"arfi-optical" Audio Interface:

A designated music server only makes sense compared to a standard computer if the audio interface is well designed. The worst connection to a DA-converter is usually the direct USB connection. High-frequency interferences thus find a direct way into the most sensitive audio device, the DA-converter.

In order to ensure the compatibility of our mu-se with converters from other manufacturers, the device also offers conventional connection. However, with the connection via the arfi-optical interface we have found the technically perfect solution to avoid high-frequency interference on the converter section. Here, the connection of the devices is made exclusively via three optical fibres. The music server receives the reference clock from the DA-converter via one optical fibre and sends back the audio data synchronized to it via the second optical fibre. The sound-relevant clocking, however, takes place only within the DA converter. Thus, it generates the analog audio signal exclusively based on the internally generated clock. The clock from the music server has no sonic influence. There is no possibility of feedback via jitter generated by the music server.  The third optical fibre only provides the switching signal for switching the oscillators for 44.1 or 48 kHz multiples.

This way, the music server is a pure “data supplier” and only the DA-converter determines the timing and thus the sound. This is exactly how it should be!

The following graphic illustrates once more the functionality of our arfi-optical audio interface compared to a conventional connection: