Have you ever heard of Stoner Acoustics? You haven't? Well, I haven't either before 2012 when they were mentioned in a German audio community I was active in at that time. 2012 is also the year they were founded. If you are wondering about the slightly inappropriately seeming name - according to the company's information, the founder of the Malaysian company wasn't aware of the slang meaning of "Stoner" when he registered his company that was originally meant to be named "Stone Acoustics", representing the steady and calm nature of a stone or rock, however as "Stoner Acoustics" sounded phonetically nicer, this is the name he finally went for. While there were thoughts about eventually renaming the company, they had already built up some reputation, so for now the name will remain - and you gotta admit that it is quite catchy, isn't it? Photo ©opyright: "HiFiChris". Having started with a small blog and offering a simple and case-less USB DAC chip in the beginning, they eventually evolved into a proper company with a full website and more complex products, one of them being the UD125, a USB DAC that is using AKM's AK4490 DAC chip, along with a Texas Instruments TPA6120 amplification chip. According to its product site, its output power is rated at 350 mW per channel with a line output capable of outputting 4.88 V (RMS) and four selectable digital filters. The DAC is priced at USD85. I have a copy of the UD125 with me and can report that it is a very nice USB DAC if you are looking for an affordable option that has got a very low output impedance (I measured and calculated it to be just tiny 0.1 Ohms), along with a really precise volume control (256 steps with a linear step size of 0.5 dB each). It definitely is an interesting device, and impressions as well as discussions are highly appreciated and welcome in this thread.