Questyle SIGMA Pro

Questyle SIGMA Pro Portable Bluetooth DAC with Headphone Amplifier

The SIGMA Pro’s fully discrete, balanced current-mode amplifier delivers higher output power and current. It drives high-impedance headphones dynamically while precisely handling low-impedance IEMs with clarity. Four sets of these patented amps balance size, power, and performance.

Fully Balanced Design

Up to PCM768kHz & DSD512

Apple MFi Certified

Dual certified by LDAC

Headphone Jacks

4300mAh Battery

Color: Silver

$899.00

$999.00

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3Years - Warranty

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Questyle SIGMA Pro

$899.00

$999.00

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Questyle SIGMA Pro

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Patented Current Mode Amp + TTA Architecture

The SIGMA Pro’s fully discrete, balanced current-mode amplifier delivers higher output power and current. It drives high-impedance headphones dynamically while precisely handling low-impedance IEMs with clarity. Four sets of these patented amps balance size, power, and performance.

ESS Flagship DAC & Advanced Decoding

Dual ES9069 flagship stereo DACs in dual-mono config, paired with Questyle’s TTA three-tier decoding, deliver desktop-grade sound. Ultra-low loaded distortion and exceptional noise-floor control create a “black background,” placing you in a world-class studio.

ESS Flagship Stereo DAC

ES9069 Dual Mono Configuration

Ultra-Low Distortion & Pure Black Background

The SIGMA Pro delivers detailed and pure sound with loaded distortion so low it's almost imperceptible, and noise floor control that is astonishing, creating a "pure black background" for music, making you feel like in a top recording studio

Certified Wireless: Snapdragon Sound & LDAC

Fully certified by Qualcomm Snapdragon Sound (BT 5.4) and Sony LDAC, the SIGMA Pro supports aptX Adaptive/HD to stream lossless CD-quality up to 24-bit/96kHz hi-res audio - wired-grade sound over Bluetooth.

Bluetooth 5.4

Apple MFi Certified , iPhoneCompatibility Guaranteed

SIGMA Pro is officially Apple MFi-certified. MFi certification ensures seamless support for iPhone/iPad and the wider Apple ecosystem, meeting Apple' s strict requirements for power consumption and accessory compatibility, while preventing potential damage or instability caused by uncertified USB accessories.

Comprehensive Compatibility with Phones and PCs

SIGMA Pro supports connections to phones, tablets, andcomputers, featuring ultra-fast USB-C (UAC 2.0, driver-free)and lossless Bluetooth (LDAC/aptX Adaptive). It ofers flexible output mode switching: it can act as a headphone amplifier to drive premium Hi-Fi headphones, or use fixed-level line-out to connect to professional monitoring equipment or Hi-Fi desktop rigs—ideal as a professionalon-stage PC sound upgrade for live shows.

Questyle App

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Excellent product design

Deeply loved by enthusiasts

3.5mm & 4.4mm & 6.35mm Three Headphone Outputs + Manual Gain Easily Switch Your Exclusive Listening Mode

Mode Settings & full interface lineup Master Versatile Listening Systems

Optical, coaxial, USB, and analog I/O cover every source-from players and computers to classic audio gear. No extra converters needed. It seamlessly fits desktop Hi-Fi, pro setups, or home systems, enabling flexible switching and unrestricted listening experiences.

Questyle Signature Tuning A refined, analog-inflectedlistening experience

Meticulously tuned by Questyle, the SIGMA Pro reveals the authentic essence of music.

Deeply loved by enthusiasts

3.5mm & 4.4mm & 6.35mm Three Headphone Outputs + Manual Gain Easily Switch Your Exclusive Listening Mode

Mode Settings & full interface lineup Master Versatile Listening Systems

Optical, coaxial, USB, and analog I/O cover every source-from players and computers to classic audio gear. No extra converters needed. It seamlessly fits desktop Hi-Fi, pro setups, or home systems, enabling flexible switching and unrestricted listening experiences.

Questyle Signature Tuning A refined, analog-inflectedlistening experience

Meticulously tuned by Questyle, the SIGMA Pro reveals the authentic essence of music.

Supports stereo recording

SIGMA Pro features 3.5mm (AUX IN) and 4.4mm (BAL IN) analog inputs,allowing it to connect to audio equipment like turntables and mixers. It can then convert the analog signal to a digital file for external storage,with synchronous monitoring during the process.

Included in the box

SIGMA Pro
USB-C Power Adapter (depending on variant)
USB Charging Cable, 2m
Quick start guide

User_menu_20251027155341.pdf

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User_menu_20251027155342.pdf

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Featured Videos

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How to use SIGMA Pro

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Comparison table

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Frequently Asked Questions

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Our customer support is available Monday to Friday: 8am-8:30pm.Average answer time: 24h

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We want you to be completely satisfied with your purchase. Not the perfect fit? Just let us know — we’re happy to help! We offer free shipping on all U.S. returns.

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We want you to be completely satisfied with your purchase. Not the perfect fit? Just let us know — we’re happy to help! We offer free shipping on all U.S. returns.