Questyle M15i is a compact USB DAC and headphone amplifier designed to upgrade wired listening from phones, tablets and computers.

Questyle Current Mode amplification, high-resolution decoding and 3.5mm single-ended and 4.4mm balanced provide a focused portable HiFi solution without an internal battery.

Why it stands out

Four core reasons to choose this Questyle model.

Current Mode Amplification

Questyle's patented amplification architecture is designed for wide bandwidth, fast transient response and low distortion.

High-Resolution USB Decoding

ESS ES9281AC supports high-resolution playback from compatible USB sources.

Practical Headphone Connectivity

3.5mm single-ended and 4.4mm balanced cover the intended wired headphone and IEM connections.

Portable, Bus-Powered Design

The compact unit draws power from the connected source and requires no separate charging routine.

Best for

• Portable wired headphone listening
• USB-C phone and tablet audio
• Laptop and desktop headphone systems
• High-resolution local or streaming playback

Not ideal for

• Wireless Bluetooth headphone users
• Users needing speaker power amplification
• Headsets requiring microphone pass-through
• Listeners needing an internal battery

EMiUZEK Buying Notes

• Questyle M15i is a USB DAC/headphone amplifier, not a music player or speaker amplifier.
• USB cable compatibility depends on the source device; iPhone connection requirements vary by connector generation.
• Start with low gain and low volume when using sensitive IEMs.

Frequently Asked Questions

Can it drive passive speakers?

No. It is designed for wired headphones and IEMs.

Does it support Bluetooth?

No. Audio input is through USB.

Does it need charging?

No internal battery is used; it is powered by the connected source.

Can I use it with an iPhone?

Yes with the appropriate compatible cable; MFi support applies where specified for the model.

Does it support headset microphones?

The headphone outputs are for audio playback and do not provide microphone pass-through.

Can it work with a computer?

Yes, through a compatible USB connection and operating-system audio output selection.

HOW TO CONNECT

USB-C phone

Source: Phone / tablet
Connection: USB-C
Output: Headphone output
Target: Wired IEMs or headphones
Note: Select the Questyle device as audio output if needed.

Computer audio

Source: PC / Mac
Connection: USB
Output: Headphone output
Target: Wired headphones
Note: Use a compatible data cable, not a charge-only cable.

Portable streamer

Source: USB-capable digital player
Connection: USB
Output: Headphone output
Target: Wired IEMs
Note: Begin playback at low volume.

Technical Specifications

Recommended System Setup

Additional Product Content