JL Audio XD700/5 5-Channel 700W Class D Amplifier Frequency Response (Front and Rear Channels): 12 Hz - 22 kHz (+0, -1dB) Frequency Response (Subwoofer Channel): 10 Hz - 1 kHz (+0, -1dB) Damping Factor (Subwoofer Channel): &gt;150 @ 4 ohms per ch./ 50 Hz Dimensions (L x W x H): 10.23 x 7.09 x 2.05 in.