Hardcore Technological Aesthetics

The design of the Kunlun glass window, coupled with the exquisite craftsmanship of the PCB, presents the critical elements of signal processing and hardcore technological aesthetics.

Apple MFI Certified for Guaranteed Performance and Compatibility

The "i" in M12i indicates that it has been certified by Apple 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 USB device pairings.

M12i Mobile Headphone Amplifier with DAC, Enjoy all the benefits of M12i

At the 2024 CES exhibition, Questyle unveiled the second-generation Mobile Headphone Amplifier with DAC M12i.
Following the success of the first-generation M12, which has been sold out in tens of thousands of units, the M12i also features high-performance audio signal processing. It breaks through the limitations of integrated audio circuits in phones in terms of technology, cost, and size. With Questyle's unique Current Mode Amplification paired with the ESS flagship USB DAC chip, it allows users to fully enjoy lossless audio content from streaming platforms with traditional HiFi headphones, ensuring the best audio experience.

SiP Current Mode Patent Independent Headphone Amplifier, Low Power Consumption, and Strong Driving Force Works for Extended Periods at High Volume

Questyle 's exclusive patented "Current Mode" amplifier technology is the fundamental hardware that sets Questyle apart from other terminals. As the "engine" of the headphone system, the amplifier has a crucial impact on sound quality. Thanks to the independently developed Current Mode amplification module, unlike similar products that use operational amplifier (op-amp) chips for amplification, the M12i is not constrained by the power limitations of op-amp chips. It has ultra-low distortion of 0.0003% and extremely high current output capability. Thanks to the patented Current Mode amplification and the use of TOREX 's efficient power management system, it features high performance and low-power consumption. Hence, it lowers the risks of overheating or interruptions in case of a long use.

• Ultra-Low Distortion: 0.0003%
• Smart Impedance Matching: 8Ω-600Ω

Full Compatibility for True Lossless Enjoyment

During development, Questyle Labs conducted extensive testing and targeted optimization for M12i's compatibility with mainstream smartphones and tablets. It managed to achieve high compatibility with iOS, HarmonyOS, and Android versions 5.1 and above. As for PC apps, it supports Windows 10 version 18.3 and above (driver-free) and Mac OS. As a result, Hi-Fi headphone users can fully enjoy lossless audio content from streaming platforms anytime, anywhere.

-130dB Ultra-Low Noise Floor, Pure Background

Thanks to the patented Current Mode amplifier technology, M12i's noise floor is below -130dB, ensuring no noise when listening to music with high-sensitivity earphones.
M12i has an extremely wide frequency response of over 80kHz, making it a true Hi-Res device.

Smart Impedance Matching; Unlocking the Full Potential of Headphones

When headphones are plugged into the M12i, the built-in smart impedance detection system automatically identifies the headphone impedance and adapts accordingly, much like an automatic transmission in a car. Upon detecting the insertion of headphones, M12i instantly activates the working mode, recognizing and configuring the corresponding gain for the connected headphones. When the gain light is illuminated, a single indicator represents low gain, suitable for low-impedance headphones, avoiding overdriving. Dual red indicators represent high gain, providing sufficient drive for high-impedance headphones. If M12i is connected as a mobile DAC to Hi-Fi systems, active speakers, etc., it will automatically switch to high-level output, providing sufficient support for Hi-Fi audio systems.

Gain Indicator Light

• H high gain (dual lights)
• L low gain (single lamp)

When playing music, the data status indicator will light up

• A single red indicator means PCM data with a sampling rate not exceeding 48kHz.
• Dual red indicators represent high-sampling-rate PCM data or DSD audio data.

Driver-Free Design, Enjoy High-Fidelity Pleasure in a Minimalistic Manner

• Connect to PC
• Connect to iPad

Technology Knows No Boundaries, ESS Flagship USB DAC Jointly Developed

Questyle and ESS's research and development teams in the United States, China, and Canada maintain fruitful and long-term collaboration to exceed customer expectations while working on dongle DAC. The M12i features the updated ESS flagship USB DAC chip, ES9281AC, supporting a maximum of PCM768 and DSD512 D/A converting capability (the M12 supports a maximum of PCM384 and DSD256). Audio distortion performance and output power have been upgraded relative to the previous generation.

IN THE BOX

• M12i
• Type-C to Type-C Cable
• Type-C to USB-A Cable
• Warranty Card
• User Manual

SPECIFICATIONS

Compatible Operating Systems

• Android Phones and Tablets: Supports devices running Android 5.0 and above
• PC Systems: Compatible with devices running Windows 10 version 1803 and above Apple Phones: Supports iOS systems
• (Requires additional purchase of the Questyle LTC02 Lightning to Type-C adapter when connecting to devices with a Lightning interface.)
• Apple Computers: Compatible with macOS systems

D/A converting Capability

• PCM: 44.1kHz - 768kHz (16/24/32Bit)
• DSD: DSD64(1Bit 2.8MHz), DSD128(1Bit 5.6MHz), DSD256(1Bit 11.2MHz) DSD512(1Bit 22.4MHz)

Output Power

• Built-in smart impedance detection circuit
• RL=160, Po=19mW;
• RL=320, Po=21mW;
• RL=3000, Po=12.26mW;
• When M12i detects an impedance less than 700, it automatically sets to low-gain output; When greater than 700, it automatically sets to high-gain output, and for 6000 and above, it automatically switches to 2Vrms line output.
• Frequency Response: ±0.1dB(20Hz-20kHz); ±2dB(20Hz - 80kHz);
• THD + N: 0.0003%
• DAC: ESS Flagship USB DAC ES9281AC
• Exterior Material: CNC Anodized Black Aluminum Alloy
• Dimensions: 56.9[L] X 20.2[W] X 9.5[D] (mm)