{"product_id":"questyle-sigma","title":"Questyle Sigma | Portable DAC and Amp","description":"\u003cp\u003e\u003cimg style=\"display: block; margin-left: auto; margin-right: auto; width: 50%;\" alt=\"Questyle logo black\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0023\/9255\/5595\/files\/questyle-nhb12-logo-blk.jpg?v=1698074726\"\u003e\u003c\/p\u003e\n\u003ch4\u003eThe Sigma DAC\/Amp Embodies Questyle's Endless Pursuit of Audio Excellence and Innovation\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eAKM AK4493 DAC\u003c\/li\u003e\n\u003cli\u003eFeatures Questyle's TTA decoding architecture \u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eEquipped with latest generation of Qualcomm Snapdragon technology\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003eSupports dedicated IEM mode\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg alt=\"Questyle Sigma DAC\/amp x2 front and back view right 3 quarter angle sitting on ledge on black background\" height=\"1360\" width=\"2048\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0023\/9255\/5595\/files\/questyle-sigma-banner.webp?v=1761073544\"\u003e\u003c\/p\u003e\n\u003ch3\u003eSigma\u003c\/h3\u003e\n\u003cp\u003eSigma was born from Questyle's uncompromising pursuit of excellence, featuring an innovative decoding architecture and supporting up to PCM768 and DSD512 decoding capabilities. The patented CMA technology combined with a fully-discrete, fully balanced design delivers professional-grade performance in a portable form factor. \u003c\/p\u003e\n\u003ch3\u003eRetro-Inspired LED Accents\u003c\/h3\u003e\n\u003cp\u003eThe Sigma features a precision-crafted chassis that embodies both aesthetic refinement and technical excellence. Its CNC-machined, ultra-fine sandblasted aerospace aluminum body is paired with custom optical-grade transparent glass, creating a striking visual contrast. Gradient dot-matrix detailing adds depth and sophistication, while the RF signal suppression coating ensures clean, stable performance.\u003c\/p\u003e\n\u003ch3\u003ePatented Current Mode Amplifier\u003c\/h3\u003e\n\u003cp\u003eSigma incorporates four sets of patented, fully discrete, fully balanced CMA headphone\/output amplifiers. Balancing size, power consumption, and sonic performance is the core challenge in portable audio devices. Questyle's patented Current Mode Amplifier achieves both powerful drive capability and refined sonic character. The fully discrete CMA delivers peak power up to \u0026gt;5W, peak current up to 3A, enabling exceptional dynamic drive capability. \u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"Questyle Sigma DAC\/amp internal chip on black background\" height=\"1360\" width=\"2048\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0023\/9255\/5595\/files\/questyle-sigma-internal.webp?v=1761074071\"\u003e\u003c\/p\u003e\n\u003ch3\u003eDesktop-Level Performance\u003c\/h3\u003e\n\u003cp\u003eTo exceed customer expectations for decoding performance, Sigma uses the highly acclaimed AK4493 DAC from AKM. Additionally, it is engineered with Questyle's TTA architecture to deliver desktop-class audio performance. \u003c\/p\u003e\n\u003cp\u003eJust as only a pure black background reveals the richness of colors, only a sufficiently low noise floor allows the capture of sonic details, enabling true Hi-Fi audio. Sigma's high resolution grants it an ultra-low noise floor, achieving -130dB in Questyle's lab test environment. \u003c\/p\u003e\n\u003ch3\u003eComprehensive Compatibility\u003c\/h3\u003e\n\u003cp\u003eSigma supports high-speed USB connections with smartphones and PCs, as well as lossless Bluetooth audio. Output modes can be switched between headphone amplifier and line-out for professional monitors or Hi-Fi systems. It can also enhance PC audio quality in settlings like live concerts. Questyle Lab conducted extensive compatibility testing, ensuring full compatibility with iOS, HarmonyOS, and Android 5.1+. For PC, it supports Windows 10 1803+ (driverless) and macOS. \u003c\/p\u003e\n\u003ch3\u003eApple MFi Certification\u003c\/h3\u003e\n\u003cp\u003eSigma is officially MFi-certified by Apple, ensuring flawless compatibility with iPhone, iPad, and the broader Apple ecosystem. This certification reflects full compliance with Apple’s strict standards for power efficiency and external device performance, while safeguarding against potential risks posed by uncertified USB accessories. \u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0023\/9255\/5595\/files\/questyle-sigma-lifestyle_478ba773-162c-4f38-ab59-82ef0f348675.webp?v=1762977653\" width=\"2048\" height=\"1360\" alt=\"Questyle Sigma DAC\/amp leaning on headphone stand with tube amp and headphones front right 3 quarter\"\u003e\u003c\/p\u003e\n\u003ch3\u003eQualcomm Snapdragon and LDAC Certification\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eSigma integrates Qualcomm’s latest-generation \u003cspan class=\"s1\"\u003eSnapdragon Sound™\u003c\/span\u003e platform with \u003cspan class=\"s1\"\u003eBluetooth 5.4\u003c\/span\u003e, earning full certification for both \u003cspan class=\"s1\"\u003eSnapdragon Sound\u003c\/span\u003e and \u003cspan class=\"s1\"\u003eSony LDAC\u003c\/span\u003e. Leveraging Qualcomm’s advanced \u003cspan class=\"s1\"\u003eaptX Adaptive\u003c\/span\u003e technology, Snapdragon Sound enables support for \u003cspan class=\"s1\"\u003eaptX HD lossless audio\u003c\/span\u003e, delivering \u003cspan class=\"s1\"\u003eCD-quality 16-bit\/44.1kHz\u003c\/span\u003e lossless streaming and \u003cspan class=\"s1\"\u003ehigh-resolution 24-bit\/48kHz–96kHz \u003c\/span\u003eaudio over Bluetooth.\u003c\/p\u003e\n\u003ch3 class=\"p1\"\u003eAdditional Features\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e3.5mm + 4.4mm Outputs\u003c\/strong\u003e\u003cbr\u003eSigma features both 3.5mm SE and 4.4mm BAL outputs. Combined with manual gain selection and output mode settings, it perfectly drives sensitive IEMs, high-impedance headphones, and Hi-Fi audio systems. \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIEM Signal Processing Path\u003c\/strong\u003e\u003cbr\u003eSigma supports a dedicated IEM mode. In this mode, the signal path is minimized, and ultra-fine 64-step volume control is enabled. This ensures an optimal listening experience with sensitive in-ear monitors. \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDual USB-C Ports\u003c\/strong\u003e\u003cbr\u003eDual USB-C ports allow the separation of data transfer and charging\/power.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProfessional-Grade Monitoring\u003c\/strong\u003e\u003cbr\u003eUsing a 3.5mm-to-RCA or 4.4mm-to-XLR balanced cable, music professionals can use Sigma anywhere as a high-quality interface. Connect mobile devices, PCs, or desktops to Hi-Fi equipment. \u003c\/p\u003e","brand":"Questyle","offers":[{"title":"New","offer_id":41842306941003,"sku":"QU-SIGMA","price":599.0,"currency_code":"USD","in_stock":true},{"title":"Open Box","offer_id":41958668369995,"sku":"QU-SIGMA-OB","price":599.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0023\/9255\/5595\/files\/questyle-0-sigma-thumb.webp?v=1761074565","url":"https:\/\/bloomaudio.mom\/products\/questyle-sigma","provider":"Bloom Audio","version":"1.0","type":"link"}