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CMX DA-240 240W Class-D Power Amplifier
► 240W RMS Output: Delivers 240W continuous power for commercial 100V loudspeaker installations.
► 85% Class-D Efficiency: Digital switching circuitry minimizes heat and operating energy consumption.
► Dual Speaker Outputs: Supports 100V distributed lines and 8-Ohm low-impedance systems.
► Compact 1U Chassis: Slim 19-inch rack profile saves valuable equipment rack space.
► Dual AC & DC Power: 230V AC mains plus 24V DC emergency battery backup.
► Balanced Line Input: Euroblock Phoenix connector with rear rotary gain level control.
► Auto-Standby Mode: Automatically sleeps after 1 minute of silence and wakes instantly.
► Comprehensive Protection: Safeguards against short circuit, overload, high temperature, and clipping.
CMX DA-240 240W Class-D Power Amplifier
High-Efficiency 1U 19-Inch Rack-Mount Single-Channel Commercial Booster Amplifier with 100V & 8Ω Outputs, Switching Power Technology & 24V DC Emergency Backup
The CMX DA-240 is a high-performance 240W RMS digital Class-D power amplifier engineered for commercial public address (PA), voice evacuation (PAVA), and background music distribution. Utilizing advanced switch-mode power technology (SMPS) with over 85% electrical efficiency, it delivers heavy continuous audio output while generating minimal heat in a compact 1U 19-inch rack chassis. Equipped with dual 100V and 8-Ohm loudspeaker outputs, balanced Phoenix line input, auto-standby power saving, and 24V DC battery backup compatibility, the DA-240 provides rock-solid reliability for enterprise installations across India.
Ideal For
- ✓ Corporate Offices & Tech Parks
- ✓ Shopping Malls & Department Stores
- ✓ Hotels & Banquet Facilities
- ✓ Airports, Railway & Transit Hubs
- ✓ Educational Campuses & Auditoriums
- ✓ Hospitals & Healthcare Facilities
- ✓ PAVA Emergency Voice Evacuation
Core Engineering Features
240W RMS Continuous Class-D Output
Generates 240 watts continuous RMS power to drive large clusters of commercial ceiling speakers and outdoor wall-mount units.
85% High Electrical Efficiency
Digital SMPS switching circuitry dramatically cuts energy consumption and thermal dissipation, eliminating large internal cooling fans.
Dual 100V & 8Ω Loudspeaker Terminals
Supports both long-distance high-impedance 100V distributed lines and low-impedance 8-Ohm direct loads for foreground Hi-Fi setups.
Ultra-Slim 1U 19-Inch Rack Design
Only 44 mm in height, saving valuable rack space in dense AV equipment racks while keeping overall cabinet weight light (4.2 kg).
Dual AC 230V & DC 24V Power Operation
Includes DC 24V terminals for automatic emergency battery power failover, complying with international PAVA life-safety voice alarm standards.
Auto-Standby & Full Protection Suite
Enters sleep mode after 1 minute of signal silence and wakes instantaneously. Protected against short circuit, overload, high temp, and clipping.
Speaker Matching & System Compatibility
The CMX DA-240 delivers 240W RMS (192W continuous usable load with 80% safety headroom). Recommended loudspeaker configurations and front-end controllers:
Distributed Speech & BGM
Foreground Music & Outdoor
Multi-Zone Matrix Integration
100V Speaker Load & Tap Calculation Guide
80% Safety Headroom Rule: On 100V distributed systems, always budget the total connected speaker wattage to 80% of amplifier rating (192W max on the 240W DA-240) to accommodate cable impedance losses and dynamic audio peaks without clipping.
DA-240 Maximum Speaker Capacities (@ 100V Line):
- Parallel Daisy Chaining: Connect all 100V speakers in parallel (+ to 100V, – to COM). Total speaker load must not exceed 192W.
- DIP Switch High-Cut Filter: Toggle the rear DIP switch to engage the 70 Hz – 10 kHz filter to optimize speech intelligibility and prevent transformer low-frequency saturation.
