PSB SubSeries 450 12" DSP-Controlled Powered Subwoofer at Vinyl Sound Toronto Canada

The SubSeries 450 is a DSP-controlled 12" powered subwoofer from PSB Speakers (Lenbrook Industries, Ontario, Canada), available at Vinyl Sound in Toronto, Canada. Designed by PSB founder and chief acoustic engineer Paul Barton, the SubSeries 450 represents PSB's most advanced subwoofer engineering in a compact near-cubic cabinet with a high-gloss black lacquer finish. It pairs a front-firing 12" polypropylene cone active woofer with two side-firing 10" passive radiators and a custom 400W RMS Class D amplifier with Hypex nCore technology, designed by NAD Electronics, delivering a flat frequency response dead flat to 20Hz (±3dB) with maximum output in excess of 100dB SPL. A SoundStage! Hi-Fi Recommended Reference Component, the SubSeries 450 is engineered for both home theatre and two-channel audiophile applications throughout the Greater Toronto Area and across Canada.

DSP-Controlled Bass Architecture: Flat to 20Hz

The foundation of the SubSeries 450's performance is its application of digital signal processing to the challenge of accurate, low-distortion bass extension. Analog filter-based subwoofer designs must compromise between low-frequency extension, maximum output, and distortion control, because a passive filter cannot optimize all three simultaneously. PSB's DSP engine, developed with NAD Electronics, addresses all three parameters in a single integrated solution: it maximizes bass extension to 20Hz, linearizes the frequency response across the full operating bandwidth, protects the driver and amplifier from overload at high output levels, and sets ideal crossover characteristics for the active driver and twin passive radiators. The result is a verified flat response from 20Hz to 150Hz (±3dB) that is rare even among subwoofers at significantly higher price points. The 12" (300mm) active driver uses a treated felt polypropylene cone, a 2.75" voice coil, a 6" spider for precise cone alignment at high excursion levels, a 75 oz magnet assembly, and a 1" rubber surround. Two 10" (250mm) passive radiators are mounted on opposite sides of the cabinet, providing 39 percent more total radiating area than the active driver alone and summing the woofer's back-wave output to reinforce deep bass below the driver's natural resonant frequency — without the port chuffing noise that vented designs can produce at very low frequencies and high output levels. A DSP subsonic filter prevents signal below 20Hz from reaching the passive radiators, where the opposing phase would cancel rather than reinforce the output.

NAD-Designed Class D Amplifier with Hypex nCore Technology

The SubSeries 450's amplifier was designed by NAD Electronics, PSB's sister company within the Lenbrook family, specifically for this application. It employs an advanced Class D output stage based on a licensed Hypex nCore architecture, one of the most respected and lowest-distortion Class D amplifier designs available. The amplifier delivers 400W RMS continuous power with 1000W dynamic peak power, supported by a tightly regulated switch-mode power supply capable of the instantaneous high-current delivery that accurate, powerful bass reproduction demands. The amplifier's extremely high damping factor gives the 12" woofer precise excursion control at all output levels, contributing directly to the SubSeries 450's tight, articulate bass character. Standby power consumption is under 0.5W, and the auto on/standby circuit activates the amplifier automatically when an input signal is detected. A 12V trigger input allows the SubSeries 450 to be powered on and off in sync with the rest of the system from any AV receiver or preamplifier with a 12V trigger output.

Flexible Integration with Any Music or Home Theatre System

The SubSeries 450 is designed to integrate seamlessly with any stereo or home theatre system configuration. The LFE input connects directly to an AV receiver's subwoofer output; when using the LFE input, the subwoofer's internal crossover is automatically bypassed, and bass management is handled by the receiver or processor. For two-channel integration without a dedicated subwoofer output, the stereo RCA line-level inputs accept an unfiltered preamp output, and the internal variable crossover (continuously adjustable from 50Hz to 150Hz) can be engaged to blend the SubSeries 450 with the main speakers. Speaker-level inputs via five-way gold-plated binding posts accommodate amplifiers without any low-level preamp outputs. The variable phase/delay control (0 to 180 degrees) allows precise acoustic alignment of the subwoofer with the main speakers in the listening room. LFE, line-level, and high-level outputs are also provided for connecting additional subwoofers or passing the signal through to a second zone amplifier.

