Questyle Sigma portable Bluetooth DAC and headphone amplifier with circuit board
Questyle Sigma portable DAC and headphone amplifier with product packaging
Woman using Questyle Sigma portable DAC and headphone amplifier with smartphone
Close-up of Questyle Sigma DAC circuit board with technical specifications
Questyle Sigma Hi-Res Bluetooth DAC portable headphone amplifier circuit board
Diagram of TTA signal processing for Questyle Sigma DAC
Graph showing high noise floor and audio clarity of Questyle Sigma DAC
Smartphone and laptop with Questyle Sigma DAC for wireless high-res audio
Questyle Sigma Bluetooth DAC with Apple MFi certification for iPhone compatibility
Questyle Sigma Bluetooth DAC with Snapdragon sound for wireless audio quality
Questyle Sigma portable DAC with headphone jack and volume controls
Questyle Sigma DAC and headphone amplifier with circuit board and controls
Questyle Sigma DAC with 430mAh battery and audio ports
Questyle Sigma audio device with control buttons and circuit diagram
Diagram of Questyle Sigma Bluetooth DAC with front panel controls
Questyle Sigma portable DAC headphone amplifier packaging accessories

Questyle

Questyle - Sigma Hi-Res Bluetooth DAC Portable Headphone Amplifier

Sale price₹ 56,579Regular price MRP:₹ 81,119

    AKM AK4493 Hi-Res DAC with current-mode amplifier

    Bluetooth 5.4 with Snapdragon Sound, LDAC and aptX Adaptive

    Powerful balanced output up to 1200mW at 32Ω

    Supports PCM 768kHz / 32bit and native DSD512 playback

    4300mAh battery delivering up to 12 hours playback

    Portable aluminum design with 3.5mm and 4.4mm outputs
Estimated Delivery within 4 to 6 weeks.

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Estimated Delivery within 4 to 6 weeks.

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RETURN POLICY

10 Days Replacement Policy for Manufacturing defects. Info All products are covered by 10 Day Replacement Guarantee. This product is eligible for a free replacement, in case you receive a damaged, defective or different item. Please keep the product in its original condition with all accessories & packaging for a successful return. We may contact you to assess the damage or defect before issuing a replacement. Accessories like cables and eartips are not backed up the manufacturer's warranty.

Please note that physical damage cases need to be brought to our notice within 24 hours.

Simply Contact us through the chat window if you find any issues with your order.

WARRANTY

1 Year Manufacturer's Warranty

Description

The Questyle Sigma Portable Bluetooth DAC & Headphone Amplifier is designed for audiophiles who want desktop-level audio performance in a portable device. Powered by the AKM AK4493 VELVETSOUND DAC and Questyle’s patented fully discrete Current-Mode Amplifier (CMA) architecture, Sigma delivers exceptional clarity, powerful dynamics, and ultra-low distortion for high-resolution music playback. With balanced output power exceeding 1200mW at 32Ω, it easily drives everything from sensitive IEMs to demanding 300Ω headphones while maintaining a clean background and accurate sound reproduction. The device supports Hi-Res audio decoding up to PCM 768kHz/32bit and native DSD512, ensuring studio-grade digital-to-analog conversion. Wireless connectivity is equally advanced with Bluetooth 5.4, Qualcomm Snapdragon Sound, aptX Adaptive, aptX HD, LDAC, SBC, and LE Audio, delivering high-quality wireless streaming from smartphones, tablets, and computers. A 4300mAh battery provides up to 12 hours of playback, while dual USB-C ports allow charging while listening. Featuring both 3.5mm single-ended and 4.4mm balanced outputs, the Sigma functions as a versatile portable DAC, headphone amplifier, and USB audio interface compatible with iOS, Android, macOS, Linux, and HarmonyOS devices. With its aerospace aluminum chassis, transparent circuit design, and compact 164g build, the Questyle Sigma is a premium portable DAC/amp ideal for high-resolution music streaming, professional monitoring, and audiophile listening on the go.

DESKTOP-LEVEL CURRENT-MODE AMPLIFIER TECHNOLOGY

The Questyle Sigma uses the company’s patented fully discrete Current-Mode Amplifier (CMA) architecture, delivering powerful drive capability with extremely low distortion and fast transient response. With over 1200mW output at 32Ω and peak current up to 3A, the amplifier can effortlessly power both sensitive in-ear monitors and high-impedance headphones up to 300Ω while maintaining exceptional detail and dynamic performance.

