New Monolith THX Ultra subs offer reference level bass

Just when you thought subwoofers had become too polite for their own good, US-based audio brand Monolith takes the wraps off two new THX Ultra-certified subwoofers. The 13- and 16-inch powered subs are designed for larger rooms, up to 3,000 cubic feet, certified to reach THX Reference Levels at a 3m viewing distance from the screen.

The 13-inch model is available now, while its 16-inch stablemate will follow in October.

The sub features a new high-excursion woofer, its hybrid cone combing long fiber pulp and fiberglass, the former bringing stiffness, the latter adding additional rigidity without onerous weight.

Providing muscle is a 2,000-watt (RMS)/3,800-watt (peak) Class-D amplifier, featuring a 48-bit Texas Instruments digital signal processor. This DSP allows Monolith to deliver a flat response from 16Hz to 250Hz, and maintain that accuracy at peak volume with minimal added distortion and artifacts, says the manufacturer.


The cabinet is high-density fiberboard (rather than MDF), internally braced, creating a sonically inert enclosure that won’t vibrate or add unwanted resonance. A trio of 100mm double-flared ports are used to minimise internal turbulence and maximise sound pressure levels at low frequencies. These ports allow the sub to operate in sealed, semi-sealed and ported configurations. Finishing touches include a non-resonant MDF floating grille, designed to maximize air flow of the woofer and ports.

The 13-inch model measures 605 x 515 x 740mm and weighs a reassuring 69.5kg.

Hobie Sechrest, Monolith Business Unit Manager, said: “With our new 13- and 16-inch subwoofers, we set out to reach an unprecedented new level of performance, while still offering the best value in the industry. With newly designed high-excursion drivers, 2,000-watt DSP amplifiers, and THX Ultra certification, these new subwoofers have well exceeded that goal.”

The 13-incher sells for a competitive $1,599.99 and is available online here. Details about the Monolith 16-inch THX Ultra-certified subwoofer are promised closer to availability.