audio capacitors and power MOSFETs are used for stable performance and durability.