Questyle Sigma Pro Bluetooth Portable DAC with Headphone Amplifier (Black)

Small in size, big on performance. SIGMA Pro is our flagship portable DAC/amp, built on Questyle’s pursuit of audio perfection. It is a technological benchmark that proves performance and portability can coexist, delivering a truly “Portable Professional audio equipment” experience.

• [Powerful & Refined Sound]: SIGMA Pro delivers robust driving power and exquisite sonic detail through its patented, fully discrete current-mode amplifier, achieving exceptional audio performance and high efficiency in a pocket-sized form factor.The fully discrete Current Mode Amplifier delivers a peak power of 5W and a peak current of 3A, enabling formidable driving force. With a peak output voltage of up to 20Vp-p and load distortion as low as 0.0002%, it ensures both power and precision.
• [Advanced Decoding Performance]: Utilizing dual ESS9069 DAC chips and a TTA decoding architecture, it provides high-end decoding performance surpassing typical portable devices, supporting PCM768 and DSD512 to meet the demands of top-tier sound quality.
• [MFi Certification]: The SIGMA Pro has obtained MFi license. This certification ensures perfect support for iPhone/iPad and connectivity within the ecosystem, meeting stringent comprehensive requirements for power consumption and compatibility of external devices, while also avoiding the risk of damage to phones and systems from using uncertified USB accessories.
• [Qualcomm Snapdragon Sound & LDAC Certified]: The SIGMA Pro incorporates the latest Qualcomm Snapdragon Sound technology, features Bluetooth version 5.4, and is fully certified by both Qualcomm Snapdragon Sound and LDAC. Snapdragon Sound utilizes leading Qualcomm aptX Adaptive technology and supports aptX HD lossless audio, delivering CD-quality 16-bit/44.1kHz lossless audio, 24-bit/48kHz, and 24-bit/96kHz high-resolution audio over Bluetooth.
• [Extensive Connectivity & Compatibility]: Equipped with high-speed USB interfaces and lossless Bluetooth, the SIGMA Pro is compatible with iOS, HarmonyOS, Android 5.1+, Windows 10 (driver-free), and macOS. Meticulously optimized by the Questyle Lab, it ensures flawless compatibility with a wide range of devices, including smartphones, computers, and professional audio systems.
• [Comprehensive Connectivity]: The SIGMA Pro is equipped with three headphone output jacks: 3.5mm, 4.4mm, and 6.35mm, paired with a manual gain adjustment function. Without complex operations, it allows you to easily switch between different working modes and personalized settings based on different headphones and listening scenarios, meeting diverse audio needs.
• [Stereo Recording Capability]: The SIGMA Pro supports stereo 3.5mm (AUX IN) / 4.4mm (BAL IN) inputs, allowing connection to audio equipment with LINE OUT analogue outputs such as turntables, microphone preamps, and mixing consoles. It simultaneously supports converting analogue signals into easily stored digital audio files. Supports high-quality analog input and digital recording with real-time monitoring, ensuring lossless capture and functioning as a portable audio workstation.