Klipsch SLM-3400-C In-Ceiling Speaker at Vinyl Sound Toronto Canada

The SLM-3400-C is a shallow-depth 4" two-way in-ceiling speaker from Klipsch (Indianapolis, Indiana, USA), available at Vinyl Sound in Toronto, Canada. Part of the Klipsch Reference 3000 architectural series and the SLM (Shallow Depth) lineup, it is engineered specifically for installations where standard ceiling cavity depth is unavailable. At just 50 mm (approximately 2 inches) of mounting depth with a fully enclosed fire-rated galvanized metal back box included, the SLM-3400-C installs in ceiling cavities that would be physically impossible for conventional in-ceiling speakers. It pairs a 4" Injection Molded Graphite (IMG) woofer with a 1" Aluminum Dome Tweeter mated to a custom round Tractrix Horn, delivering a frequency response of 92 Hz to 20 kHz at 90 dB sensitivity. For homes and commercial installations in Toronto and across Canada with I-joist construction, concrete slab ceilings, drop ceilings with minimal plenum space, or multi-story buildings with thin floor assemblies, the SLM-3400-C delivers Reference 3000-series acoustic quality from the most space-constrained ceiling installation on the market.

Big Sound, Slim Package: The 50mm Shallow-Depth Advantage

The SLM-3400-C's defining characteristic is its 50 mm total enclosure depth, achieved through a purpose-designed ported ABS baffle combined with an ultra-slim galvanized metal back box. Standard residential in-ceiling speakers typically require 100 mm to 170 mm of ceiling cavity depth to accommodate their enclosure and driver assembly. The SLM-3400-C requires just 50 mm, making it suitable for engineered lumber I-joist construction where the floor system reduces available plenum height, concrete or composite decking ceilings, drop ceilings with minimal gap between the tile grid and the structural floor above, and any renovation or retrofit project in Toronto and across Canada where a conventional in-ceiling speaker will not physically fit. The entire assembly, including the fire-rated metal back box, installs into this minimal depth, with no additional ceiling cavity volume required beyond the enclosure itself.

Fire-Rated Galvanized Metal Back Box with Ported Acoustic Design

The ultra-slim galvanized metal back box included with every SLM-3400-C performs multiple essential functions simultaneously. As a fully enclosed acoustic enclosure, it isolates the rear of the 4" IMG woofer from the ceiling cavity, ensuring consistent bass loading and low-frequency response regardless of the acoustic properties or volume of the space above the ceiling. The ported ABS baffle extends low-frequency output below what a sealed enclosure of the same depth could produce, maximizing bass performance from the compact 4" driver within the 50 mm constraint. The galvanized steel construction is fire-rated, meeting the enclosure requirements for installations in ceiling cavities subject to building code fire resistance standards across Canada and in multi-dwelling residential construction. This built-in fire-rated enclosure eliminates the need for a separately purchased back box that most standard in-ceiling speakers require for code compliance in these environments, providing a meaningful cost and installation time advantage for commercial and residential projects across Toronto and Canada.

Reference 3000 Acoustics: 4" IMG Woofer and Tractrix Horn

Despite its extremely shallow depth and compact 4" woofer format, the SLM-3400-C draws its acoustic components from Klipsch's Reference 3000 architectural series. The 4" Injection Molded Graphite woofer uses a composite cone with graphite fiber content for higher stiffness and better internal damping than a standard polypropylene cone of the same size, producing tighter bass and cleaner midrange reproduction. The 1" Aluminum Dome Tweeter is mated to a custom round Tractrix Horn that controls high-frequency dispersion and provides horn-loaded efficiency, delivering detailed, focused highs to 20 kHz. This combination brings the acoustic character of the Reference 3000 series into a speaker that is physically among the most compact in-ceiling designs available on the market, providing a performance standard that standard low-cost shallow-mount speakers with conventional drivers cannot approach.

