Stealth Bomber B2 Car Amplifier - 500 W - 2 Channel - Class D Bomber Series 2-Channel Class D Digital Amplifier | Dimensions: 4.02"W x 6.99"L x 1.4"H RMS Power Rating: 4 ohms: 150 watts x 2 chan. / 2 ohms: 250 watts x 2 chan. / Bridged, 4 ohms: 500 watts x 1 chan. Ultra compact high density aluminium alloy chassis | Direct FET Power Mosfet Output Stage IC audio driver provides superior overload protection |  Auxiliary for use when RCA connections are not available Frequency Response: 10 - 35,000 Hz | Total Harmonic Distortion: 0.5% | Signal to Noise Ration: 85 dBA @1w | Damping Factor: &gt;250 (50Hz @ 4