Air XD Sub 18 1 x 18" Active Extended Definition Subwoofer Region:EU the Quantum HD 8 features

the Quantum HD 8 features eight newly redesigned high-definition MAX-HD mic preamps with +75 dB of gain – making it ideally suited for today’s most popular microphones

or recording stand out

Use onboard Bluetooth 4

When flown or combined for ground-stacked applications

Controls include

Air XD Sub 18 1 x 18" Active Extended Definition Subwoofer Region:EU the Quantum HD 8 featuresThe PreSonus Air XD Sub 18 is a high performance active subwoofer designed for professional use, delivering massive low end extension and high SPL for large scale events and installations. Its custom 18 inch low frequency driver with enlarged voice coil provides efficient power handling and deep, punchy bass with minimal distortion, while advanced tuning optionsincluding variable lowpass filtering, alignment delay, and cardioid end fire array