Key Features

• 50 mm Shallow Mounting Depth with Included Fire-Rated Back Box: The complete speaker assembly, including its fully enclosed galvanized metal fire-rated back box, installs in just 50 mm of ceiling cavity depth. This is among the shallowest profiles available in a quality two-way in-ceiling speaker, enabling installation in I-joist construction, concrete slab ceilings, drop ceilings, and thin-floor multi-story buildings where standard in-ceiling speakers cannot be accommodated.
• 4" Injection Molded Graphite (IMG) Woofer: IMG composite cone material from the Klipsch Reference 3000 architectural series delivers higher stiffness and better damping than standard polypropylene, producing tighter bass and cleaner midrange from the compact 4" driver within the SLM-3400-C's shallow enclosure.
• 1" Aluminum Dome Tweeter with Custom Round Tractrix Horn: Aluminum dome tweeter mated to a Klipsch Tractrix Horn controls high-frequency dispersion and delivers horn-loaded efficiency for detailed, focused highs to 20 kHz. Horn loading provides more controlled and efficient treble output than an equivalent non-horn-loaded aluminum dome tweeter in the same shallow format.
• 90 dB Sensitivity, 120W Peak Power Handling: Efficient enough for standard AV receivers and distributed audio amplifiers, with 120W peak power handling providing dynamic headroom well above the recommended 50W continuous operating level.
• Ported ABS Baffle for Extended Low-Frequency Output: The ported baffle design maximizes bass output below what a sealed enclosure of the same minimal 50 mm depth could produce, ensuring the 4" IMG woofer delivers the best possible low-frequency performance given the physical constraints of the shallow-ceiling installation format.
• SlimTrim Flat Magnetic Grille, Round and Square Included: The flat minimum-bezel magnetic grille creates a modern, discreet appearance with minimal visual intrusion into the ceiling. Both round and square grille options are included in the box to match any ceiling design or interior aesthetic. The grilles are paintable and attach magnetically for clean appearance and tool-free removal.
• 8-Ohm Nominal Impedance, 12-Gauge Wire Compatible: Standard 8-ohm impedance provides broad compatibility with all AV receivers, stereo amplifiers, and distributed audio systems. Wiring terminals accept up to 12-gauge speaker wire for low-resistance cable runs in larger residential and commercial installations.
• Compatible with IK-650-C Install Kit: The optional IK-650-C installation kit (sold separately) provides pre-wire brackets and marking aids for new construction rough-in before drywall application.

How the SLM-3400-C Compares to the SLM-5400-C

The SLM-3400-C and SLM-5400-C share the same 50 mm shallow depth, fire-rated metal back box format, 9.5-inch overall diameter, 8.3-inch cutout dimension, and SlimTrim flat magnetic grille design. The key difference is driver materials: the SLM-3400-C uses an IMG woofer and Aluminum Dome Tweeter from the Reference 3000 architectural series, while the SLM-5400-C uses a Cerametallic woofer and Titanium Dome Tweeter from the higher-tier Reference 5000 architectural series. The SLM-5400-C's Cerametallic cone and titanium tweeter provide a higher stiffness-to-mass ratio and extended high-frequency response to 20 kHz at 91 dB sensitivity versus the SLM-3400-C's 90 dB. For distributed audio installations in Toronto and Canada where Reference 3000-level performance meets the specification and budget requirements, the SLM-3400-C is the appropriate choice. Both models are the right solution whenever ceiling depth is the constraining factor.

Technical Specifications

What's in the Box

• Klipsch SLM-3400-C In-Ceiling Speaker (1 unit)
• Ultra-Slim Galvanized Metal Fire-Rated Back Box (integrated)
• Round Flat Magnetic Grille
• Square Flat Magnetic Grille
• Note: Installation Kit IK-650-C sold separately

Frequently Asked Questions

What is the Klipsch SLM-3400-C?

The Klipsch SLM-3400-C is a shallow-depth 4" two-way in-ceiling speaker from the Reference 3000 architectural series, featuring a 4" IMG woofer and a 1" Aluminum Dome Tweeter with a custom round Tractrix Horn, 90 dB sensitivity, and 8-ohm impedance. It installs in just 50 mm (1.97 inches) of ceiling depth with a fully enclosed fire-rated galvanized metal back box included, making it one of the shallowest two-way in-ceiling speakers available. It covers 92 Hz to 20 kHz and is compatible with standard AV receivers and distributed audio amplifiers up to 120W peak.

Where is the Klipsch SLM-3400-C used when a standard in-ceiling speaker cannot fit?

