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CMX CSK-56PC 5″ Ceiling Speaker with Fireproof Back Box
► Fireproof Back Box: Flame-retardant red dome enclosure prevents smoke and fire spread into ceiling voids.
► EN54-24 Certified: Fully certified for emergency voice alarm and evacuation systems across commercial facilities.
► Multi-Tap 100V/70V: Selectable 6W, 3W, 1.5W, and 0.75W power taps for distributed background audio.
► 5″ Dual-Cone Driver: Delivers exceptional speech intelligibility and crisp background music from 150Hz to 15kHz.
► Frameless Magnetic Grille: Minimalist ultra-thin white metal grille blends discreetly into modern commercial ceilings.
► Spring-Clip Installation: Heavy-duty spring clamps ensure fast, secure in-ceiling mounting in Ø140mm cutouts.
► Thermal Fuse Protection: Features ceramic wiring block and thermal fuse to protect the audio line.
► Ideal Application Zones: Perfect for corporate offices, retail spaces, hotels, corridors, and evacuation routes.
CMX Audio Commercial Solutions
CMX CSK-56PC 5″ Ceiling Speaker with Fireproof Back Box
EN54-24 Certified Fireproof Frameless 5-Inch Commercial In-Ceiling Loudspeaker with Flame-Retardant Red Back Dome & 100V/70V Multi-Tap Transformer
The CMX CSK-56PC (EN54 Model: FCS-56PEN) is an EN54-24 certified commercial 5-inch in-ceiling loudspeaker engineered for fire alarm voice evacuation (VA) and public address (PA) systems. Featuring a flame-retardant red back dome, ceramic connector terminal with thermal fuse, 5″ dual-cone paper driver, and an architectural frameless white metal grille, it provides life-safety voice announcements and background music across commercial buildings in India.
Ideal For
✓ Shopping Malls & Retail Stores
✓ Hotels & Hospitality Corridors
✓ Fire Evacuation Routes & Stairwells
✓ Hospitals & Healthcare Facilities
✓ Educational Institutes & Auditoriums
✓ Airports & Transit Terminals
Core Engineering Features
EN54-24 Life-Safety Certification
Meets strict fire voice evacuation standards, ensuring uninterrupted emergency broadcasting during fire incidents.
Fireproof Red Back Box Enclosure
Flame-retardant rear dome contains heat and smoke, preventing flame spread into ceiling plenums while enhancing acoustics.
Ceramic Terminal & Thermal Fuse
High-temperature ceramic connector and thermal fuse isolate individual speaker failures, preserving the remaining 100V line.
5″ Dual-Cone Transducer
Wide-range 5-inch paper cone with secondary whizzer delivers crisp vocal clarity and balanced background music across 150 Hz–15 kHz.
Multi-Tap 100V / 70V Transformer
Selectable 6W, 3W, 1.5W, and 0.75W power taps allow precise volume balancing across different ceiling heights and zones.
Architectural Frameless Grille
Ultra-thin metal mesh in neutral architectural white blends flush into false ceilings, gypsum boards, and mineral fiber tiles.
Recommended Amplifier Pairings
Commercial 100V mixer amplifiers matched for the CMX CSK-56PC based on room size and speaker count:
Small Spaces • Up to 8 Speakers
Medium–Large Floors • Up to 32 Speakers
Multi-Zone Facilities
100V Line Wiring & Tap Calculation Guide
80% Safety Headroom Rule: Always size the total connected speaker load to 80% of the amplifier’s rated RMS capacity (e.g., maximum 48W total speaker load on a 60W amplifier) to prevent distortion and line overheating.
Recommended Power Tap by Ceiling Height:
- Parallel Wiring: Connect all speakers in parallel (+ to 100V, – to COM). No impedance matching math needed.
- Fire Survival Cable: For EN54 compliance, use 2-core fire-survival cable (1.5 sq mm) looped through the ceramic terminal block.
