[PDF] monoblock subwoofer amplifier - JL Audio The JL Audio 500/1v2 is a monoblock . subwoofer amplifier utilizing proprietary and patented Class D technology. Its frequency response is limited to the range below 250 Hz. It is not designed for driving midrange speakers or tweeters. Every aspect of its operation has 500/1v2 - Car Audio - Amplifiers - Slash v2 - JL Audio The 500/1v2 deploys efficient Class D technology with a patented control circuit and JL Audio's signature R.I.P.S. power supply design to ensure full power delivery (500 W) over a wide range of load impedances and vehicle voltages.