Questyle M15i

• M15i boasts near-universal compatibility with any mobile device or computer
• 3.5mm and 4.4mm output with selectable gain, provides higher level of power for a wider range of headphones
• Can handle up to PCM768kHz/32bit and DSD512
• Optimizes power consumption to prevent premature phone battery drainage
• Ultra-low noise floor of -130dB for a pure background, and ultra-low distortion levels of 0.0003%

Supports high resolution sound
The M15i features the highly acclaimed ESS ES9281AC flagship DAC, which can handle up to PCM768kHz/32bit and DSD512. It’s almost inconceivable that something as small as the M15i can process and reproduce such demanding audio formats.


MFi certification
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 iOS and macOS ecosystem. It complies with the 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.

Dual headphone outputs
The M15i, equipped with four current mode amplification 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, making it suitable for a wide range of apps and devices.

Full Compatibility for True Lossless Enjoyment
During the development, Questyle Labs conducted extensive testing and targeted optimization of M15i's compatibility with mainstream smartphones and tablets. Developers managed to achieve high compatibility with iOS, HarmonyOS, Android versions 5.1, etc. As for PC, it supports Windows 10 version 18.3 and above (driver-free) as well as Mac OS systems. Hence, all Hi-Fi headphone users can enjoy lossless audio on streaming platforms anytime, anywhere.

Powerhouse Current-Mode Amplification
The M15i contains two groundbreaking "current mode" patented amplification SiP modules developed by Questyle Technology. Given that it operates in the current domain, the low impedance characteristics of the current-mode circuitry result in a bandwidth of up to 1MHz and distortion as low as 0.0003%, capturing details hidden in the soundtracks. As a result, the risk of overheating or interruptions during long listening sessions is extremely low thanks to the patented current mode amplification, TOREX‘s efficient power management system, as well as the M15i’s high-performance and low-power consumption.

Comparison to predecessor M15

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 Conversion

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

Outputs

• 3.5mm single-ended headphone jack
  • RL=300Ω,Po=11.97mW, Vout(Max)=1.895Vrms,THD+N=0.0003%
• 4.4mm balanced headphone jack
  • RL=300Ω, Po=22.60mW, Vout(Max)=2.624Vrms, THD+N=0.0003%
• Frequency Response: ±0.1dB(20Hz-20kHz); ±2dB(20Hz - 80kHz)

External

• Exterior Material: CNC Anodized Aluminum Alloy
• Color: Black
• Dimensions: 61.9L X 27.9W X 12D(mm)

What's In The Box

• M15i USB DAC Headphone Amp
• Type-C to Type-C cable
• Type-C to USB-A Converter
• User Manual & Warranty Card