M12i · Mobile Headphone Amplifier with DAC

Enjoy an immersive Hi-Fi experience on your mobile phone

Paired with any HiFi headphone, the M12i allows users to enjoy True Lossless audio content from streaming platforms, ensuring the best audio experience.

M12i · Mobile Headphone Amplifier with DAC

With its patented Current Mode Amplifier technology, the M12i's noise floor is below -130dB, ensuring no perceptible noise when paired with high-sensitivity earphones. The M12i has an extremely wide frequency response of over 80kHz, making it a true Hi-Res device.

Enjoy an immersive Hi-Fi experience on your mobile phone

Following the success of the first-generation M12, which sold out tens of thousands of units, the improved M12i overcomes the performance, cost, and size limitations of phone-specific integrated audio circuits. With Questyle's unique Current Mode Amplification combined with the ESS flagship USB DAC chip, the M12i allows users to enjoy true lossless audio content from streaming platforms with any HiFi headphone, ensuring the best audio experience.

Apple MFi Certified for Guaranteed Performance and Compatibility

The "i" in M12i indicates that it has been certified for the Apple MFi standard. 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, especially in terms of power consumption, to avoid the risk of damage to phones and connected systems from arbitrary USB device pairings.

Full Compatibility for True Lossless Enjoyment

During development, Questyle Labs conducted extensive testing and optimization of the M12i's compatibility with mainstream smartphones and tablets. High compatibility is ensured with iOS, HarmonyOS, and Android versions 5.1 and above. As for computer systems, it supports Windows 10 (version 18.3) and above w/o driver, and Mac OS. As a result, Hi-Fi headphone users can enjoy true lossless audio content from streaming platforms anytime and anywhere.

SiP Current Mode Patent Independent Headphone Amplifier, Low Power Consumption

The M12i is not constrained by the power limitations of op-amp (operational amplifier) chips used in competing products, thanks to the independently developed Current Mode Amplification module.The M12i has ultra-low distortion of 0.0003% and extremely high current output capacity.

Due to Questyle's patented Current Mode Amplification and TOREX‘s efficient power management system, the M12i features high performance with low power consumption. This greatly lowers the risks of overheating and signal interruption during extended use.

Hardcore Technological Aesthetics

The high-impact Kunlun glass window reveals the exquisite craftsmanship of the PCB, presenting the critical signal-processing components and the hardcore tech aesthetic.

Specification

Compatible Operating Systems
  • Android phones and tablets: Supports devices with Android 5.0 and above
  • PC system: Supports devices with Windows 10 version 18.3 and above
  • Apple phones: Supports iOS system (When connecting to Lightning interface devices, the Questyle LTC02 Lightning to Type-C adapter needs to be purchased separately.)
  • Apple computers: Supports Mac OS system
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=16Ω,Po=19mW;

RL=32Ω,Po=21mW;

RL=300Ω,Po=12.26mW;

When M12i detects an impedance less than 70Ω, it automatically sets to low-gain output;When greater than 70Ω, it automatically sets to high-gain output, and for 600Ω 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
Design
  • Exterior Material: CNC Anodized Black Aluminum Alloy
  • Color:Black
  • Dimensions: 56.9[L] X 20.2[W] X 9.5[D] mm
Accessories
  • M12i · Mobile Headphone Amplifier with DAC
  • Type-C to Type-C Cable
  • Type-C to USB-A Cable
  • Warranty Card &User Manual