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Questyle Sigma Pro Bluetooth 5.4 Headphone Amplifier USB DAC AMP with LDAC | MFi Certified Portable DAC with aptX Lossless,PCM768/DSD512 6.35mm/4.4mm/3.5mm Output for Smartphones/PC/ Home Audio(Black) - color: Black

Questyle Sigma Pro Bluetooth 5.4 Headphone Amplifier USB DAC AMP with LDAC | MFi Certified Portable DAC with aptX Lossless,PCM768/DSD512 6.35mm/4.4mm/3.5mm Output for Smartphones/PC/ Home Audio(Black) - color: Black

$1,492.34 USD
$1,492.34 USD
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About this item

  • [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.

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Reviews

  • ⭐⭐⭐⭐⭐

    Olivia Bennett — Seattle, Washington

    Listenora has a practical selection of audio accessories that made it easy to find what I needed. The product information was clear, ordering was simple, and everything fit naturally into my everyday listening setup.

  • ⭐⭐⭐⭐⭐

    Ethan Parker — Austin, Texas

    I liked how easy it was to browse the different audio categories. The accessories I ordered were straightforward to use and helped make my desk setup feel cleaner, more organized, and more convenient.

  • ⭐⭐⭐⭐⭐

    Samantha Reed — Denver, Colorado

    The item arrived as expected and worked well with my setup. I especially appreciated the clear product details, which helped me check the connection type and compatibility before placing my order.

  • ⭐⭐⭐⭐⭐

    Michael Turner — Portland, Oregon

    Listenora offers useful audio products without making the shopping process feel complicated. My order was easy to track, the accessories were neatly packaged, and I would consider shopping here again for future audio needs.

FAQ

What types of products does Listenora sell?

Listenora offers everyday audio accessories for work, gaming, travel, fitness, and personal listening. Our selection includes headphones, earbuds, microphones, speakers, audio cables, adapters, stands, protective cases, replacement parts, and cleaning accessories.

How can I check whether a product is compatible with my device?

Please review the connector type, supported devices, dimensions, operating-system requirements, and compatibility information shown on the product page. For additional assistance, contact us with the exact brand and model number of your device before ordering.

How much does shipping cost?

Unless a different rate or promotion is displayed during checkout, we charge a flat shipping fee of $6.90 per order. International duties, taxes, customs charges, and other third-party fees are not included unless expressly stated.

How long does order processing take?

Orders are generally processed within 1–3 business days after payment is confirmed. Processing may take up to 5 business days during holidays, promotional events, high-demand periods, or inventory reviews.

How long will delivery take?

Estimated delivery is generally 5–10 business days within the United States and 10–20 business days for eligible international destinations after shipment. Delivery times are estimates and may be affected by carriers, customs, weather, address issues, or other circumstances.

How can I track my order?

Once your order has shipped, tracking information will generally be sent to the email address used during checkout. Tracking may take 2–5 business days after dispatch to display its first meaningful update.

Can I change or cancel my order?

Please contact us as soon as possible after placing your order. We will make reasonable efforts to assist, but changes or cancellations cannot be guaranteed once processing, fulfillment, or shipment has started.

What is your return policy?

Eligible unused products may generally be returned within 30 days after confirmed delivery. Products must meet our return conditions and receive authorization before being shipped back. Certain opened or used hygiene-sensitive audio products may not qualify for change-of-mind returns.

What should I do if my item arrives damaged, defective, or incorrect?

Contact us promptly with your order number, a description of the issue, and clear photographs or videos of the product, packaging, and shipping label. Please retain all original packaging and accessories until the issue has been reviewed.

How can I contact Listenora customer support?

Email us at gtrefasnhuim@gmail.com. Please include your full name, order number, and a clear description of your question. Most inquiries are reviewed within 1–3 business days.

Made for Everyday Listening

At Listenora, we believe audio accessories should do more than simply connect a device. They should make everyday listening feel easier, more comfortable, and better organized.

Every routine has different audio needs. Some moments call for clear communication during work or gaming, while others require compact, dependable accessories for travel, exercise, or relaxed listening. That is why Listenora focuses on practical audio products designed to support real everyday situations without making your setup feel complicated.

Our collection is selected with usability in mind — from headphones, earbuds, microphones, and speakers to cables, adapters, stands, protective cases, replacement parts, and cleaning accessories. Each product is chosen to help improve comfort, connectivity, organization, and convenience across a wide range of audio setups.

Listenora is made for people who value useful products, simple connections, and a more enjoyable listening experience. Whether you are preparing for a meeting, settling into a gaming session, heading out for a workout, or organizing your audio equipment, we are here to help make everyday sound work better for you.

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