Alpine S-A60M Mono Digital Subwoofer Amplifier - 600 Watts x 1 @ 2-Ohms & 330 Watts x 1 @ 4-Ohms - Used Very Good - Creative Audio
Amazon.com: Universal Car Stereo Single 12" Alpine Type S S-W12D4 Bundle with Rearfire Sealed Sub Box Enclosure with S-A60M Amplifier & 4GA Amp Kit : Electronics
Alpine KTA-30MW Tough Power Pack Compact all-weather mono subwoofer amplifier * 300 watts RMS x 1 at 2 ohms - Breakers Stereo and Performance