

Onix Beta XI2: Brilliant On A Desk, Tricky In Your Pocket
Pros:
- Snappy, simple and intuitive UI with a clean play/pause button and volume rocker
- Tube mode genuinely adds a layer of warmth and lushness that makes bright IEMs more listenable
- As a basshead I find the tube character really enjoyable
- Excellent power output for a dongle at up to 550 mW at 32 ohms
- The side tube windows with their subtle glow look fantastic
- PC use is essentially flawless for me
Cons:
- Cannot use this with a phone over regular WiFi or LTE without hearing an annoying scratch in the audio
- Detail heads may find the upper treble layer over-smoothened in tube mode
- The interference essentially rules this out as a truly portable phone dongle
The Onix Beta XI2 is a dual CS43198, dual JAN6418 tube dongle DAC from Shanling's ONIX sub-brand, and it occupies a genuinely interesting niche: a portable tube hybrid that brings warmth and musicality to your listening chain without asking you to carry a box around. I have been using it primarily with my PC setup and I have to say it has been one of the more enjoyable listens I have had in a while. But there is a caveat that phone users absolutely need to be aware of before buying, and I will get to that.
Disclaimer:
A huge thanks to SushiiFi for providing this unit for review. All thoughts and opinions are entirely my own.
Design and Build
The Beta XI2 is pretty thick, but it still qualifies as a pocketable dongle. The metal body feels solid and well put together, and the two side windows that reveal the glowing JAN6418 tubes are a genuinely nice visual touch. It adds a certain personality to the device that I appreciate.
The OLED display shows playback format, volume, and gain information clearly. The UI is where I was happily surprised: it is very snappy and responsive, with a simple play/pause button and a volume rocker that just work without any lag or fidgeting. Coming from other dongles that have made me fight with their controls, this felt refreshing.
Technical Specs:
| Spec | Value |
|---|---|
| DAC Chipset | Dual Cirrus Logic CS43198 |
| Amplifier | 4x BUF634, 2x OPA1662 |
| Tube Stage | Dual JAN6418 (visible through side windows) |
| Output Power | Up to 550 mW at 32 ohms (balanced) |
| Display | 0.87-inch OLED |
| Hi-Res Support | PCM 32-bit/768 kHz, DSD512 |
| Dimensions | 69.8 x 39 x 14 mm |
| Weight | 45.3 g |
Sound Impressions
This is where the XI2 earns its keep for me. The tube mode is not just a gimmick: it genuinely adds a layer of warmth and lushness to the presentation that I find very enjoyable. IEMs that teeter on the sharper or brighter side become more listenable and musical in tube mode, which is exactly the kind of tonal shift I want from a source device.
Bass
The low end feels weighty and textured in tube mode. As a basshead I find the added warmth gives the bass a more satisfying, fuller body without it ever getting loose or uncontrolled. It is not an exaggerated bass boost, more like the low end just feels more present and enjoyable to sit with.
Mids
The mids carry that ONIX house sound: balanced, natural, and with a hint of warmth that keeps vocals sounding smooth and lifelike. In tube mode especially, the midrange feels lush and easy to listen to for long sessions.
Treble
This is the one area where I acknowledge tube mode may not suit everyone. The upper treble feels over-smoothened to some degree, and detail heads who want air and sparkle may find that the tube is doing a little too much rounding off up top. For me personally this is not a problem, but it is worth flagging if you are treble-forward in your preferences.
The Phone Interference Issue
I want to be very direct about this because it is the most important thing for a potential buyer to know. The RF interference in tube mode when a phone is nearby is not subtle. If my phone is anywhere near the XI2 while it is in tube mode, I hear an annoying scratch in the audio. If my phone is on top of it, it is even worse. WiFi and LTE signals are the main culprits, and the only real fix is airplane mode. My personal solution was to use it exclusively with my PC, and in that context I had zero interference and a wonderful listening experience. But if your plan is to attach this to the back of your phone and stream music on the go, you will be frustrated.
Final Impressions
The Onix Beta XI2 is a genuinely wonderful dongle DAC for the right use case. The tube mode is real, the warmth is real, the power is real, and the UI is a pleasure to use. For PC or laptop use where your phone is not in the picture, this is easily in the top tier of what I have heard. The 0.5 deduction comes entirely from the RF interference issue that makes phone-based listening a frustrating experience rather than an enjoyable one.
Who is this for?
- PC or laptop users who want tube warmth and lushness without the noise penalty
- Bass enjoyers and warm-signature lovers who want smooth, musical listening
- People with brighter IEMs that could benefit from the tube's smoothing character
Who is this not for?
- Phone users who want a portable dongle for on-the-go streaming
- Detail heads who want maximum treble air and upper extension
- Anyone not willing to deal with RF interference management