PSB CSIR SUB 10" Passive In-Room Subwoofer at Vinyl Sound Toronto Canada

The CSIR SUB is an ultra-slim 10-inch passive in-room subwoofer from PSB Speakers (Pickering, Ontario, Canada), available at Vinyl Sound in Toronto, Canada. Part of PSB's CustomSound CI line and originally previewed at CEDIA 2019, the CSIR SUB solves one of custom installation's most persistent challenges: delivering deep, accurate bass without a conventional floor-standing enclosure. Measuring just 15-3/4 x 15-3/4 x 4-3/4 inches without its base, the CSIR SUB offers three distinct placement modes and integrates IsoAcoustics isolators for improved acoustic decoupling. A high-excursion 10-inch Glass fiber / PMI foam sandwich cone driver with dual rubber surround and balanced drive motor delivers a frequency response of 25 Hz to 150 Hz at 8 ohms nominal. Designed and voiced by PSB founder Paul Barton, the CSIR SUB is ideally paired with the PSB CS 500W subwoofer amplifier and is available in Black and White.

Three Placement Modes and IsoAcoustics Integration

The CSIR SUB's defining advantage is its three placement configurations, each supplied with the necessary hardware. In floor-standing mode, the CSIR SUB sits upright on its included narrow low-profile base with integrated IsoAcoustics isolators, which manage resonance and vibration transfer between the cabinet and the floor surface for cleaner, more focused bass. In the laid-flat mode, the CSIR SUB is placed on its back and tucked out of sight behind a sofa, under a media unit, or beneath a bed, functioning as a fully invisible bass foundation for the room. In wall-mounted mode, the included bracket allows the CSIR SUB to be fixed to any wall surface, eliminating floor space demands entirely. All three modes deliver the same driver and sealed cabinet performance — the choice of placement is dictated entirely by the room layout and the installer or homeowner's preference.

High-Excursion Shallow Driver and Paul Barton Voicing

The CSIR SUB's 10-inch driver is purpose-built for a shallow-depth enclosure, using a Glass fiber and PMI (polymethacrylimide) foam sandwich cone construction that maximises stiffness while minimising mass. This sandwich cone design allows the driver to maintain accurate, controlled motion across its full excursion range without the cone flex that would compromise a conventional driver forced into a similarly shallow cabinet. The die-cast basket provides a rigid, non-resonant mounting structure, and the dual rubber surround gives the driver the compliance needed for high-excursion operation at low frequencies. A balanced drive motor structure ensures even force distribution across the voice coil gap for consistent, low-distortion output. Final voicing was performed by PSB founder Paul Barton, applying the same acoustic philosophy used across the full PSB CustomSound and Imagine speaker ranges to deliver tight, detailed bass suited to both music and home theatre content.

Key Features

• Ultra-Slim 10-Inch Passive In-Room Subwoofer: A 4-3/4-inch depth profile allows the CSIR SUB to be placed in spaces where conventional subwoofer enclosures are impractical, without sacrificing 25 Hz bass extension.
• Three Placement Configurations: Floor-standing on supplied base with IsoAcoustics isolators, laid flat for concealment behind or under furniture, or wall-mounted using the supplied bracket — all hardware included.
• IsoAcoustics Isolators (Floor-Standing Mode): Integrated IsoAcoustics isolation feet manage resonance and vibration transfer between the cabinet and the floor for improved bass clarity and reduced low-frequency smearing.
• Glass Fiber / PMI Foam Sandwich Cone: A composite driver cone combining glass fibre skins with a PMI foam core delivers high stiffness with low mass for accurate, high-excursion bass reproduction in a shallow cabinet depth.
• Dual Rubber Surround and Balanced Drive Motor: Dual rubber surrounds provide controlled compliance for long-throw operation; a balanced drive motor structure ensures even force distribution and low distortion at all output levels.
• Frequency Response 25 Hz to 150 Hz: Deep bass extension to 25 Hz from a 4-3/4-inch-deep enclosure, covering the full subwoofer operating range for music and home theatre.
• Sensitivity 88 dB Anechoic / 90 dB Listening Room: High driver efficiency enables meaningful output from amplifiers rated as low as 40 watts, with a recommended ceiling of 200 watts.
• 8 Ohm Nominal Impedance: Compatible with any amplifier rated for 8 ohm loads, with the PSB CS 500W subwoofer amplifier as the recommended pairing.
• CS 500W Amplifier Compatibility: The PSB CS 500W is specifically configured for the CSIR SUB, with DSP-based room calibration and the ability to drive two CSIR SUB units simultaneously from a single chassis.
• MDF Cabinet Construction: A rigid MDF enclosure with acoustic transparent cloth grille face and wood grille frame delivers both structural integrity and a furniture-quality finished appearance.
• Available in Black and White: Two finish options allow the CSIR SUB to integrate with a wide range of interior design schemes in both residential and commercial custom installation environments.
• Paul Barton Voicing: Designed and voiced by PSB founder Paul Barton, drawing on over 50 years of Canadian acoustic research and PSB's CustomSound CI engineering heritage.

