Pioneer GMA3702 500W 2 Channel Bridgeable Power Amplifier. 500W 2 Channel Bridgeable Amplifier - Pioneer GM-A3702. Maximum power input - 500W (Bridged) or 2 x 170W (4 Ω) or 2 x 250 W (2 Ω). Designed to enhance your in-car audio experience, the powerful GM-A3702 gives you total installation freedom and very low distortion.
eBay