Questyle Sigma – Reference-Grade Portable DAC & Headphone Amplifier

The Questyle Sigma is a reference-level portable DAC and headphone amplifier designed to deliver desktop-class high-resolution audio in a compact, transportable form. Built for audiophiles, professionals, and serious music enthusiasts, Sigma combines advanced digital decoding, Questyle’s patented current-mode amplification, and flexible wired and wireless connectivity to create a powerful, no-compromise portable audio solution.

Whether used at a desk, on the go, or as part of a high-end mobile rig, the Questyle Sigma offers exceptional clarity, control, and musical realism.

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High-Resolution DAC Performance

At the core of Sigma is a high-performance AKM DAC, paired with Questyle’s proprietary Three-Tier Architecture (TTA) signal processing. This advanced digital design supports ultra-high-resolution audio formats, ensuring accurate decoding, expansive soundstage, and lifelike tonal balance.

• PCM playback up to 32-bit / 768 kHz
• Native DSD up to DSD512

Every detail is preserved, from subtle micro-dynamics to powerful transients.

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Patented Current-Mode Amplification

The Questyle Sigma features Questyle’s renowned Current Mode Amplifier (CMA) technology with four fully discrete, fully balanced amplification stages. This architecture delivers exceptional speed, control, and low distortion while providing the power needed to drive a wide range of headphones.

• Over 1200 mW output power at 32 Ω (balanced)
• High current delivery for demanding headphones
• Extremely low distortion and noise floor

From sensitive in-ear monitors to full-size planar headphones, Sigma drives them with authority and precision.

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Wired & Wireless Versatility

Sigma offers both lossless wired playback and high-quality Bluetooth audio, making it ideal for modern listening setups.

• USB-C digital input for smartphones, tablets, laptops, and desktops
• Bluetooth 5.4 wireless connectivity
• Support for high-quality Bluetooth codecs including LDAC, aptX Adaptive, aptX HD, AAC, and SBC

Dual headphone outputs provide maximum compatibility:

• 4.4 mm balanced output
• 3.5 mm single-ended output

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Long-Lasting Portable Power

A built-in 4,300 mAh rechargeable battery allows the Questyle Sigma to deliver extended listening sessions without sacrificing performance.

• Up to 12 hours of playback, depending on usage and output mode
• Efficient power management for consistent sound quality on the move

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Premium Build & Industrial Design

Crafted from CNC-machined aluminum, the Sigma features a robust, premium chassis designed for durability and heat dissipation. Thoughtful physical controls, gain settings, and LED indicators allow quick adjustments and intuitive operation, while its compact footprint makes it easy to integrate into any portable or desktop setup.

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Technical Specifications – Questyle Sigma

Specification	Details
DAC Architecture	High-resolution AKM DAC
Signal Processing	Questyle Three-Tier Architecture (TTA)
Supported Formats	PCM up to 32-bit / 768 kHz, Native DSD up to DSD512
Amplifier Design	Patented Current Mode Amplifier (fully balanced, discrete)
Output Power	>1200 mW @ 32 Ω (balanced)
Headphone Outputs	4.4 mm balanced, 3.5 mm single-ended
Bluetooth Version	Bluetooth 5.4
Bluetooth Codecs	LDAC, aptX Adaptive, aptX HD, AAC, SBC
USB Interface	USB-C (UAC audio)
THD+N	Approx. 0.0002%
Signal-to-Noise Ratio	Approx. 120 dB
Battery Capacity	4,300 mAh rechargeable lithium battery
Battery Life	Up to ~12 hours
Charging Time	Approx. 3.5 hours
Chassis Material	CNC-machined aluminum
Use Case	Portable & desktop headphone amplification
Included Accessories	USB-C cables, USB-A adapter, user manual, warranty card

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Ideal For

• Audiophiles seeking reference-grade portable audio
• Headphone enthusiasts using balanced or high-impedance headphones
• Professionals needing accurate, low-noise monitoring
• Listeners who want wired and wireless hi-fi flexibility
• Premium portable and desktop audio setups

Colour	Black
Brand	Questyle