JL Audio XD500/3 500W 3-Channel XD-Series Car Amplifer
XD Series 3-Channel Class D Car AmplifierChannels 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 supplyNexD Ultra-High Speed Class D topology