Questyle SIGMA Pro Flagship Wireless Hi-Res Lossless Portable DAC & Amp

Studio-grade performance. Portable form. Zero compromise.

The Questyle SIGMA Pro is a true flagship portable DAC & headphone amplifier, built for audiophiles, professionals, and creators who demand reference-level sound anywhere. Designed around Questyle’s legendary Current Mode Amplifier technology, SIGMA Pro delivers exceptional speed, transparency, and control — whether you're driving sensitive IEMs or power-hungry full-size headphones.

At its core lies a dual-mono ESS ES9069Q DAC architecture, paired with four fully discrete, fully balanced current-mode amplification stages under Questyle’s proprietary Three-Tier Architecture (TTA). The result is massive dynamic headroom, ultra-low distortion, and a presentation that remains clean, fast, and emotionally engaging even at high output levels.

Powered by an XMOS XU316 USB interface, SIGMA Pro supports PCM up to 768 kHz / 32-bit, native DSD512, and full MQA decoding, delivering master-grade playback from smartphones, laptops, tablets, and digital transports.

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Flagship Power Meets True Portability

Despite its compact form, SIGMA Pro offers serious drive capability — with up to 25 Vp-p output swing, over 8 W peak power design headroom, and 5 A instantaneous current. This makes it equally capable with ultra-sensitive IEMs and demanding planar headphones.

Three dedicated headphone outputs — 3.5 mm single-ended, 4.4 mm balanced, and 6.35 mm full-size — allow instant compatibility across all setups without adapters.

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Creator-Ready Connectivity & Recording

Beyond playback, SIGMA Pro is also a powerful portable audio hub.
With 3.5 mm single-ended and 4.4 mm balanced analog inputs, it integrates seamlessly with turntables, phono stages, mixers, and external sources.

A standout feature is stereo line-in recording, allowing analog sources to be captured digitally at 48 kHz / 24-bit via USB, with real-time monitoring — perfect for content creators, musicians, and mobile recording setups.

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Certified Wireless Hi-Res Audio

Built on Bluetooth 5.4 with Qualcomm Snapdragon Sound, SIGMA Pro supports:

• aptX Adaptive

• aptX HD

• LDAC

• SBC & LE Audio

With both Snapdragon Sound and Sony LDAC certification, wireless playback remains stable, low-latency, and remarkably close to wired fidelity — ideal for modern audiophile lifestyles.

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Thoughtful Design, Built to Last

The chassis follows a Bauhaus-inspired industrial design, crafted from sand-blasted aviation-grade aluminum, accented with a Kunlun glass window. The result is a device that looks as refined on a studio desk as it feels in hand.

A 4300 mAh battery delivers up to 12 hours of playback, while dual USB-C ports enable play-while-charging with reduced smartphone battery drain — a critical feature for long listening or studio sessions.

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Specifications

Model: Questyle SIGMA Pro
DAC: Dual ESS ES9069Q (Dual-Mono)
Amplifier: Fully discrete Current Mode Amplifier ×4
USB Interface: XMOS XU316 (UAC 2.0)

Digital Inputs:

• USB: PCM 44.1–768 kHz / 32-bit

• DSD Native 64/128/256/512

• DoP DSD64/128/256

• MQA Full Decode

• Optical & Coaxial: PCM up to 192 kHz / 24-bit

Analog Inputs:

• 3.5 mm SE In (1 Vrms)

• 4.4 mm Balanced In (2 Vrms)

Headphone Outputs:

• 6.35 mm

• 3.5 mm

• 4.4 mm Balanced

Output Power:

• 1200 mW @ 32 Ω (Balanced)

• 160 mW @ 300 Ω (Balanced)

• 40 mW @ 300 Ω (Single-Ended)

Performance:

• THD+N: 0.0002%

• SNR: 120 dB

• Frequency Response: 20 Hz – 20 kHz (+0.8 dB)

Gain Control:

• Line/HP: Low / High / Studio

• IEM: Low / High

Bluetooth:
Bluetooth 5.4 • Snapdragon Sound
aptX Adaptive • aptX HD • LDAC • SBC • LE Audio

Recording:
Stereo 48 kHz / 24-bit via USB (with monitoring)

Battery:
4300 mAh • Up to 12 hours
Charging Time: ~3 hours

Dimensions / Weight:
Approx. 155.7 × 85 mm • ~330.8 g

System Support:
Windows, macOS, Linux, Android, iOS/iPadOS (MFi), HarmonyOS

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Package Contents

• Questyle SIGMA Pro Portable DAC & Amp

• USB-C to USB-C Cable

• USB-A to USB-C Adapter

• Warranty Card

• User Manual