Technical Specifications
| Parameter | Details |
|---|---|
| Model | CSK-56PC (EN54 Model: FCS-56PEN) |
| Brand | CMX Audio |
| Product Type | EN54-24 Fireproof Frameless In-Ceiling Speaker |
| Rated Power Output | 6 Watts RMS |
| Power Tappings (@100V) | 0.75W, 1.5W, 3W, 6W |
| Line Input Voltage | 100V / 70V Constant Voltage Line |
| Sensitivity (1W/1m) | 92 ± 2 dB |
| Frequency Response | 150 Hz – 15 kHz |
| Speaker Transducer | 5″ Dual-Cone Full-Range Driver |
| Life Safety Standards | EN54-24 Voice Alarm Certified |
| Enclosure & Finish | ABS baffle, flame-retardant red back box, white frameless metal grille |
| Mounting Mechanism | In-ceiling heavy-duty spring clips |
| Ceiling Cutout Diameter | Ø 140 mm |
| Overall Dimensions | Ø 165 mm × 89 mm |
| Net Weight | 0.5 kg |
Frequently Asked Questions
What makes the CMX CSK-56PC EN54-24 certified for voice alarm systems?
The CSK-56PC incorporates a flame-retardant red back dome, ceramic wiring block, and high-temperature thermal fuse. During a fire event, the fuse prevents electrical shorts on the 100V speaker line, allowing other zones to continue broadcasting emergency evacuation instructions.
What ceiling cutout size is needed to install the CSK-56PC?
The speaker requires a standard ceiling cutout diameter of Ø140mm. The outer frameless metal grille has a diameter of Ø165mm, providing an elegant flush bezel that hides the ceiling cutout cleanly.
Which commercial amplifiers pair best with the CMX CSK-56PC in India?
The speaker is compatible with standard 100V/70V commercial mixer amplifiers. Recommended models include CMX EA-30 (up to 8 units at 3W), CMX EA-120 (up to 32 units), and CMX PA-6120MX / PA-4500MX multi-zone matrix systems for multi-floor routing.
How do I calculate how many CSK-56PC speakers can connect to an amplifier?
Apply the 80% safety headroom rule: multiply the amplifier’s rated RMS wattage by 0.8, then divide by the chosen speaker power tap (6W, 3W, 1.5W, or 0.75W). For example, a 60W amplifier supports 48W of speaker load, which equals up to 16 speakers tapped at 3W.
Is the CMX CSK-56PC suitable for both speech paging and background music?
Yes. Its 5-inch dual-cone transducer delivers 92 dB sensitivity and a wide 150 Hz to 15 kHz frequency response, ensuring crystal-clear spoken paging announcements while rendering pleasing, balanced background music across public spaces.
Need System Design or B2B Pricing for CMX in India?
ProjecXive is an authorized commercial AV solutions partner in India. Contact our sound engineering team for project quotes, acoustic layout design, and official warranty support.
| Rated Power Output | 6W RMS |
|---|---|
| Line Input | 100V, 70V |
| Power Tappings | 6W, 3W, 1.5W, 0.75W |
| Speaker Driver | 5" Dual Cone Driver |
| Sensitivity (1W/1m) | 92 ± 2 dB |
| Frequency Response | 150Hz – 15kHz |
| Fire Certification | EN54-24 Voice Alarm Certified |
| Back Box Enclosure | Flame-Retardant Red ABS Dome |
| Cutout Size | Ø 140 mm |
| Dimensions | Ø 165 mm × 89 mm |
| Net Weight | 0.5 kg |
| Color | White Grille with Red Back Dome |
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ProjecXive India –
The CMX CSK-56PC 5″ Ceiling Speaker with Fireproof Back Box is an excellent choice for commercial and professional AV installations. It delivers outstanding performance, reliable build quality, and seamless integration with standard AV infrastructure. Our team at ProjecXive India has verified this product for professional commercial use. Highly recommended for system integrators and AV designers.