PDA

View Full Version : New USB Converter from Taiwan



Ammonite Audio
05-10-2013, 20:54
On a bit of a whim, I recently ordered a cheap USB to S/PDIF converter from that well-known auction site. It is well-specified and keenly priced: see http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=300980603403 . The main reason for trying this device is that my resident HiFace Evo converter is incompatible with the SOtM audiophile USB card in my audio PC. That SOtM card elevates the humble Arcam RPac from "quite good for the price" to "really very good by any standard" so is well worth exploiting.

The new converter arrived with the predicted tax bill and is very nicely built and finished. It's so nice to have a piece of equipment that does not have a separate PSU - this one has an inbuilt PSU with a standard mains IEC plug at the back. Connectivity goes way beyond what I need, eg just coaxial and optical. Installation of the drivers in win7 was hassle-free and I was quickly up and running with the thing hooked up to the Lyngdorf amp via MIT Shotgun RCA lead and to the Bushmaster (for headphones) with a Lifatec glass optical cable. I selected the device in JRiver and sat back, to be greeted with a rather unimpressive sound. Going back into the JRiver settings, changing from WASAPI Event Style to ASIO (which the HiFace did not support), an immediate transformation occurred; indeed the sound reproduction became vibrant, organic, spacious, detailed, musical. It's only gotten better with time.

The rather shocking realisation for me is that the HiFace Evo was clearly not in good health, and this resulted in my pointing an accusing finger at the Bushmaster for a rather coarse and gritty sound, which characteristic was not so apparent via the Lyngdorf amp, but which in retrospect was clearly there too. Now, via the new USB converter, the BM is sounding quite wonderful, and so is the rest of the system too. I am a bit puzzled about why ASIO should be so dramatically better than WASAPI, but it is and I'm happy with the result!

So, a very good result for very little expenditure. That the Bushmaster has finally revealed its capabilities to me is a great bonus, since I was looking at alternative USB headphone amps (the new Musical Fidelity V90-HPA is shockingly good even without knowing how cheap it is).

And my apologies are due to Stanley Beresford for doubting the Bushmaster's capabilities.

sq225917
06-10-2013, 07:06
Shuggie, the most likely answer to this is that the Hiface's spdif output was at fault. it uses an unusually high voltage level, above the spdif spec. I'd assume that was overloading the input on the Bushmaster.

Ammonite Audio
06-10-2013, 07:42
On optical?

StanleyB
06-10-2013, 08:42
The problem is mentioned at http://www.tweekgeek.com/audio-components/computer-audio/m2tech-hiface/

The BM2 uses an input level re-clocking circuit to try to solve the technical issue of different voltage output levels from different types of adapters and source equipment. So it is a lot more resilient to this kind of overload condition.

Optical can be anything up to 5V, whilst coax is around 0.6V. That's a good 8 to 1 ratio, which is also capable enough to introduce jitter into the signal at a critical stage.