Cubilux UCSTR-B3 USB to SPDIF Input Output Adapter, 2-in-1 USB to TOSLINK Optical Transmitter Receiver Compatible with MacBook, Laptop, Computer, PC, Stereo Sound ONLY, NOT for Phone or Tablet

This USB digital converter does just what it advertises at a reasonable price point. It is plug and play in Windows 11, showing as a generic stereo in stereo out class compliant interface supporting 24bit 192 kHz supporting DTS and Dolby Digital pass through to digital receivers (did not test either of those). Although using a Savitech chipset (9123L as confirmed by Cubilux support) it unfortunately does not supply ASIO drivers. A very similar product that does include an ASIO driver would be the Hifime S2 Digi which supports up to 32bit 384kHz. However I can't really dock points on this Cubilux since it doesn't advertise ASIO support and is priced accordingly cheaper. The construction of the Cubilux vs the S2 Digi is a bit nicer since it is made of metal instead of plastic, and uses a USB-C input port instead of Micro-USB. Works reliably for my application which is to provide a simultaneous stereo S/PDIF input and output interface for an old MOTU Audio Express device whose vendor-provided USB Windows drivers crackle and often fail to load after wake from sleep.Contrary to what it says on the listing it is actually also plug and play in Android on my S24 Ultra where I was able to access both the output and input. Same on Ubuntu Linux.Hopefully Cubilux will consider ASIO support in a v2 update.

In general, it does what it is supposed to do without any hassles. It is stable and does not require any drivers. But there are two issues which might be deal breakers for some users.First, it does not clock to external source and does not go higher than 48 KHz. If you are pairing that with some audio interface, that might cause crackles.Second, and that is more serious, somehow it does not let Windows to go into sleep mode. It looks like that it emits some events all the time, so, no matter what power setting you choose, your Windows never goes to sleep. If you put it to sleep manually (through the menu or clicking on hardware sleep button) it sleeps; but eventually it wakes up.I have stopped using it (replaced with RME Digiface USB, which is way more expensive though), and the sleep issues went away right after I disconnected it.So, the bottom line, the lack of sync is expected for this price range. But preventing PC going to sleep is some serious issue. So, two stars.

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