CMX DA-240 240W Class-D Power Amplifier
September 17, 2026
CMX CSK-66H 6.5″ Frameless Ceiling Speaker (6W/3W)
► 6.5″ Full-Range Transducer: High-efficiency paper cone delivers crisp vocal paging and warm background music.
► Frameless Architectural Grille: Ultra-thin magnetic-style white metal mesh blends flush into commercial ceilings.
► Multi-Tap 100V Transformer: Built-in line matching transformer provides selectable 6W and 3W power taps.
► High 93 dB Sensitivity: Wide sound dispersion provides clear acoustic coverage with minimal amplifier wattage.
► Fast Spring-Clip Mounting: Heavy-duty spring clamps ensure fast, tool-free installation into false ceiling cutouts.
► Standard Ø165mm Cutout: Compact Ø188mm outer diameter fits standard commercial ceiling tiles and gypsum boards.
► Durable ABS Baffle: Fire-resistant, lightweight ABS chassis prevents resonance and ensures long-term acoustic reliability.
► Commercial 100V Audio Line: Supports parallel daisy-chaining across corporate offices, retail stores, and hotels.
CMX Audio Commercial Solutions
CMX CSK-66H 6.5″ Frameless Ceiling Speaker
Architectural Ultra-Thin Frameless In-Ceiling Loudspeaker with 6.5″ Full-Range Transducer & 100V Multi-Tap Matching Transformer (6W / 3W)
The CMX CSK-66H is a commercial 6.5-inch in-ceiling loudspeaker engineered for premium background music (BGM) and voice paging across modern commercial interiors. Designed with an ultra-thin architectural frameless white metal grille, it integrates flush into false ceilings without unsightly bezels. Powered by a high-efficiency 6.5″ paper cone driver and a built-in 100V line matching transformer with 6W and 3W power taps, the CSK-66H delivers wide sound dispersion, high 93 dB sensitivity, and crisp speech intelligibility for commercial spaces across India.
Ideal For
- ✓ Corporate Offices & IT Parks
- ✓ Retail Showrooms & Fashion Boutiques
- ✓ Hotels, Cafes & Restaurants
- ✓ Hospitals & Healthcare Clinics
- ✓ School & College Corridors
- ✓ Airport Lounges & Transit Terminals
- ✓ Bank Branches & Customer Service Centers
Core Engineering Features
6.5″ High-Efficiency Paper Cone
Wide-diameter 6.5-inch full-range paper driver reproduces balanced low-end warmth and crystal-clear vocal announcements from 100 Hz to 15 kHz.
Architectural Frameless Design
Bezel-free micro-perforated white metal grille fits seamlessly into drywall, gypsum boards, and acoustic ceiling tiles for a modern minimalist look.
Built-In 100V Matching Transformer
Equipped with selectable 6W and 3W power taps to balance sound pressure levels across varied ceiling heights and room acoustic requirements.
High Sensitivity Output (93 dB)
Produces 93 ± 3 dB SPL at 1W/1m, delivering ample acoustic volume and coverage with minimal amplifier wattage draw.
Tool-Free Spring Clip Installation
Dual heavy-duty spring-loaded mounting clamps ensure secure, fast ceiling mounting into standard Ø165mm ceiling cutouts in seconds.
Lightweight Anti-Resonant ABS Chassis
Rigid ABS polymer baffle dampens unwanted mechanical resonance while maintaining an ultra-light 0.7 kg weight for easy ceiling handling.
Recommended Amplifier Pairings
Commercial 100V mixer and booster amplifiers matched for the CMX CSK-66H based on room scale and speaker quantity:
Small Spaces • Up to 8 Speakers
Medium–Large Floors • Up to 32 Speakers
High-Density Booster • 1U Rack
Multi-Zone Facilities
100V Line Wiring & Tap Calculation Guide
80% Safety Headroom Rule: Total connected speaker wattage must not exceed 80% of the amplifier’s rated RMS capacity (e.g., maximum 48W speaker load on a 60W amplifier) to prevent audio distortion and transformer overheating.
Recommended Power Tap by Ceiling Height:
Quick Amplifier Sizing Matrix (at 80% Usable Load):
- Parallel Wiring: Connect all speakers in parallel (+ to 100V line, – to COM). No impedance matching math needed.
- Ceiling Cutout: Prepare a clean circular ceiling hole of Ø165 mm. The frameless outer diameter is Ø188 mm, covering the cutout seamlessly.
Technical Specifications
| Parameter | Details |
|---|---|
| Model | CSK-66H |
| Brand | CMX Audio |
| Product Type | Frameless Commercial In-Ceiling Loudspeaker |
| Speaker Driver | 6.5″ Full-Range Paper Cone Transducer |
| Rated Power Output | 6 Watts RMS |
| Power Tappings (@100V) | 6W, 3W |
| Line Input Voltage | 100V / 70V Constant Voltage Distributed Audio Line |
| Sensitivity (1W/1m) | 93 ± 3 dB |
| Frequency Response | 100 Hz – 15 kHz |
| Enclosure & Finish | ABS baffle and frameless metal grille in architectural white |
| Mounting Mechanism | Heavy-duty spring clamps for fast in-ceiling snap fit |
| Ceiling Cutout Diameter | Ø 165 mm |
| Overall Dimensions (Dia × Depth) | Ø 188 mm × 76 mm |
| Net Weight | 0.7 kg |
Frequently Asked Questions
What makes the CMX CSK-66H frameless ceiling speaker unique?
The CSK-66H features an ultra-thin frameless white metal grille that covers the outer rim completely. This provides an almost invisible, flush ceiling aesthetic favored by modern architects and interior designers, while the 6.5-inch driver delivers warm background audio and high voice clarity.
What is the ceiling cutout diameter required for installation?
The speaker requires a circular ceiling cutout diameter of Ø165 mm with a mounting depth of 76 mm. Its outer flange diameter is Ø188 mm, providing a clean overlap that hides any cutout imperfections.
How do I select between the 6W and 3W power taps?
The built-in multi-tap 100V transformer has color-coded primary wiring leads. Selecting the 3W tap is standard for general offices and retail spaces with ceilings under 3.2 meters, while the 6W tap provides extra volume for corridors, lobbies, and louder ambient spaces.
Which commercial amplifiers pair best with the CMX CSK-66H in India?
The speaker is compatible with standard 100V distributed amplifiers. Recommended models include the CMX EA-30 (up to 8 units at 3W), CMX EA-120 (up to 32 units), CMX DA-240 (up to 64 units), and CMX PA-6120MX / PA-4500MX multi-zone matrix systems for multi-floor routing.
How many CSK-66H speakers can be connected to a single amplifier?
Apply the 80% safety headroom rule: multiply the amplifier’s rated RMS wattage by 0.8, then divide by the chosen speaker tap. For instance, a 120W amplifier provides 96W of usable power, supporting up to 32 units tapped at 3W or 16 units tapped at 6W.
Need Commercial AV System Design or B2B Pricing 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.
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ProjecXive India –
The CMX CSK-66H 6.5″ Frameless Ceiling Speaker is an outstanding commercial audio solution. It delivers excellent speech intelligibility, smooth background music reproduction, and a sleek bezel-free design that integrates seamlessly into modern ceilings. Verified and highly recommended by ProjecXive India for commercial AV installations.