Questyle M15i Blues Blue Headphone Amplifier – MFi Certified USB DAC/AMP with 4.4mm & 3.5mm Outputs, PCM768kHz, DSD512

Elevate your listening with refined jazz and blues detail

Meet the Questyle M15i Blues, a compact headphone amplifier and USB DAC designed to reveal the warmth of midrange and the shimmer of high frequency harmonics. Built around an updated ES9281AC DAC, it handles PCM 768 kHz and DSD 512, delivering a wide soundstage and precise detail for your favorite tracks. You can enjoy a seamless blend of clarity and musical texture, whether you are at a desk or on the move. The dual outputs include a balanced 4.4 mm and a standard 3.5 mm, giving you flexible options for your headphones.

Designed for late night listening moments

The CMA architecture blends low distortion with broad bandwidth, letting saxophone lines travel in space, bass stay articulate without turning muddy, and vocal nuance remain intimate yet expansive. The device stays cool and energy efficient, so you can enjoy longer sessions without worrying about heat or battery drain. Its portable form factor makes high fidelity more approachable for daily use.

Key benefits at a glance

• High-resolution decoding up to PCM 768 kHz and DSD 512 with a live, expansive soundstage
• Jazz and blues tuned warmth in the mids with airy, shimmering highs
• Low power design suitable for portable use with phones, tablets, and laptops
• Broad compatibility with iOS, Harmony OS, Android 5.1+ and Windows 10+

What you get

• M15i USB DAC Headphone Amp unit
• USB-C to USB-C cable
• USB-C to USB-A adapter
• User manual
• Friendly customer support

Real-world use cases. When you are commuting, you can connect the M15i to a phone or laptop to drive high-impedance headphones with precision and clarity. In a quiet room, CMA's low distortion helps reveal micro-details in guitar picks, cymbal ambience, and vocal textures. The low heat design allows for longer listening without distraction, while maintaining solid audio fidelity.

Quality you can rely on

With MFi certification, iPhone and iPad users enjoy seamless iOS compatibility. The compact chassis provides a clean desk presence and travel-friendly portability that fits into a bag or briefcase.