body { font-family: Arial, sans-serif; background-color: #f9f9f9; color: #333; margin: 20px; } .container { max-width: 900px; margin: 0 auto; padding: 20px; background: #fff; border-radius: 10px; box-shadow: 0 0 10px rgba(0, 0, 0, 0.1); } h2, h3 { color: #0056b3; margin: 10px 0; } p { line-height: 1.75; margin: 8px 0; } ul { list-style-type: none; padding: 0; } ul li { margin: 6px 0; } .highlight { font-weight: bold; color: #0056b3; } .features, .technology, .specifications, .packing-list { margin-top: 20px; } .parameters-table { width: 100%; border-collapse: collapse; margin-top: 20px; } .parameters-table th, .parameters-table td { padding: 8px; border: 1px solid #ddd; text-align: left; vertical-align: top; } .parameters-table th { background-color: #f4f4f4; } .note { font-size: 13px; color: #666; margin-top: 10px; } Questyle SIGMA Portable DAC Headphone Amplifier Pure Power. King of Detail. Redefining your audio experience with advanced GaN technology. Key Features: Gallium Nitride (GaN) Power Transistors: Delivers superior performance with ultra-high switching frequencies up to 1 MHz for pure sound clarity across the frequency range. Current-Mode Amplifier: Fully discrete, fully balanced design with a peak power output of 5W and peak current of 3A, ensuring powerful, controlled sound. AKM AK4493 DAC Chip: Supports PCM768kHz and DSD512 decoding, offering desktop-level sound quality in a portable form. Bluetooth 5.4 with Qualcomm Snapdragon Sound: Supports SBC, aptX Adaptive, aptX HD, LDAC, and ensures high-quality wireless audio streaming. 4300mAh Lithium Battery: Supports up to 12 hours of battery life with a dual-USB smart battery management system for longer, uninterrupted listening sessions. Compatibility: Fully compatible with iOS, Android, Windows, macOS, and HarmonyOS, including seamless integration with Apple devices via MFi certification. Ergonomic & Durable Design: Aerospace-grade aluminum alloy chassis, with precision CNC machining and anodized finish for durability and style. Technology & Innovations: The Questyle SIGMA Portable DAC Headphone Amplifier utilizes cutting-edge Gallium Nitride (GaN) technology and AKM’s AK4493 DAC chip to provide extraordinary audio quality and power in a compact, portable form. The Current-Mode amplifier, with its fully discrete, fully balanced design, ensures powerful amplification with minimal distortion, offering an immersive listening experience. Combined with its advanced Bluetooth 5.4 support and high-capacity battery, SIGMA redefines what’s possible in portable high-fidelity sound. Technical Specifications: Parameter Details DAC Chip AKM AK4493 Power Transistors Infineon Gallium Nitride (GaN) Current-Mode Amplifier Fully discrete, fully balanced with peak power of 5W and 3A current Bluetooth Bluetooth 5.4, Qualcomm Snapdragon Sound, aptX Adaptive, aptX HD, LDAC Battery 4300mAh Lithium battery, up to 12 hours battery life USB Charging Dual USB ports, 2A charging current, USB-C USB Playback Support PCM 768kHz/32bit, DSD512, DSD DoP Input / Output 3.5mm & 4.4mm headphone outputs, USB input Size 158 x 64 x 28 mm Weight 400g Package Includes: Questyle SIGMA Portable DAC Headphone Amplifier × 1 USB-C to USB-C Adapter × 1 USB-A to USB-C Adapter × 1 Carrying Case × 1 User Manual & Warranty Card × 1 Note: Performance may vary depending on the connected devices, audio formats, and settings. Compatibility with smartphones, tablets, and PCs is guaranteed for optimal performance.
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