Technical Specifications

Placement at a Glance

• Floor-standing: upright on supplied low-profile base with integrated IsoAcoustics isolators
• Laid flat: on its back, tucked behind a sofa, under a media unit, or beneath furniture
• Wall-mounted: fixed to any wall surface using the supplied mounting bracket
• Passive design: requires external amplifier (PSB CS 500W recommended)
• CS 500W installs in the equipment rack and drives up to two CSIR SUB units simultaneously
• Available in Black and White to match room decor

Frequently Asked Questions

What is the PSB CSIR SUB?

The PSB CSIR SUB is an ultra-slim 10-inch passive in-room subwoofer from PSB Speakers, designed and voiced in Pickering, Ontario, Canada. It measures 15-3/4 x 15-3/4 x 4-3/4 inches without its base and offers three distinct placement configurations: floor-standing on its supplied base with IsoAcoustics isolators, laid flat behind or under furniture, and wall-mounted using the included bracket. The CSIR SUB delivers a frequency response of 25 Hz to 150 Hz at 8 ohms nominal and is designed for pairing with the PSB CS 500W subwoofer amplifier.

How does the PSB CSIR SUB compare to the SVS SB-1000 Pro and KEF Kube 10b?

The PSB CSIR SUB, SVS SB-1000 Pro, and KEF Kube 10b are all compact premium subwoofers for listeners who want high performance in a reduced footprint. The SVS SB-1000 Pro is a powered sealed subwoofer with smartphone DSP control in a conventional cubic enclosure. The KEF Kube 10b is a powered design with a larger amplifier and more conventional form factor. The CSIR SUB differentiates as a passive design with three unique placement configurations, IsoAcoustics isolation in floor-standing mode, and a 4-3/4-inch depth profile that allows installation in spaces that no conventional subwoofer enclosure can access. For custom installation professionals and design-conscious homeowners where aesthetics and placement flexibility are as important as bass performance, the CSIR SUB addresses a need that the SVS and KEF products do not.

What are IsoAcoustics isolators and why do they matter in the CSIR SUB?

IsoAcoustics isolators are purpose-designed acoustic isolation devices that decouple a speaker or subwoofer from the surface it rests on, reducing the transfer of vibrational energy between the cabinet and the floor. When integrated into the CSIR SUB's base, they prevent low-frequency energy from coupling into the floor structure and being re-radiated as a diffuse, ill-defined bass bloom. The result is bass that remains focused and articulate at the listening position, with improved pitch definition and transient clarity compared to a subwoofer resting directly on a hard floor or carpet. IsoAcoustics technology is widely used in professional studio monitoring and is increasingly specified in high-performance custom installation projects.

Does the PSB CSIR SUB work in the laid-flat position as well as upright?

Yes. The CSIR SUB's driver and sealed cabinet design perform identically in all three placement orientations. In the laid-flat position, the CSIR SUB rests on its back with the driver facing upward, allowing it to be placed on the floor behind a sofa, on a low shelf, or under a bed frame. The sealed cabinet means there is no port direction to optimise and no placement-dependent bass colouration. PSB has voiced the CSIR SUB to deliver consistent performance regardless of orientation, making it suitable for any of the three configurations in real-world room conditions.

Can the PSB CSIR SUB be used without the PSB CS 500W amplifier?

Yes. The CSIR SUB is a passive 8-ohm subwoofer compatible with any external amplifier rated for 8 ohm loads and delivering between 40 and 200 watts. The PSB CS 500W is the recommended pairing because it includes a dedicated EQ preset specifically tuned for the CSIR SUB's driver and cabinet characteristics, DSP-based room calibration, and the ability to drive two CSIR SUB units simultaneously. Using a different amplifier is technically possible but will not provide the CS 500W's tailored frequency shaping for this specific driver and enclosure combination.

Is the PSB CSIR SUB suitable for music as well as home theatre?

Yes. Paul Barton voiced the CSIR SUB specifically for both music and home theatre applications, applying the same acoustic priorities used across PSB's Imagine and Alpha speaker families. The Glass fiber / PMI foam sandwich cone driver and sealed cabinet produce bass that is fast and pitch-accurate enough for acoustic bass, kick drums, and complex musical passages, while still delivering the dynamic range and low-frequency extension that home theatre soundtracks require. The IsoAcoustics isolators in floor-standing mode further enhance musical articulation by reducing the floor-coupling resonances that can blur pitch definition on bass instruments.

Where can I buy the PSB CSIR SUB in Toronto or Canada?

The PSB CSIR SUB 10" Passive In-Room Subwoofer is available in Toronto, Canada at Vinyl Sound, an authorised PSB Speakers dealer. Vinyl Sound carries the CSIR SUB in both Black and White finishes and can advise on pairing with the PSB CS 500W subwoofer amplifier, placement configuration, and multi-unit system design. Customers across Canada are welcome to contact Vinyl Sound for purchasing, project consultation, and shipping inquiries.