PSB SubSeries 350 12" Sealed Powered Subwoofer at Vinyl Sound Toronto Canada

The SubSeries 350 is a compact 12" sealed powered subwoofer from PSB Speakers (Lenbrook Industries, Ontario, Canada), available at Vinyl Sound in Toronto, Canada. Incorporating trickle-down engineering from PSB's flagship SubSeries 450, the SubSeries 350 delivers accurate, musical bass from a high-gloss black near-cubic sealed MDF enclosure suited to home theatre systems and stereo two-channel setups where floor space is limited. It pairs a front-firing 12" (300mm) polypropylene cone woofer with a 300W continuous / 900W peak NAD-designed Class D MOSFET amplifier featuring PSB's proprietary smart bass limiting circuitry, delivering a verified frequency response of 25Hz to 150Hz (±3dB). Voiced by PSB founder Paul Barton at Canada's National Research Council (NRC), the SubSeries 350 integrates seamlessly with any home theatre or two-channel system through its comprehensive rear-panel connection suite in Toronto, Canada and across North America.

12" Sealed MDF Enclosure: Tight, Accurate Bass in a Compact Cabinet

The SubSeries 350's acoustic suspension (sealed) MDF cabinet is engineered for rigidity and acoustic neutrality, chosen by PSB specifically for its ability to produce tight, accurate bass with a smooth low-frequency roll-off that is more musically coherent than ported designs at the lowest frequencies. The sealed enclosure allows the 12" (300mm) polypropylene woofer to transition gracefully below its resonant frequency rather than cutting off abruptly, a characteristic that makes sealed subwoofers the preferred choice for music reproduction alongside home theatre use. The front-firing woofer uses a polypropylene cone with a rubber surround, matched to the sealed enclosure volume and the NAD-designed amplifier for optimized bass performance across the 25Hz to 150Hz operating bandwidth. The cabinet is finished in high-gloss black with deeply rounded soft edges and includes an acoustically transparent detachable grille that covers only the driver, leaving the high-gloss finish visible around it. Four custom-designed rubber vibration-absorbing feet decouple the cabinet from the floor, preventing low-frequency vibrations from coupling to the room structure and introducing boom or resonance artifacts into the listening environment.

300-Watt NAD-Designed Class D MOSFET Amplifier with Smart Bass Limiting

The SubSeries 350's amplifier was designed in collaboration with NAD Electronics, PSB's sister company within the Lenbrook family, specifically for this subwoofer application. It employs an advanced Class D MOSFET architecture delivering 300 watts of continuous power and 900 watts of dynamic peak power, with a tightly regulated power supply capable of the instantaneous high-current output that accurate, impactful bass reproduction requires. Standby power consumption is under 0.5 watts, with automatic activation from audio signal detection. PSB's proprietary smart bass limiting circuitry monitors both the amplifier output and driver excursion in real time, protecting both the amplifier and the 12" woofer from being overdriven at high volume levels without audible compression artifacts under normal operating conditions. Rear-panel controls include a continuously variable crossover (50Hz to 150Hz), a continuously variable phase control (0 to 180 degrees), and a bass level volume control. The phase control is continuously variable rather than a conventional two-position 0/180-degree switch, enabling more precise acoustic time-alignment of the SubSeries 350 with the main speakers from any room placement position. The USB power output port on the rear panel can supply power to an optional Bluesound RT100 wireless transmitter, allowing the subwoofer to receive audio wirelessly from an AV receiver or preamplifier when cable routing is impractical.

Key Features

• 12" Front-Firing Polypropylene Woofer: NAD-matched driver with rubber surround in a sealed acoustic suspension MDF enclosure, delivering tight, accurate bass from 25Hz with a smooth low-frequency roll-off suited to both music and home theatre applications.
• 300W Continuous / 900W Peak NAD Class D MOSFET Amplifier: Custom-designed amplifier from NAD Electronics with under 0.5W standby power consumption and PSB's proprietary smart bass limiting circuitry for driver and amplifier protection under high-output conditions.
• Sealed Acoustic Suspension MDF Cabinet: Ultra-rigid, acoustically inert sealed enclosure for tight, controlled bass without port noise or passive radiator resonance artifacts; deeply rounded soft edges in high-gloss black.
• Continuously Variable Crossover (50Hz to 150Hz): Wide-range continuously variable low-pass filter for precise acoustic blending with any main speaker system, from small satellites to large floorstanders.
• Continuously Variable Phase Control (0 to 180 Degrees): More precise acoustic time-alignment than a standard two-position phase switch; enables optimal integration with main speakers from any subwoofer placement position in the room.
• NRC-Voiced by Paul Barton: Final voicing performed by PSB's founder and chief designer at Canada's National Research Council anechoic chamber, using PSB's established methodology of objective measurement combined with panel-based subjective listening evaluation.
• Comprehensive Connectivity: LFE RCA input/output; stereo RCA line-level input/output (with high-pass output at 80Hz/12dB octave); speaker-level input/output via 5-way gold-plated binding posts; USB power output for optional Bluesound RT100 wireless adapter.
• Detachable Acoustically Transparent Grille: Covers the driver while leaving the high-gloss cabinet visible; removes easily for a clean driver-exposed look.
• Vibration-Absorbing Rubber Feet: Custom-designed feet minimize vibration coupling between the subwoofer and the floor for cleaner bass without room-excited resonances.
• Optional Wireless Operation: USB power port supports the optional Bluesound RT100 wireless transmitter/receiver, enabling wireless subwoofer placement where cable routing is not practical.

