Introducing the Questyle M18i Portable DAC and Amplifier

One of the standout features is its seamless integration with Apple devices, thanks to Apple MFi certification. For iPhone and iPad users, this means plug-and-play compatibility without any hiccups. But the M18i doesn't stop there; it also boasts Bluetooth 5.4 connectivity with support for high-resolution codecs like LDAC, aptX Adaptive, aptX HD, and the new LE Audio standard. Powered by Qualcomm Snapdragon Sound and Sony LDAC technologies, wireless audio transmission maintains exceptional quality, even over Bluetooth.

For headphone enthusiasts, the M18i offers both a 3.5mm single-ended output and a 4.4mm balanced output. Whether you're using your trusty everyday headphones or a pair of high-end IEMs, the M18i has you covered. The manual gain control allows for precise volume adjustments, accommodating various headphones and listening preferences.

Under the hood, the M18i employs a dual-module amplification system operating in a "current feedback" mode, achieving an impressively low distortion rate of just 0.0002%. This setup ensures a clean and transparent sound reproduction, with a noise floor lower than -130dB. The dual ESS ES9219Q DAC chips handle the digital-to-analog conversion with finesse, while the 16-core XMOS XU316 platform ensures broad compatibility across Windows, macOS, Android, and HarmonyOS devices, all without the need for additional drivers.

In terms of usability, the inclusion of an Infineon microphone with Qualcomm ClearVoiceCapture technology means voice calls are clear, reducing background noise effectively. The M18i’s built-in rechargeable 500mAh battery provides around four hours of playback, so it won't drain your phone's battery during extended listening sessions.

Here are the key specifications:

• Output Interfaces: 3.5mm single-ended, 4.4mm balanced
• Output Power: 28 mW @ 300Ω (4.4mm balanced)
• Frequency Response: ±0.1 dB (20Hz–20kHz); ±2 dB (20Hz–80kHz)
• Distortion (THD+N): 0.0002%
• DAC Chips: Dual ESS ES9219Q
• Body Material: CNC-machined anodized aluminum
• Dimensions: 75 × 35 × 14.5 mm
• Color: Tech Black
• Compatibility: Android 5.0+, Windows 10.1.8.3+, macOS, iOS (requires LTC02 adapter for Lightning)
• Bluetooth Version: 5.4
• Supported Codecs: AAC, SBC, aptX, aptX HD, aptX Adaptive, LDAC, LE Audio
• Microphone: Infineon with Qualcomm ClearVoiceCapture
• Battery: 500 mAh

At a price point of $350, the Questyle M18i positions itself as a versatile and high-quality solution for mobile audiophiles. It's not just about amplification; it's about delivering studio-quality sound wherever you go. For those who have been waiting for a portable DAC/amp that doesn't compromise on features or sound quality, the M18i might just be the answer.