The Questyle SIGMA is a portable DAC amplifier with its own 4300mAh battery, PCM support up to 768kHz, DSD512 and a Bluetooth 5.4 receiver. It's built for phone-first listeners with demanding IEMs or efficient full-size headphones who want more than a dongle without draining the phone.
Who the Questyle SIGMA is for
Phone-first listeners: Its 4300mAh battery runs the amp on its own supply instead of draining the phone it's attached to.
Pocket setups without a phone cable: Bluetooth 5.4 makes it a wireless receiver, so the phone can stay in your pocket with no cable to the SIGMA.
Demanding IEMs and efficient full-size headphones: It fits the gap where a dongle isn't enough but a desktop stack is too much to carry.
Hi-res file libraries: It handles PCM up to 768kHz and DSD512.
vs iBasso DC Elite: The DC Elite is a 60.5 g USB-C DAC/amp built on a ROHM BD34301EKV chip; choose the SIGMA if you also want to listen over a Bluetooth 5.4 link.
vs xDuoo XD05T: The XD05T pairs a dual-tube stage with dual ES9039Q2M chips and Bluetooth 5.1; pick it if you want tubes in a portable rig, or the SIGMA for its Bluetooth 5.4 receiver.
Yes. Every unit we sell is genuine and brand-new, shipped in its original packaging, and backed by our 1-year TonePier warranty and 45-day returns.
Where does my order ship from, and how long does it take?
Every order ships from our warehouse in China, with full tracking, and most orders ship within 3 business days. Shipping is free on every order; most US orders arrive within 7–15 business days and most orders to other countries within 7–20 business days — see our shipping policy for details.
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.
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