Questyle M18i Portable Hi-Res DAC & Headphone Amplifier with Bluetooth

The Questyle M18i is a flagship-level portable DAC and headphone amplifier designed for audiophiles who want uncompromising sound quality in both wired and wireless listening. Combining dual ESS DAC chips, Questyle’s patented Current Mode Amplification, and advanced Bluetooth 5.4 connectivity, the M18i delivers exceptional clarity, speed, and musical realism from smartphones, tablets, laptops, and desktop systems.

With seamless switching between USB DAC mode and Bluetooth mode, the Questyle M18i offers true versatility, making it an ideal all-in-one solution for high-resolution audio at home or on the go. Whether driving premium IEMs or full-size headphones, the M18i provides clean power, ultra-low distortion, and a refined, immersive listening experience.

Key Features

• Dual ESS ES9219Q DAC Architecture
  Dual-mono DAC design improves channel separation, dynamic range, and overall sound fidelity for precise, high-resolution audio reproduction.
• Questyle Patented Current Mode Amplification
  Advanced current-mode amplifier topology delivers extremely low distortion, fast transient response, and a black background, revealing fine detail and natural timbre.
• USB DAC and Bluetooth Dual-Mode Operation
  Effortlessly switch between wired high-resolution USB audio and high-quality Bluetooth streaming for maximum flexibility.
• Bluetooth 5.4 with High-Resolution Codec Support
  Supports a wide range of modern Bluetooth codecs including AAC, SBC, aptX, aptX HD, aptX Adaptive, LDAC, and LE Audio for premium wireless sound quality.
• Balanced and Single-Ended Headphone Outputs
  Features both 4.4mm balanced and 3.5mm single-ended outputs to accommodate a wide range of headphones and in-ear monitors.
• Manual Gain Control
  High and Low gain settings allow precise matching with sensitive IEMs or higher-impedance headphones.
• OLED Display and Smart Controls
  Integrated OLED screen provides clear visibility of playback mode, volume, sampling rate, and battery status.
• Built-In Microphone for Calls
  High-quality onboard microphone with advanced noise reduction ensures clear voice calls and online meetings.
• Apple MFi Certified and Cross-Platform Compatible
  Designed for seamless use with iOS devices, while also offering plug-and-play compatibility with Android, Windows, and macOS.
• Premium CNC Aluminum Chassis
  Precision-machined aluminum alloy body delivers durability, excellent heat dissipation, and a sleek, modern aesthetic.

Technical Specifications

DAC Chipset
Dual ESS ES9219Q

Supported Audio Formats
PCM: Up to 32-bit / 384kHz
DSD: DSD64 / DSD128 / DSD256

Bluetooth Version
Bluetooth 5.4

Bluetooth Audio Codecs
SBC, AAC, aptX, aptX HD, aptX Adaptive, LDAC, LE Audio

Headphone Outputs
3.5mm single-ended
4.4mm balanced

Output Power
Approximately 28 mW @ 300Ω (balanced)

Frequency Response
20Hz – 20kHz (±0.1dB)
20Hz – 80kHz (±2dB)

Total Harmonic Distortion + Noise
0.0002%

Gain Settings
High / Low manual gain switch

Display
Integrated OLED screen

Microphone
Built-in high-quality microphone with noise reduction

Battery Capacity
500 mAh internal rechargeable battery

Connectivity
USB-C (audio and charging), Bluetooth wireless

Compatibility
iOS, Android, Windows, macOS

Chassis Material
CNC-machined anodized aluminum alloy

Dimensions
75 × 35 × 14.5 mm

Why Choose the Questyle M18i?

The Questyle M18i portable DAC and headphone amplifier delivers reference-grade audio performance in a compact, elegant design. With its combination of current-mode amplification, dual ESS DACs, balanced output, and high-resolution Bluetooth, the M18i is perfectly suited for audiophiles who want premium sound quality without compromise — whether listening wired or wireless.