JL Audio JX400/4D 4-channel car amplifier &mdash; 70 watts RMS x 4 RMS Power Rating (14.4V): 4 ohms: 70 watts x 4 chan. | 2 ohms: 100 watts x 4 chan. | Bridged, 4 ohms: 200 watts x 2 chan. RMS Power Rating (12.5V): 4 ohms: 50 watts x 4 chan. | 2 ohms: 80 watts x 4 chan. | Bridged, 4 ohms: 160 watts x 2 chan. Input sensitivity: Low level input: 200mV - 4V | High level input: 2.0mV - 10.0V 3-way protection circuitry (thermal, overload, and speaker short protection) Fuse Rating: 40A x 1 inline (not supplied) | Dimensions: 7.68"W x 9.05"L x 2.09"H