Questyle CMA EIGHTEEN MASTER

The Questyle CMA EIGHTEEN MASTER is a cutting-edge high-fidelity headphone preamplifier that embodies sonic excellence and versatility. This device combines Questyle’s latest technological innovations to deliver an unparalleled listening experience.

A Concentration of Technology Dedicated to Audio

The CMA EIGHTEEN MASTER features Questyle’s patented Current Mode Amplification (CMA) technology. This unique approach achieves extremely low harmonic distortion, complete operational silence, and an extended frequency response. The amplification circuit uses a fully discrete structure, with separate preamplification and headphone amplification stages to ensure optimal performance.

At the heart of the device lies the ES9039PRO DAC chip, a 32-bit, 8-channel converter with Hyperstream IV architecture. Paired with the XMOS XU-316 USB interface, it can decode PCM files up to 32-bit/768 kHz and native DSD up to DSD512. This state-of-the-art configuration ensures exceptionally precise digital-to-analog conversion.

Comprehensive Connectivity for All Uses

The CMA EIGHTEEN MASTER is not just an excellent headphone amplifier; it also offers remarkable versatility. Its multiple digital inputs (USB-B, USB-C, optical, coaxial) and analog inputs (RCA) allow it to connect to a wide variety of sources.

On the output side, there are three headphone options: a 6.35 mm unbalanced jack, a 4-pin XLR balanced output, and a 4.4 mm balanced Pentaconn output. The latter, increasingly popular, provides a compact and practical alternative to the traditional 4-pin XLR.

For use as a preamplifier, the CMA EIGHTEEN MASTER features RCA and XLR line outputs. A switch allows you to toggle between fixed and variable output levels, offering maximum flexibility to adapt to different setups.

High-Definition Wireless at Your Fingertips

Questyle has embraced the wireless trend by integrating next-generation Bluetooth connectivity. The CMA EIGHTEEN MASTER supports the most advanced high-definition codecs: SBC, AAC, aptX, aptX HD, and LDAC. This feature allows you to enjoy exceptional sound quality even when streaming from a smartphone or tablet.

A Refined Design Combining Aesthetics and Functionality

The CMA EIGHTEEN MASTER boasts an elegant and minimalist design that fits seamlessly into any audiophile environment. Its 10 mm thick aerospace-grade aluminum front panel gives it a premium and robust appearance. The controls are thoughtfully arranged for intuitive use.

The ALPS analog volume potentiometer, renowned for its quality, provides precise and smooth sound level control. The various selectors (source, gain, DAC/amp mode) are easily accessible on the front panel, except for the gain switch located underneath the device.

Meticulous Power Supply for Optimal Performance

Questyle has paid special attention to the power supply of the CMA EIGHTEEN MASTER, a crucial element for achieving the best audio performance. The device uses a high-quality NORATEL toroidal transformer, combined with a Schottky rectifier to deliver perfectly clean power to the analog section of the DAC.

The power supply circuits for the digital section and the amplification/conversion section are independent, ensuring optimized signal processing. This meticulous design helps reduce noise and distortion, resulting in exceptionally pure sound reproduction.

A Major Evolution Over the CMA Fifteen

The CMA EIGHTEEN MASTER represents a significant evolution over its predecessor, the CMA Fifteen. Notable improvements include:

• The adoption of the new XMOS XU-316 USB interface, offering better compatibility and enhanced performance.
• The addition of a USB-C port alongside the traditional USB-B, for more modern connectivity.
• An updated Bluetooth module, now featuring the LDAC codec for superior wireless quality.
• The use of a military-grade PCB with reduced dielectric constant, lowering harmonic distortion by 30% compared to the CMA Fifteen.

These subtle improvements make the CMA EIGHTEEN MASTER an even more powerful and versatile device than its predecessor.

Technical Specifications

General Architecture

• High-fidelity desktop headphone amplifier and digital-to-analog converter (DAC)
• Symmetrical preamplification and amplification circuits, ALPS analog potentiometer
• Proprietary Current Mode Amplification (CMA)
• USB Interface: XMOS XU-316
• Gold-plated motherboard (30% reduction in harmonic distortion)

Connectivity

• Headphone outputs: 6.35 mm unbalanced, 4.4 mm balanced, XLR4 balanced
• Digital inputs: USB Type-C, USB Type-B, optical, coaxial
• Analog input: RCA
• Preamplifier outputs: XLR, RCA

Audio Specifications

Converter and Supported Formats

• Converter: SABRE ESS9039Pro 32-bit, 8-channel
• Maximum resolution: PCM 768 kHz / 32-bit, DSD512
• Bluetooth codecs: SBC, AAC, aptX, aptX-HD, LDAC

Performance

• Unbalanced output power:
  • 188 mW at 300 Ω
  • 1.5 W at 32 Ω
• Balanced output power:
  • 765 mW at 300 Ω
  • 2 W at 32 Ω
• Total Harmonic Distortion plus Noise (THD+N):
  • < 0.0003% at 300 Ω
  • < 0.001% at 32 Ω
• Signal-to-noise ratio:
  • Unbalanced: > 117 dB
  • Balanced: > 120 dB

Compatibility

• Streaming services: Qobuz, Tidal, Spotify, Apple Music
• Headphones: Optimized for high-end dynamic and planar models

Physical Characteristics

• Dimensions: 330 × 200 × 55 mm (W × D × H)
• Weight: 3.5 kg

Included Accessories

• Questyle CMA Eighteen Master
• USB-C to USB-C cable
• Remote control
• Power cable