- 24V DC Emergency Backup: Connect an external 24V battery power supply to ensure voice alarm broadcasts continue during AC power loss.
Technical Specifications
| Parameter | Details |
|---|---|
| Model | DA-240 (Series: DA-120, DA-240, DA-350, DA-500) |
| Brand | CMX Audio |
| Product Type | Digital Class-D Single-Channel Commercial Power Booster Amplifier |
| Rated Power Output | 240 Watts RMS continuous |
| Amplifier Topology | Class-D digital switching power with SMPS technology (>85% efficiency) |
| Speaker Outputs | 100V Constant Voltage Distributed Line & 8 Ohm Low Impedance |
| Audio Input | 1 × Balanced Line Input via Phoenix Euroblock connector with gain level control |
| Input Sensitivity & Impedance | 0.775V (0 dBu), 10 kΩ balanced |
| Frequency Response | L/H Cut OFF: 20 Hz – 20 kHz (+1/-2dB) | L/H Cut ON: 70 Hz – 10 kHz (+1/-3dB) |
| Total Harmonic Distortion (THD) | < 0.1% (1 kHz / -3 dBv, 100W) |
| Signal-to-Noise Ratio (S/N) | > 80 dB |
| Power Supply | 230V AC (50-60 Hz) & 24V DC battery backup terminals |
| Power Consumption | 300 Watts |
| Front Panel Indicators | LEDs for Protection (PROT), Clip (CLIP), Input (IN), and Output (OUT) |
| Protection Circuits | Short circuit, overload, high temperature, clip limiter, DC offset protection |
| Chassis & Dimensions | 19-Inch 1U Standard Rack Mount (484 mm W × 420 mm D × 44 mm H) |
| Net Weight | 4.2 kg |
Frequently Asked Questions
What is the primary function of the CMX DA-240 power amplifier?
The CMX DA-240 is a dedicated single-channel 240W RMS Class-D booster amplifier designed to power large clusters of 100V commercial loudspeakers or 8-Ohm low-impedance speakers. It receives balanced line audio from preamplifiers, matrix mixers, or DSP audio processors and boosts it for distribution across corporate floors, educational institutions, and public venues.
Why is Class-D switching technology beneficial in commercial PA installations?
Class-D switching technology achieves over 85% electrical efficiency compared to roughly 50% in traditional analog amplifiers. This minimizes electricity draw, generates very little internal heat, eliminates bulky cooling fans, and allows the DA-240 to fit into an ultra-slim 1U 19-inch rack chassis weighing just 4.2 kg.
How does the 24V DC emergency power backup operate?
The DA-240 features dedicated 24V DC screw terminals alongside standard 230V AC mains. In the event of a mains power interruption, the amplifier seamlessly transitions to 24V battery power, ensuring public address and emergency voice evacuation announcements remain online without interruption.
How many ceiling speakers can connect to the CMX DA-240?
Following the industry standard 80% safety headroom rule, the usable power is 192W. This allows connecting up to 32 ceiling speakers tapped at 6W, 64 speakers tapped at 3W, or 128 speakers tapped at 1.5W in parallel on a 100V line.
What does the auto-standby feature do?
If no audio input signal is detected for one minute, the amplifier automatically enters a low-power standby state to conserve energy. As soon as an audio signal is detected on the line input, the amplifier wakes up instantly without clipping the initial sound.
Need Commercial AV System Design or B2B Pricing in India?
ProjecXive is an authorized commercial AV partner in India. Contact our sound engineering team for enterprise project quotes, load calculation verification, and official warranty support.
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ProjecXive India –
The CMX DA-240 240W Class-D Power Amplifier is an outstanding choice for commercial and professional AV installations. It delivers reliable 240W continuous power, exceptional 85% thermal efficiency in a slim 1U rack profile, and seamless 24V DC battery failover. Verified and recommended by ProjecXive India for commercial public address and voice alarm systems.