AKM AK4493 HI-RES DAC FOR AUDIOPHILE SOUND

At the heart of the Sigma is the AKM AK4493 VELVETSOUND DAC, combined with Questyle’s proprietary signal processing architecture to deliver accurate digital-to-analog conversion. The device supports high-resolution audio decoding up to PCM 768kHz / 32-bit and native DSD512, allowing users to experience studio-quality music playback with exceptional clarity, natural tonality, and low noise levels.

ADVANCED BLUETOOTH WITH SNAPDRAGON SOUND

Sigma features Bluetooth 5.4 with Qualcomm Snapdragon Sound, supporting advanced wireless codecs including aptX Adaptive, aptX HD, LDAC, SBC, and LE Audio. This ensures stable wireless connections with smartphones, tablets, and laptops while maintaining high-resolution audio streaming quality for music, gaming, and video playback.

VERSATILE CONNECTIVITY & BALANCED OUTPUT

Designed for maximum flexibility, the Sigma includes 3.5mm single-ended and 4.4mm balanced headphone outputs along with dual USB-C ports for separate data transfer and charging. This configuration allows the device to function as a portable DAC, headphone amplifier, and USB audio interface, suitable for mobile listening, desktop setups, and professional audio monitoring.

LONG BATTERY LIFE WITH PORTABLE DESIGN

The built-in 4300mAh rechargeable battery delivers up to 12 hours of continuous playback, making the Sigma ideal for travel and daily listening. Charging takes approximately 3.5 hours via USB-C, and the device weighs only about 164g, offering a compact yet powerful portable audio solution.

PREMIUM BUILD & PROFESSIONAL AUDIO FEATURES

Constructed with a precision-machined aluminum chassis and transparent design panels, the Sigma showcases its internal circuitry while providing durability and premium aesthetics. Additional features such as IEM mode, adjustable gain levels, and line-out functionality make it suitable for audiophiles, musicians, and sound engineers who require portable high-performance audio equipment.

Specifications

Brand
Questyle
Model
Sigma
Product Type
Portable Bluetooth DAC & Headphone Amplifier
DAC Chip
AKM AK4493 VELVETSOUND
Amplifier Architecture
Fully Discrete Current-Mode Amplifier (CMA)
Output Power
>1200mW @32Ω Balanced
Peak Current
Up to 3A
Bluetooth Version
Bluetooth 5.4
Bluetooth Codecs
Snapdragon Sound, aptX Adaptive, aptX HD, LDAC, SBC, LE Audio
USB Audio Support
PCM 768kHz / 32bit, Native DSD512
Headphone Outputs
3.5mm Single-Ended, 4.4mm Balanced
Line Out
>2.5V SE / >6.8V Balanced
Battery Capacity
4300mAh
Playback Time
Up to 12 Hours
Charging Time
Approx. 3.5 Hours
THD+N
<0.0002%
Signal-to-Noise Ratio
120dB
Weight
Approx. 164g

Box Content

    What will you get
  • 1x Questyle Sigma DAC / Headphone Amplifier
  • 1x USB-C to USB-C Data Cable
  • 1x USB-C Charging Cable
  • 1x USB-C to USB-A Adapter
  • 1x Quick Start Guide

Warranty

1 YEAR WARRANTY

Don't worry, Questyle - Sigma Hi-Res Bluetooth DAC Portable Headphone Amplifier comes with a 1 Year warranty against manufacturing defects. We guarantee that every product on Concept Kart is genuine and backed by the Manufacturer's warranty.

Read more about Concept Kart's warranty policy.

Shipping Policy

FREE SHIPPING ON ALL ORDERS

At Concept Kart, we offer FREE standard shipping on all orders across India. Orders placed before 2 PM are usually dispatched on the same working day, while orders placed after 2 PM are dispatched on the next working day (excluding Sundays and public holidays) from our Delhi warehouse.

Delivery usually takes 1–2 business days in Delhi, the next working day in metro cities, and 2–7 business days in other locations after dispatch. We use trusted courier partners, including BlueDart and Delhivery, and share tracking details via email or WhatsApp. For prepaid orders, OTP verification is required at delivery for added security. Share the OTP only after receiving your package.

COD is available for orders between ₹1,500 and ₹10,000, with cash handling charges of ₹50 (up to 1 kg) and ₹100 (above 1 kg), displayed at checkout.

Delivery may be delayed due to festivals, extreme weather, floods, protests, or courier disruptions. Pre-orders follow the estimated timelines mentioned on their product pages.

For shipping or delivery assistance, contact customercare@conceptkart.com with your order number.