The Klipsch SLM-3400-C is specifically designed for ceiling installations where a standard in-ceiling speaker's 100 mm to 170 mm depth requirement cannot be met. Common applications in Toronto and across Canada include engineered I-joist floor systems where the structural floor assembly significantly reduces available ceiling plenum height, concrete slab or composite deck ceilings in commercial-to-residential conversions, multi-story residential construction with thin floor assemblies between levels, drop ceilings with a narrow gap between the tile grid and the structure above, and renovation projects in finished spaces where ceiling cavity depth cannot be increased without major structural work. Any installation where the available depth above the ceiling surface is less than approximately 100 mm makes the SLM-3400-C's 50 mm total profile the practical solution.

What is the difference between the SLM-3400-C and the SLM-5400-C, and which should I choose?

The Klipsch SLM-3400-C and SLM-5400-C share the same 50 mm shallow-depth format, fire-rated metal back box, 9.5-inch overall diameter, and SlimTrim magnetic grille design. The SLM-3400-C uses a 4" IMG woofer and Aluminum Dome Tweeter from the Reference 3000 series at 90 dB sensitivity. The SLM-5400-C uses a 4" Cerametallic woofer and Titanium Dome Tweeter from the Reference 5000 series at 91 dB sensitivity. The SLM-5400-C's Cerametallic cone delivers higher rigidity and better damping than the IMG cone, and the titanium dome tweeter produces higher-stiffness diaphragm performance than the aluminum dome. The SLM-3400-C is the right choice when Reference 3000-level acoustic quality meets the project specification. The SLM-5400-C is preferred for higher-demand listening environments where Reference 5000-level driver materials and slightly higher efficiency justify the premium. Both are equally valid shallow-ceiling solutions when depth is the primary constraint.

Does the SLM-3400-C include a back box, and is it fire-rated?

Yes, the Klipsch SLM-3400-C includes an ultra-slim galvanized metal back box that is integral to the speaker and ships with every unit at no additional cost. The galvanized steel construction is fire-rated, meeting the enclosure requirements for installations in wall and ceiling cavities subject to fire resistance standards under Canadian and North American building codes. The back box also functions as the speaker's acoustic enclosure, isolating the rear of the 4" IMG woofer and providing the consistent acoustic loading required for accurate bass response. Unlike most conventional in-ceiling speakers that require a separately purchased back box to meet fire code requirements, the SLM-3400-C's fire-rated enclosure is already included, reducing both total installation cost and the number of components to coordinate on a project.

How does the Klipsch SLM-3400-C compare to the Sonance 4R or Polk Audio VS series for shallow-ceiling installations?

The Klipsch SLM-3400-C differentiates itself from the Sonance 4R and Polk Audio VS series through its included fire-rated enclosure, Tractrix Horn tweeter loading, and Reference 3000 acoustic pedigree. The SLM-3400-C's Tractrix Horn provides more controlled and efficient high-frequency dispersion than the conventional dome tweeter arrangements in the Sonance and Polk Audio alternatives, producing clearer treble detail from the compact 4" format. The SLM-3400-C's fire-rated back box is included in the box at no additional cost, while Sonance and other manufacturers require a separately purchased enclosure for fire-code compliance, adding cost and installation steps for commercial and multi-dwelling projects across Toronto and Canada.

What amplifier power does the Klipsch SLM-3400-C require?

The Klipsch SLM-3400-C is compatible with any standard AV receiver or distributed multi-room amplifier rated for an 8-ohm load. Klipsch recommends 50W of amplifier power for standard use, and the 90 dB sensitivity means the speaker produces adequate output from modest power levels. The 120W peak power handling provides substantial dynamic headroom above the recommended amplifier power. Standard multi-zone distributed audio amplifiers used in whole-home audio systems across Toronto and Canada are fully compatible without any special high-power amplification requirement.

Where can I buy the Klipsch SLM-3400-C in Toronto or Canada?

The Klipsch SLM-3400-C is available at Vinyl Sound, an authorized Klipsch dealer in Toronto, Canada. Vinyl Sound carries the full Klipsch SLM Shallow Depth series, including both the SLM-3400-C and SLM-5400-C, and can assist with speaker selection, shallow-ceiling installation planning, and system design for whole-home audio and distributed audio projects throughout the Greater Toronto Area and across Canada.