Technical Specifications

Connections at a Glance

• LFE Input/Output (RCA): Direct AV receiver subwoofer output connection; internal crossover bypasses automatically on LFE input
• Stereo RCA Line-Level Input: For two-channel preamplifier or receiver preamp output; use with internal variable crossover (50Hz to 150Hz)
• Stereo RCA Line-Level Output: High-passed at 80Hz/12dB octave to pass midrange and high frequencies to main speakers when the SubSeries 350 handles bass management
• Speaker-Level Input/Output (5-Way Gold-Plated Binding Posts): Accepts bare wire up to 10AWG, spade lugs, pin connectors, and banana plugs (single or dual); for amplifiers without preamp or LFE outputs
• USB Power Output: Powers optional Bluesound RT100 wireless transmitter for wireless subwoofer placement
• Rear-Panel Controls: Bass Level (volume), Crossover (50Hz to 150Hz), Phase (0 to 180 degrees continuously variable)

Frequently Asked Questions

What is the PSB SubSeries 350?

The PSB SubSeries 350 is a 12" sealed powered subwoofer featuring a front-firing polypropylene cone woofer, a 300W continuous / 900W peak NAD-designed Class D MOSFET amplifier, and a high-gloss black sealed MDF acoustic suspension enclosure. It delivers a frequency response of 25Hz to 150Hz (±3dB) and includes LFE, stereo line-level, and speaker-level inputs and outputs, continuously variable crossover and phase controls, and a USB power port for optional wireless operation.

How does the PSB SubSeries 350 compare to the SVS SB-1000 Pro or REL T/5x?

The PSB SubSeries 350, SVS SB-1000 Pro, and REL T/5x are all compact sealed subwoofers targeting home theatre and two-channel audiophile buyers who prioritize accuracy and musical coherence over raw output. The SVS SB-1000 Pro uses a 12" driver with a 325W RMS amplifier, DSP-based app control, and claims a -3dB point around 20Hz in a slightly smaller cabinet. The REL T/5x uses a 10" driver with a 125W class AB amplifier and REL's High Level Neutrik Speakon input approach, optimized for two-channel integration. The SubSeries 350 differentiates through its NAD-designed Class D MOSFET amplifier with smart bass limiting circuitry, NRC-voiced tuning by Paul Barton, and a comprehensive connectivity suite including speaker-level outputs with high-pass filtering that allows bass management without a dedicated subwoofer output on the amplifier. For Toronto homeowners who want PSB-engineered, NRC-voiced bass performance in a compact 12" sealed format, the SubSeries 350 is the strong value choice in its class.

What is the difference between the PSB SubSeries 350 and the PSB SubSeries 450?

The PSB SubSeries 450 is PSB's DSP-controlled flagship subwoofer, featuring a 12" active driver with dual 10" passive radiators, a 400W RMS Hypex nCore amplifier developed by NAD, and DSP linearization that achieves a flat response dead flat to 20Hz. The SubSeries 350 uses a simpler sealed design with a 12" front-firing driver and a 300W NAD Class D MOSFET amplifier without passive radiators or DSP, achieving 25Hz (±3dB). The SubSeries 450 delivers deeper bass extension and higher maximum SPL in a similarly compact cabinet; the SubSeries 350 offers the core PSB sealed subwoofer design at a more accessible investment. Both were voiced by Paul Barton at the NRC and share the same trickle-down engineering principles from PSB's flagship subwoofer development.

Can the PSB SubSeries 350 be used without a dedicated subwoofer output on my amplifier?

Yes, the SubSeries 350 is one of the more versatile subwoofers in this regard. If your amplifier or AV receiver lacks a dedicated subwoofer or LFE output, you can connect it via the stereo RCA line-level inputs from a preamplifier output, or via the speaker-level inputs directly from the amplifier's speaker binding posts. The speaker-level outputs are high-passed at 80Hz/12dB octave, so they pass midrange and treble to the connected main speakers while routing bass frequencies to the SubSeries 350, providing effective bass management even without receiver-based bass management features.

What is PSB's smart bass limiting circuitry?

PSB's proprietary smart bass limiting circuitry monitors both the amplifier output level and the 12" woofer's cone excursion in real time. When either parameter approaches its safe maximum, the circuitry reduces gain in a way that preserves sound quality and prevents audible clipping or driver damage without introducing the sudden, harsh compression that conventional protection circuits can cause. Under normal operating conditions at typical listening levels, the smart limiting is inactive and the SubSeries 350 plays without any dynamic restriction.

Where can I buy the PSB SubSeries 350 in Toronto or Canada?

The PSB SubSeries 350 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 subwoofer selection, placement, crossover and phase alignment with main speakers, and system integration for home theatre and two-channel audiophile setups throughout the Greater Toronto Area and across Canada.

Does the PSB SubSeries 350 support wireless operation?

The SubSeries 350 does not include a built-in wireless receiver, but its rear-panel USB power output is specifically designed to power the optional Bluesound RT100 wireless transmitter/receiver accessory (sold separately). With the RT100 in place, the SubSeries 350 can receive audio wirelessly from an AV receiver's LFE or subwoofer output, eliminating the need for a long cable run across the room to the subwoofer's final placement position.