Key Features

• 12" DSP-Controlled Active Driver: Polypropylene treated felt cone with 2.75" voice coil, 6" spider, 75 oz magnet, and 1" rubber surround, delivering flat frequency response to 20Hz (±3dB) with in excess of 100dB maximum SPL.
• Dual 10" Passive Radiators: Two side-firing passive radiators provide 39 percent more total radiating area than the active driver alone, extending deep bass into the infrasonic region without port chuffing or wind noise.
• 400W RMS / 1000W Peak NAD Class D Amplifier: Hypex nCore-licensed Class D amplifier designed by NAD Electronics, with an extremely high damping factor, high-current switch-mode power supply, and near-immeasurable distortion at rated power.
• DSP Engine: Maximizes bass extension, linearizes frequency response, prevents driver and amplifier overload, and sets optimal crossover characteristics for the active and passive radiator system.
• Variable Crossover (50Hz to 150Hz): Continuously variable low-pass filter for precise blending with main speakers in two-channel configurations; automatically bypassed when using the LFE input.
• Variable Phase/Delay (0 to 180 Degrees): Enables accurate acoustic time-alignment of the subwoofer with the main speakers in any room and placement configuration.
• Multiple Input/Output Options: LFE RCA input/output, stereo RCA line-level input/output, and high-level speaker-level inputs via five-way gold-plated binding posts accommodate any system connection configuration.
• 12V Trigger, USB Power Output, Auto On/Standby: 12V trigger input synchronizes power with the system; 5V/500mA USB output powers accessories; auto on/standby activates from signal detection with under 0.5W standby consumption.
• High-Gloss Black Lacquer Cabinet: Soft-edged near-cubic enclosure with a premium high-gloss black lacquer finish and vibration-absorbing feet.
• Designed by Paul Barton: Final voicing by PSB's founder and chief designer, consistent with over 45 years of PSB acoustic engineering and the NRC research partnership that underpins all PSB speaker development.

Technical Specifications

Connections at a Glance

• LFE Input/Output: Gold-plated RCA for direct AV receiver subwoofer output connection; internal crossover bypasses automatically on LFE input
• Stereo Line-Level Input/Output: Gold-plated RCA for two-channel preamplifier connection; use with internal variable crossover (50Hz to 150Hz)
• High-Level Speaker Input/Output: 5-Way gold-plated binding posts for amplifiers without preamp or LFE outputs
• 12V Trigger Input: Synchronizes power on/off with AV receiver or preamplifier
• USB Power Output: 5V/500mA for charging accessories or powering small devices
• Auto On/Standby: Activates from input signal detection; under 0.5W in standby

Press Recognition

• SoundStage! Hi-Fi Recommended Reference Component (2016)
• SoundStage! Access — full review by Kevin East (2016), praising flat 20Hz response and value versus subwoofers costing twice as much
• HomeTheaterReview.com — full review by Brent Butterworth (2016)
• Sound and Vision — full review (2016)
• AVS Forum — full independent review (2017)

Frequently Asked Questions

What is the PSB SubSeries 450?

The PSB SubSeries 450 is a DSP-controlled 12" powered subwoofer featuring an active 12" polypropylene woofer, two side-firing 10" passive radiators, and a 400W RMS / 1000W peak NAD-designed Class D amplifier with Hypex nCore technology. It delivers a flat frequency response from 20Hz to 150Hz (±3dB) with in excess of 100dB maximum SPL, in a high-gloss black near-cubic cabinet measuring 16.25" x 15.75" x 16.5". It is a SoundStage! Hi-Fi Recommended Reference Component.

