JL Audio JL Audio RD500/1: Monoblock Class D Subwoofer Amplifier, 500 W RD500/1 Monoblock Class D Subwoofer Amplifier, 500 W x 1 @ 2 Ω / 250 W x 1 @ 4 Ω - 14.4V Born to produce a whopping 500 watts into 2 ohms (14.4V, 1% THD), the RD500/1 amplifier was engineered to generate tons of pure subwoofer bliss... MSRP: Was: Now: $399.99