Questyle M18i | Bluetooth Portable DAC and Amp

M18i Pushes the Limit of Ultra-Portable DAC Dongles with Both Bluetooth Capability and Lossless Decoding Dual flagship ES9219Q DACs Equipped with Bluetooth 5.4 3.5mm and 4.4mm outputs for versatile headphone compatibility Ultra-low noise floor of -130dB for a pure background and real sound Supports up to 384kHz (16/24/32-bit) PCM, delivering rich, high-fidelity audio Leather protective case available Technology Without Boundaries The M18i contains four sets of SiP modules that use Questyle’s patented Current Mode Amplification, providing both powerful drive and delicate timbre. The M18i also features ESS’s flagship ES9219Q Combo DAC, a dual- DAC mono design, and a TTA (Three-Tier Architecture) DAC framework. Together, these provide performance equivalent to large desktop devices, while raising the bar for portable sound quality. The Questyle M18i features wired USB and dual-mode lossless Bluetooth connectivity, powered by a 16-core XMOS316 USB platform for seamless compatibility with smartphones, PCs, and gaming consoles. As the first M-series product with Qualcomm Snapdragon Sound, the M18i also introduces intelligent battery management, a high-definition OLED screen, and a microphone for clear voice calls. Offering exceptional Hi-Fi audio via Bluetooth or USB, the M18i delivers a premium listening experience. Apple MFi Certified for Guaranteed Performance and Compatbility The "i" in M15i indicates that it has been certified by Apple's MFi. MFi certification ensures perfect support for iPhone/iPad and seamless integration into the Apple ecosystem. It complies with Apple's stringent requirements for external devices in terms of power consumption and compatibility, avoiding the risk of damage to phones and systems from arbitrary device pairings. Patented SiP Current Mode Amplifier The Questyle M18i prioritizes resolving trade-offs between size, power efficiency, and audio performance in portable, battery-powered devices. It features two patented quad-core Current Mode Amplifier (CMA) SiP modules, delivering powerful drive with delicate timbre and achieving ultra-low distortion of 0.0002%. By combining CMA technology with TOREX’s high-efficiency power management, the M18i ensures low power consumption without compromising performance, setting a new benchmark for the Questyle M series. Sound Quality A low noise floor is essential for capturing the intricate details of an audio track, allowing you to experience true high fidelity. The M18i excels in this regard, delivering exceptional accuracy with an ultra-low noise floor of -130dB, as verified in a controlled laboratory testing environment. Full Compatibility for True Lossless Enjoyment The M18i supports lossless Bluetooth and USB DAC dual-mode switching, making it convenient for users to choose freely. It is equipped with the latest generation of Qualcomm Snapdragon Sound technology and Bluetooth 5.4. 3.5mm and 4.4mm Dual Ports with Gain Adjustment The M18i, equipped with (x4) current mode engines, supports 3.5mm single-ended and 4.4mm fully balanced output modes. It also features manual gain adjustment, allowing users to choose the gain mode according to personal preferences, headphone characteristics, or the audio system. Management System Mobile Mode In Mobile Mode, the USB audio port is used exclusively for data transmission and does not draw power from the connected mobile device. The M18i operates entirely on its internal battery. Similarly, in Bluetooth Mode, the device relies solely on its battery for power, ensuring no external power source is required. PC Mode In PC Mode, the USB audio port serves a dual purpose: transmitting data and supplying power. It charges the M18i’s battery while simultaneously powering the system. When connected to a USB host device with a current limit, the M18i intelligently manages power distribution. It prioritizes the system’s operation by ensuring stable performance, then dynamically adjusts the battery charging current based on the system’s workload and power availability. This ensures optimal performance without overloading the USB host. Specifications Appearance Material: CNC Anodized Aluminum Alloy Color: Black Size: 75mm x 35mm x 14.5mm Bluetooth Version 5.4 Supports: AAC, SBC, aptX, aptXHD, aptX adaptive, LDAC, LE Audio Compatible Operating Systems Android phones and tablets: Android 5.0 and above PC: Win10 1803 and above Apple cellphone: iOS (You need to buy an OTG cable for Lightning to USB-C) Apple computer: Mac OS DAC Capability PCM: PCM: 44.1kHz-384kHz (16/24/32bit) DSD: DSD64, DSD128, DSD256 Output Power 4.4mm: 28mW @ 300 ohms Frequency Response & THD Frequency Response: ±0.1dB (20Hz-20kHz); ±2dB (20Hz-80kHz) THD+N: 0.0002% DAC: (2x) ESS ES9219Q In the Box M18i Mobile Headphone Amplifier with DAC USB Type-C to Type-C Cable USB Type-C to Type-A Cable Warranty Card User Manual