HK Audio CM-4 - 60W 4-inch Passive 2-Way 70V/100V Ceiling Loudspeaker with Backcan and 145-Degree Conical Dispersion in Black/White Grille Finish

The HK Audio SI Series CM-4 is a high-performance 4-inch coaxial in-ceiling speaker, designed for delivering exceptional audio quality in a variety of professional installation environments. It is ideal for applications requiring clear and articulate sound reproduction for both music and speech, making it perfect for use in restaurants, hotels, conference rooms, retail outlets, and more. With a unique 4" polypropylene woofer/midrange transducer and a 0.75" aluminum dome tweeter, this speaker provides an impressive frequency response and high sound pressure levels. It also offers a solution for electro-acoustic emergency warning systems (ENS) in compliance with EN 50849, making it an ideal choice for public address systems.

One of the standout features of the CM-4 is its compact size and coaxial design, which enables it to deliver excellent sound performance while maintaining a discreet presence in the ceiling. The speaker is equipped with a newly developed passive crossover, ensuring minimal distortion and optimal frequency distribution. The crossover is paired with a self-healing HF protection circuit, ensuring maximum reliability and longevity in fixed installations. This attention to detail guarantees that the CM-4 maintains superior sound quality, even in demanding environments.

For installation flexibility, the CM-4 includes a front-accessible rotary switch that allows users to easily switch between low-impedance (8 ohms) or high-impedance (100V/70V) modes, with selectable power taps for easy integration into larger audio systems. This versatility makes the CM-4 suitable for both high-power environments and installations with lower power requirements. Additionally, two cover plates are provided for cable routing, with either curved outlets or a PG gland hole for added convenience.

The CM-4 is built for durability, with a stiffened steel back can that makes it completely resonance-free, ensuring clear and accurate sound reproduction without unwanted coloration. Its robust construction is further supported by a metal back-can and a foam-backed grille, ensuring long-lasting performance in both indoor and high-traffic environments. The unit is also designed with safety features, including mounting clamps and the option to attach safety wires or cables. The rimless, magnetic grille provides an aesthetically pleasing look while ensuring easy access for maintenance.

Whether used as part of a larger system with subwoofers like the SI Series S210 V or Fineo FO S112 (F), or as a standalone speaker for background music and speech reinforcement, the CM-4 is a versatile, reliable, and high-quality solution for professional installations. The speaker's compatibility with various DSP platforms such as Biamp Tesira, BSS, Lab.gruppen, and QSC Q-SYS, along with its simulation data in GLL format for EASE and EASE EVAC, ensures precise planning and integration into any project.

Features

• Coaxial 4" polypropylene woofer/midrange transducer and 0.75" aluminum dome tweeter for clear, high-quality sound
• Passive crossover with self-healing HF protection circuit for maximum operational reliability in fixed installations
• Front-accessible rotary switch for easy switching between low-impedance (8 ohms) or high-impedance (100V/70V) operation
• Includes two cover plates for flexible cable routing: curved outlet or PG gland hole
• Ball-impact resistance certification in accordance with DIN 18032-3 for installations in sports facilities
• Available in black and white front grilles, magnetically attached for easy installation
• Certified for use as part of an electro-acoustic emergency warning system (ENS) in accordance with EN 50849
• Compact, low-resonance back-can design with foam-backed grille for superior sound quality and durability
• Optional C-rings and tile bridges for installation in suspended ceiling systems with limited load-bearing capacity
• Compatible with a range of DSP platforms including Biamp Tesira, BSS, Lab.gruppen, and QSC Q-SYS
• Easy to integrate with subwoofers like the SI Series S210 V or Fineo FO S112 (F) for enhanced low-frequency response

Specifications

Characteristics

• Concept: Ceiling Mounted Speaker
• Cabinet Principle: Bass reflex
• Power Handling RMS: 30 W (Low-Z), 15 W max. (High-Z 100 V)
• Power Handling Program: 60 W (Low-Z)
• Power Handling Peak: 120 W (Low-Z)
• Power Handling 100 V (5 Taps): 15 W, 12.5 W, 10 W, 7.5 W
• Power Handling 70 V (5 Taps): 7.5 W, 6.3 W, 5 W, 3.8 W
• Nominal Impedance (Low-Z): 8 ohms
• Nominal Impedance (High-Z Power Taps): 670 ohms, 800 ohms, 1000 ohms, 1300 ohms
• Maximum SPL Average: 102 dB
• Maximum SPL Average (High-Z, 15 W Tap): 99 dB
• Maximum SPL Peak (Low-Z): 107 dB
• Maximum SPL Peak (High-Z, 15 W Tap): 103 dB
• Sensitivity 1W/1m (Low-Z): 85 dB
• Crossover Frequency: 3.6 kHz
• Frequency Range (-6 dB): 81 Hz - 20 kHz
• Frequency Range (-10 dB): 64 Hz - 20 kHz
• Dispersion Angle (-6 dB, Circular): 145°

Certifications

• Flame Retarding ABS (IEC 60695-11-10/-20) Class V-0/5VB: Certified
• Ball Impact Resistance (DIN 18032-3): Not specified
• IP Protection Class (EN 60529): Not specified (Indoor use only)

Components

• Low-/Mid Frequency: 4-inch polypropylene speaker with ferrite magnet and 1-inch voice coil
• High Frequency: 0.75-inch aluminum dome tweeter with neodymium magnet and 0.75-inch voice coil with ferrofluid
• Crossover: High pass 18 dB/octave, Low pass 12 dB/octave
• Horn: Integrated wave guides

Connections

• Input: 2-pole Euroblock connector
• Output/Parallel Output: 2-pole Euroblock connector, wired in parallel

Amping/Filter Sheets

• Filter Specifications: Tabular form for frequency response equalization without limiter specifications
• Compatible Brands: Biamp Tesira, BSS, Lab.gruppen, Lake, Lab.gruppen IPD/IPX, LEA Professional, Linea Research, Marani, Powersoft, QSC Q-SYS, Ram Audio, Symetrix

Mechanical Data

• Mounting Clamps: 3 x front-accessible mounting clamps with max. 40 mm (0.4-inch) grip range
• Safety Features: 2 x bracket for safety wires/chains or cable fastening
• Cover Plates: 2 x cover plates included, with curved cable entries or with hole for PG gland
• Rotary Switch for Power Taps: 1 x front-accessible rotary switch for bypassing the transformer for low-impedance (8 ohms) operation or for power taps at 100/70 V
• Cabinet Material: Metal back-can with low-resonance, partially curved shape
• Color: Black and white front grille included
• Front Grille: Rimless design with magnetic attachment
• Optional Accessories: C-ring and tile bridges
• Dimensions (Diameter x Total Depth x Installation Depth): 8.82 x 6.7 (6.73) inches
• Cut-Out Diameter: 192 mm (Template Included)
• Weight: 5.95 lbs