Designed to fit beneath a QB1 or QB1XBD main monitoring system, the BST subwoofer can extend the deep bass capabilities of any PMC setup, whether two-channel or multichannel. Being passive, the subwoofer enables a variety of flexible and easy mounting options, including freestanding, in-wall and soffit-mounted.

An effective ATL (Advanced Transmission Line) length of 4.5m extends frequencies to below 17Hz, while a 15” drive unit handles peak excursions in excess of 40mm each way to a maximum continuous peak SPL of 120dB, far exceeding any previous PMC product.

The drive unit’s innovative motor structure features a large ferrite magnet inside a colossal 7.4” voice coil, facilitating extremely efficient magnetic flux deployment and extraordinary thermal power handling capabilities more than 2500W RMS continuous. This maintains extreme output levels for extended periods of time with negligible power compression or distortion.

As the ATL’s vent exit experiences high air velocities from the 15” drive unit’s extreme excursions and the sheer force of the motor driving air through the transmission line, PMC has provided its LaminairX aerodynamic control to negate turbulence and drag. This in turn reduces resistance, bringing down harmonic distortion by up to 3dB, eliminating air noise and providing bass with superlative timing and an unparalleled dynamic range.

To handle the extreme acoustic pressures created within the ATL by the 15” drive unit, the BST cabinet features 36mm-thick panels on the front, top, bottom, and back baffles. Thanks to the ATL structure, the side panels benefit from immense bracing. Combined with further reinforcement from the extra-long LaminairX fins before the vent exit, the BST cabinet remains inert, even at the highest output levels.