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Small rectangular USB DAC with 3.5mm and 4.4mm headphone jacks, matte finish

Questyle Audio Technology Co.,Ltd

Questyle M15i Headphone Amplifier USB DAC 4.4mm 3.5mm

SKU CH-BMYJ-917WA

Portable USB DAC and headphone amplifier with ESS ES9281AC chip, patented CMA technology, 3.5 mm and 4.4 mm outputs, PCM 768 kHz and DSD512 support

  • Wireless TypeAdapter
  • ESS ES9281AC DAC decodes PCM 768kHz/32-bit and DSD512 natively
  • Patented CMA circuit delivers 0.0003% distortion and 1MHz bandwidth
  • Dual 3.5mm and 4.4mm outputs drive 8–600 ohm headphones
  • Manual gain switch matches sensitivity to any headphone
  • MFi certified with iOS, Android 5.1+, HarmonyOS and Windows 10+ support

Portable USB DAC and headphone amplifier

The Questyle M15i is a compact USB DAC and headphone amplifier designed for listeners who want high-resolution playback from smartphones, PCs or laptops. It connects via USB-C and provides both 3.5 mm single-ended and 4.4 mm fully balanced outputs. MFi certification ensures direct compatibility with iOS devices, while support extends to Android 5.1+, Harmony OS and Windows 10+.

Dual outputs and CMA engines drive 8–600 Ω loads

Four Current Mode Amplifier engines deliver up to 1 MHz bandwidth with distortion measured at 0.0003%, and the impedance range of 8 to 600 Ω covers most headphones on the market. The ESS ES9281AC DAC decodes PCM up to 768 kHz/32-bit and DSD512, so lossless files play at their native rates. Manual gain adjustment lets you match output level to sensitive or demanding headphones without digital attenuation.

Replaces basic dongles when balanced drive

The M15i upgrades from simple USB-C dongles that only offer a single-ended jack and limited sample-rate support. It is not for users who need a Lightning connector without the separate Questyle LTC02 adapter, nor for setups requiring wireless streaming or integrated microphone passthrough.

Highlights

  • ESS ES9281AC DAC decodes PCM 768kHz/32-bit and DSD512 natively
  • Patented CMA circuit delivers 0.0003% distortion and 1MHz bandwidth
  • Dual 3.5mm and 4.4mm outputs drive 8–600 ohm headphones
  • Manual gain switch matches sensitivity to any headphone
  • MFi certified with iOS, Android 5.1+, HarmonyOS and Windows 10+ support

Specifications

Wireless TypeAdapter

Questions about this item

Will the M15i drive my older 32-ohm headphones through the 3.5mm jack without distortion?

Yes, the CMA amplifier adapts from 8 to 600 ohms, so 32-ohm loads are well within range and distortion stays at 0.0003% on the single-ended output.

How can I verify the ES9281AC DAC is actually decoding DSD512 after I plug it in?

Play a DSD512 test file; the device supports native DSD512 decoding, so your player should show the format and the LED indicator will confirm the sample rate.

Does the box include a Lightning-to-USB-C cable for my iPhone, or do I need to buy the LTC02 adapter separately?

The LTC02 Lightning-to-Type-C adapter is not included; it must be purchased separately for MFi-certified connection to Lightning devices.

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