Questyle M15i Mobile Headphone Amplifier with DAC

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Questyle M15i Mobile Headphone Amplifier with DAC

The M15i contains two groundbreaking "current mode" patented amplification SiP modules developed by Questyle Technology. Overall, it totals four current mode amplification engines, delivering powerful and clear sound. Given that it operates in the current domain, the low impedance characteristics of the current-mode circuit result in a bandwidth of up to 1MHz and distortion as low as 0.0003%, capturing hidden details in songs.

As a result, the risk of overheating or interruptions during long listening sessions is extremely low thanks to the patented current mode amplification (TOREX precision power management technology) as well as the M15i's high performance and low power consumption.



Full Compatibility for True Lossless Enjoyment

During development, Questyle Labs conducted extensive testing and targeted optimization for M15i's compatibility with mainstream smartphones and tablets. Developers managed to achieve high compatibility with iOS, HarmonyOS, and Android versions 5.1 and above. As for PC, it supports Windows 10 18.3 and above (driver-free) as well as macOS. Hence, all HiFi headphone users can enjoy lossless audio on streaming platforms anytime, anywhere.



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.



3.5MM and 4.4MM DUAL Ports with Gain Adjustment

The M15i, 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, rendering the M15i suitable for a wide range of apps and devices.


Questyle M15i front quarter diagram highlighting manual gain switch


In the box
IN THE BOXM15i Mobile Headphone Amplifier with DAC, USB Type-C to Type-C Cable, USB Type-C to Type-A Cable, Warranty Card, User Manual
DACESS flagship USB DAC chip ES9281AC
Frequency Response±0.1dB (20Hz-20kHz) | ±2dB (20Hz-80kHz)
Output Power
4.4mmRL=300Ω | Po=22.6mW, Vout (Max)=2.624Vrms
3.5mmRL=300Ω | Po=11.97mW, Vout (Max)=1.895Vrms
DSDDSD64 (1Bit 2.8MHz), DSD128 (1Bit 5.6MHz), DSD256 (1Bit 11.2MHz), DSD512 (1Bit 22.4MHz)
PCMPCM: 44.1kHz – 768kHz (16/24/32Bit)
Apple computerMac OS
Apple cellphoneiOS (You need to buy an OTG cable for Lightning to USB-C)
PCWin10 1803 and above
Android phones and tabletsAndroid 5.0 and above
Size61.9mm x 27.9mm x 12mm
MaterialCNC machined aluminum

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