JL Audio HX280/4 Motorcycle Bike ATV UTV Audio Waterproof 4 ch. Amplifier 4-Channel Class D Full Range Amplifier RMS Power Rating @ 14.4 V: 4 ohms: 50 watts x 4 chan. 2 ohms: 70 watts x 4 chan. Bridged 4 ohms: 140 watts x 2 chan. RMS Power Rating @ 12.5 V: 4 ohms: 36 watts x 4 chan. 2 ohms: 52 watts x 4 chan. Bridged 4 ohms: 100 watts x 2 chan. NexD ultra-high-speed switching design Black powder-coated finish