[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 been optimized for low-frequency amplification. JL Audio » Info » Wiring Diagrams for Subwoofers Info » Subwoofer Wiring DiagramsSimple, easy-to-follow diagrams show how both single voice coil (SVC) and dual voice coil (DVC) subwoofers can be wired to achieve the desired impedance and maximize amplifier power.