Anthem MDX8

The Anthem MDX8 is an 8-channel multi-zone amplifier, configurable for up to 4 zones. It features ARC Genesis room correction, applied independently to each zone. Developed over two years at the Ottawa research center, it delivers 60 watts per channel into 8 ohms, and up to 200 watts in bridged mode. The device uses Ultra-Class-D amplification technology designed to optimize energy efficiency.

Technical Design Focused on Versatility and Reliability

The MDX8 sports a 2U rack chassis (9.9 cm high) that conceals a sophisticated electronic architecture. At the heart of the device, Anthem’s Ultra-Class-D amplification technology offers all the advantages of modern Class D—high efficiency, low heat output, compactness—while avoiding the traditional pitfalls of this topology. This proprietary implementation allows for effortless handling of low-impedance loads and maintains a linear frequency response from 10 Hz to 20 kHz (±0.5 dB).

Advanced Load Monitoring (ALM) is the other technological pillar of the MDX8. This continuous monitoring system analyzes voltage, current, frequency, and impedance on each channel in real time. This proprietary technology ensures stable performance even with the most demanding loads, protecting the amplifier and speakers from overloads while optimizing power distribution according to the real needs of each zone.

The built-in 24-bit/192 kHz digital-to-analog converter preserves the integrity of high-resolution sources, while the audio switching matrix allows any analog or digital input to be assigned to any output. This total flexibility can be configured via the web interface or switched in real time by IP commands.

ARC Genesis: Zone-by-Zone Room Correction

The integration of ARC Genesis is arguably the most significant innovation of the MDX8. Developed in collaboration with the National Research Council of Canada, this third-generation room correction system analyzes and optimizes the response of each zone independently. Unlike traditional distribution systems that apply uniform processing, ARC Genesis measures the specific acoustic characteristics of each room and generates custom correction curves.

The calibration process is carried out using a calibrated measurement microphone and the ARC Genesis software (compatible with Mac and PC). Users can enable or disable correction for each zone, adjust target curves, and even create multiple profiles for different listening conditions. The proprietary algorithms preserve the room’s favorable acoustic characteristics while eliminating problematic resonances and modes, especially in the bass range where acoustic issues are most pronounced.

Subwoofer Management and Configuration Flexibility

The MDX8 stands out for its advanced subwoofer management, offering each zone a dedicated RCA output and the option to use an amplified channel in bridged mode to drive a passive subwoofer. This approach allows for optimal integration of low frequencies with independent settings per zone: crossover frequency, level, phase, and polarity.

Bridged configuration deserves special attention. By combining two channels, users can achieve up to 200 watts into 8 ohms to power more demanding speakers or passive subwoofers. This flexibility allows power distribution to be tailored to the specific needs of each installation, whether powering in-wall speakers in a living room, robust outdoor speakers, or subwoofers in a dedicated room.

Removable Phoenix connectors accept cables up to 12 AWG, making connections easy for the long distances typical of multi-zone installations. Analog pass-through connections allow multiple MDX units to be daisy-chained for larger systems.

Web Control Interface and Home Automation Integration

The MDX8’s adaptive web interface works on any device with a browser, from smartphones to desktop PCs. This modern approach eliminates the need for proprietary software and allows intuitive configuration of all settings. Each zone can be given a custom name, multiple input assignments, and independent tone controls (bass and treble ±6 dB, balance ±10 dB).

Compatibility with major home automation systems (Control4, Crestron, Savant, Elan, URC, RTI) is based on robust IP connections via the RJ-45 Ethernet port and RS-232. Drivers are easily downloadable, enabling seamless integration into existing installations. The amplifier can be powered on/off via IP/RS-232 commands, 12V trigger, or audio signal detection, offering maximum flexibility according to the installer’s preferences.

Technical Specifications

Power and Performance

• 8 configurable channels up to 4 zones
• Output power per channel:
  • 60 W RMS at 8 Ω
  • 120 W RMS at 4 Ω
  • 200 W RMS in bridged mode at 8 Ω

Audio Specifications

• Frequency response: 10 Hz - 20 kHz ± 0.5 dB
• Digital-to-analog converter (PCM) up to 24-bit, 192 kHz
• Advanced load monitoring
• Anthem Room Correction (ARC)

Controls and Adjustments

• Adjustments via Web interface:
  • Bass level: ± 6 dB per zone
  • Treble level: ± 6 dB per zone
  • Balance: ± 10 dB per zone
• Rear panel controls:
  • Power mode: automatic, trigger
  • External control
  • Network reset
  • Factory reset
  • Main switch

Connectivity

• Inputs:
  • 4 pairs of analog RCA
  • 1 digital optical input (S/PDIF)
  • Ethernet port (RJ-45)
  • Trigger input on 3.5 mm mini-jack (5-24 V DC/AC)
  • Micro-USB port for ARC
  • Serial port (RS-232)
• Outputs:
  • 4 pairs of speaker binding posts
  • 4 RCA subwoofer outputs
  • 12 V trigger output on 3.5 mm mini-jack
• Audio input-output matrix

Physical Characteristics

• Dimensions (H × W × D, with feet): 9.9 × 43.2 × 43.2 cm
• Weight: 9.5 kg
• Rack height: 2 units (without feet)
• Rack mounting brackets and feet included
• Power supply: 120 V ~ 50/60 Hz