Check the listing for details. PreSonus AIR XD Sub 18 Powered Subwoofer. Condition: New. Listed at 1099.99 USD. Massive Bass from a Compact Sub Delivering massive bass from an astonishingly small footprint, the PreSonus AIR XD Sub 18 houses a burly 18-inch low-frequency driver for deep, defined lows. This muscular powered PA subwoofer is driven by a 2,000-watt Class D power amplifier, yielding 130dB of clean, high-headroom output. Its dual combo inputs include direct outputs for flexible routing. Meanwhile, a full-color LCD screen gives you easy access to system settings and vivid metering. Matching the AIR XD Sub 18 to your full-range speakers is incredibly straightforward using the optimized DSP presets, and you get a variable lowpass filter for fine-tuning your crossover point. Moreover, built-in Bluetooth with TWS Bridge Mode facilitates seamless wireless stereo pairing with a second unit.