How does the PSB SubSeries 450 compare to the SVS SB-2000 Pro or REL T/9x?

The PSB SubSeries 450, SVS SB-2000 Pro, and REL T/9x are all premium 12" subwoofers targeting serious home theatre and two-channel stereo applications. The SVS SB-2000 Pro uses a sealed 12" driver with a 550W RMS amplifier and DSP-based app control, claiming a -3dB point around 19Hz. The REL T/9x uses a sealed 10" driver with a 300W Class AB amplifier and REL's High Level connection approach for two-channel integration. The SubSeries 450 differentiates through its NAD-designed Hypex nCore Class D amplifier, dual 10" passive radiator system with greater total radiating area than the active driver, and DSP tuning that was developed to maximize bass extension and minimize distortion simultaneously. SoundStage! Hi-Fi named it a Recommended Reference Component, noting its ability to deliver flat 20Hz response matched by subwoofers costing twice as much. For Toronto listeners seeking a DSP-controlled subwoofer with proven press credentials and audiophile-grade amplification, the SubSeries 450 is a compelling choice in its class.

What is the role of DSP in the SubSeries 450?

DSP in the SubSeries 450 performs four simultaneous functions that a passive analog filter cannot execute together without tradeoffs: it extends low-frequency response to 20Hz by compensating for the natural roll-off of the driver and passive radiator system; it linearizes the frequency response across the full 20Hz to 150Hz bandwidth; it prevents driver and amplifier overload at high output levels by applying adaptive limiting; and it sets optimal crossover characteristics for the interaction between the active woofer and the two passive radiators. The result is a subwoofer that sounds flat, controlled, and distortion-free at output levels that would cause a comparably sized passive-filter subwoofer to compress, clip, or distort.

How do the dual 10" passive radiators work?

Passive radiators are unpowered speaker cones mounted in the subwoofer cabinet that are driven acoustically by the air pressure of the active woofer's backwave rather than by an electrical signal. They behave similarly to a tuned port in extending bass response below the active driver's natural resonant frequency, but without the port noise or chuffing that vented enclosures can produce at very low frequencies and high output levels. The SubSeries 450's two 10" passive radiators together provide approximately 39 percent more total radiating area than the active 12" driver alone. A DSP subsonic filter prevents signal below 20Hz from reaching the radiators, where their phase relationship with the active driver would cause cancellation rather than reinforcement.

What is the difference between using the LFE input and the stereo line-level inputs?

When connected via the LFE input, the SubSeries 450's internal crossover is automatically bypassed, and bass management is handled entirely by the AV receiver or processor. This is the correct connection method for home theatre systems where the receiver is already performing bass management and sending only low-frequency content to the subwoofer output. When connected via the stereo RCA line-level inputs from a preamplifier without a dedicated subwoofer output, the SubSeries 450's own variable crossover (50Hz to 150Hz) is engaged, allowing precise blending with the main speakers in a two-channel system.

Where can I buy the PSB SubSeries 450 in Toronto or Canada?

The PSB SubSeries 450 is available at Vinyl Sound, an authorized PSB dealer in Toronto, Canada. Vinyl Sound carries the full PSB SubSeries subwoofer lineup and can advise on system integration, placement optimization, crossover and phase alignment with main speakers, and professional installation services for residential home theatre and two-channel audiophile systems throughout the Greater Toronto Area and across Canada.

Can the PSB SubSeries 450 be used in a stereo two-channel system?

Yes, the SubSeries 450 is designed for seamless integration in both home theatre and two-channel stereo systems. For two-channel use, connect the subwoofer via the stereo RCA line-level inputs from a preamplifier's preamp outputs, engage the internal variable crossover to set the blend point with the main speakers, and use the variable phase control to align the subwoofer acoustically with the main speakers from the listening position. The SubSeries 450 was reviewed in a two-channel configuration with PSB's flagship Synchrony T3 towers and received praise for its precise integration and ability to resolve low-level bass detail.