JL Audio XD500/3 500W 3-Channel XD-Series Car Amplifer XD Series 3-Channel Class D Car Amplifier Channels 1 & 2 RMS Power Rating (14.4V): 4 ohms: 75 watts x 2 chan. 2 ohms: 100 watts x 2 chan. Bridged 8 ohms: 150 watts x 1 chan. Bridged 4 ohms: 200 watts x 1 chan. Subwoofer Channel RMS Power Rating (14.4V): 4 ohms: 180 watts x 1 chan. 3 ohms: 240 watts x 1 chan. 2 ohms: 300 watts x 1 chan. Channels 1 & 2 RMS Power Rating (12.5V): 4 ohms: 60 watts x 2 chan. 2 ohms: 90 watts x 2 chan. Bridged 8 ohms: 120 watts x 1 chan. Bridged 4 ohms: 180 watts x 1 chan. Subwoofer Channel RMS Power Rating (12.5V): 4 ohms: 180 watts x 1 chan. 3 ohms: 240 watts x 1 chan. 2 ohms: 300 watts x 1 chan. Unregulated MOSFET switching type power supply NexD Ultra-High Speed Class D topology