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Questyle

Questyle SIGMA Pro Portable DAC Amplifier

Questyle SIGMA Pro Portable DAC Amplifier

  • Authorized Retailer
  • Free US Shipping $49+
  • 1-Year Warranty
  • 45-Day Returns
$892.99 USD
$892.99 USD
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The Questyle SIGMA Pro is a portable DAC and headphone amplifier built around four current-mode amplification circuits — Questyle's signature approach, and the thing that separates their gear from the voltage-feedback designs everyone else ships. XMOS XU316 handles USB, dual ES9069 chips handle conversion.

Four amplification circuits in a portable is serious hardware, not a dongle with ambitions. This is for someone driving demanding headphones away from a desk, or who wants desktop-class amplification without a desktop's footprint and power brick. Pair it with planars or high-impedance dynamics where a standard dongle runs out of steam, and it will feel like a genuine upgrade rather than a sideways move.

  • Four current-mode amplification circuits
  • Dual ES9069 DAC chips
  • XMOS XU316 USB controller
  • Authorized Questyle retailer — 45-day returns
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Good to know

Frequently asked questions

Is this unit genuine?

Yes. TonePier is an authorized retailer — every unit comes from the brand or its official distributor, carries a valid serial number and is covered by the full manufacturer warranty.

How long does shipping take?

SKUs stocked in our US warehouse ship within 1–2 business days. Items shipped direct from our China hub typically arrive in 8–15 days with full tracking. The product page tells you which applies before you order.

What if it isn't for me?

You get 45 days to decide. Keep the packaging, keep it in like-new condition, and send it back for a refund. Ear tips unsealed for hygiene reasons are fine — we expect you to actually listen.