HK Audio CM-8 - 140W 8-inch Passive 2-Way 70V/100V Ceiling Loudspeaker with Backcan and 135-Degree Conical Dispersion in Black/White Grille Finish

The HK Audio SI Series CM-8 is a high-performance 8-inch passive 2-way ceiling speaker designed for premium sound quality in both music and speech applications. Featuring a high-quality 8-inch polypropylene woofer/midrange transducer and a 1-inch aluminum dome tweeter, the CM-8 provides clear, balanced sound and precise high-frequency reproduction. Ideal for installations in venues such as restaurants, hotels, conference rooms, and retail outlets, this speaker excels in spaces where clear, full-range audio is required without sacrificing aesthetic appeal.

With its robust construction, the CM-8 delivers exceptional sound even in acoustically challenging environments. The specially engineered metal back-can ensures resonance-free operation, enhancing sound clarity and preventing unwanted vibrations. The speaker's integrated waveguides and passive crossover further optimize sound quality, ensuring a homogeneous, wide-frequency output. For flexibility in installation, the CM-8 comes with a choice of either a black or white grille that magnetically attaches for easy customization to suit the room's decor.

The CM-8 features an intuitive, front-accessible rotary switch, allowing for easy selection between low-impedance (8 ohms) and high-impedance (100V/70V) operation. This versatility makes it adaptable for a variety of audio setups, from low-impedance configurations in smaller installations to high-impedance systems for larger setups with distributed audio. The rotary switch also enables easy selection of power taps in the high-impedance mode, ranging from 2.5W to 30W for 70V systems and 5W to 30W for 100V systems, providing installation flexibility and ensuring the ideal power output for different environments.

For enhanced security during installation, the CM-8 comes equipped with four front-accessible mounting clamps, and the optional C-rings and tile bridges allow it to be securely installed in suspended ceiling systems with limited load-bearing capacity. This makes the CM-8 an excellent choice for installations in commercial and residential spaces with a need for both reliability and professional-grade sound quality. Additionally, it is certified with flame-retardant ABS (IEC 60695-11-10/-20 Class V-0/5VB), ensuring its safety and durability in public environments.

For projects that demand high-level performance, the CM-8 can also be integrated into an electro-acoustic emergency warning system (ENS) in compliance with EN 50849. Detailed DSP equalization and simulation data in GLL format for EASE and EASE EVAC are available, offering planning support for demanding projects. Whether used as a primary or secondary speaker, the CM-8 delivers clear, reliable sound in a wide range of acoustic environments.

Features

• Coaxial 8-inch polypropylene woofer/midrange transducer with 1-inch aluminum dome tweeter
• High-quality sound reproduction with integrated waveguides and passive crossover
• Flexible installation with a front-accessible rotary switch for easy low-impedance (8 ohms) or high-impedance (100V/70V) operation
• Multiple power taps available in high-impedance mode for flexible system configuration
• Magnetic attachment of front grille, available in black or white to match decor
• Resonance-free steel back-can for enhanced sound clarity
• Flame-retardant ABS construction for fire safety (IEC 60695-11-10/-20 Class V-0/5VB)
• Four front-accessible mounting clamps and optional C-rings and tile bridges for secure installation
• Certified for use in electro-acoustic emergency warning systems (ENS) in accordance with EN 50849
• Simulation data available in GLL format for EASE and EASE EVAC for project planning
• Wide frequency range (73 Hz - 20 kHz) with a conical dispersion angle of 135° for broad coverage
• Maximum SPL of 115 dB peak for powerful sound output

Specifications

Characteristics

• Concept: Ceiling Mounted Speaker
• Cabinet Principle: Bass reflex
• Power Handling RMS: 70 W (Low-Z), 30 W max. (High-Z 100 V)
• Power Handling Program: 140 W (Low-Z)
• Power Handling Peak: 280 W (Low-Z)
• Power Handling 100 V (5 Taps): 30 W, 20 W, 10 W, 5 W
• Power Handling 70 V (5 Taps): 15 W, 10 W, 5 W, 2.5 W
• Nominal Impedance (Low-Z): 8 ohms
• Nominal Impedance (High-Z Power Taps): 300 ohms, 500 ohms, 1000 ohms, 2000 ohms
• Maximum SPL Average: 109 dB
• Maximum SPL Average (High-Z, 15 W Tap): 107 dB
• Maximum SPL Peak (Low-Z): 115 dB
• Maximum SPL Peak (High-Z, 15 W Tap): 112 dB
• Sensitivity 1W/1m (Low-Z): 90 dB
• Crossover Frequency: 2.2 kHz
• Frequency Range (-6 dB): 73 Hz - 20 kHz
• Frequency Range (-10 dB): 60 Hz - 20 kHz
• Dispersion Angle (-6 dB, Circular): 135°

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: 8-inch polypropylene speaker with ferrite magnet and 1.25-inch voice coil
• High Frequency: 1-inch aluminum dome tweeter with neodymium magnet and 1-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: 4 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): 12.32 x 7.09 (6.81) inches
• Cut-Out Diameter: 280 mm (Template Included)
• Weight: 11.79 lbs