The SubSeries 300 is the first in a new line of subwoofer designs to be powered by NAD’s sophisticated, high efficiency amplifier. The SubSeries 300 also features trickle-down technology from PSB’s award-winning SubSeries 500 flagship, including the company’s exclusive “smart bass” limiting circuitry. As a result, the SubSeries 300 offers a winning combination of power, high impact bass, and musicality.

The SubSeries 300 deftly handles demanding and explosive transients in music thanks to the ability of the NAD amplifier to produce 850W of peak dynamic power, 425W of dynamic power, and 300W of continuous power (at <0.08% THD). The high power Class D discrete MOSFET amplifier output stage is 90% efficient, requiring less energy to produce more power. PSB engineers also redesigned the power supply in order to reduce standby power consumption to a remarkably low <0.5 watts. The SubSeries 300's small cabinet houses a highly optimised 12-inch woofer with polypropylene cone, butyl rubber surround, high power 50mm voice coil, and enormous 50oz magnet. A large 75mm diameter internally and externally radiussed down-firing port makes port noise nearly non-existent. PSB engineers employed FEA (finite element analysis) software and Klippel's sophisticated Distortion Analyser System to minimise distortion when designing the SubSeries 300's woofer. The SubSeries 300 inherits technology from the SubSeries 500 (recipient of the EISA Award for best European HT Subwoofer 2010-2011) by incorporating the latest implementation of PSB's proprietary "smart bass" limiting circuitry. "Smart bass" prevents audible overload even playing the most demanding music and film soundtracks, allowing the SubSeries 300 to deliver consistently clean and accurate musicality even when overdriven.