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Raimund Heubel posted a topic in DAC - Digital to Analog ConversionThe Artistic Fidelity Isolator plus USB-Module is probably the most enhanced and thought through USB interface I have yet come across, for sure it is for me the most revealing and sounding of such devices! This DDC strictly speaking consists of two devices: the external USB-Module (powered by the computer's USB port) and the Afi itself (powered by an external PSU). My Mac mini is connected via a short USB cable to the external USB-Module, the module is connected via three 2 meter long (!) fibre optical cables (FOCs) to the Afi which outputs the re-clocked digital audio signal via an RJ45-to-AES/EBU adapter cable to my T+A DAC8. The reason for this set-up is: a) Isolation from the computer source The one of the three fibre optical cables carrying the audio stream from the USB-Module towards the Afi has no direct electrical pathway for High Frequency (HF) noise from the computer. The USB-Module and the Afi itself are completely galvanic isolated from the computer. b) Re-Clocking The 2nd FOC from the Afi towards the USB-Module contains the new clock signal generated by high precision oscillators in the Afi - completely independant from the computer. The 3rd FOC from the Afi towards the USB-Module transmits the switching signal for each of the sampling rate family multipliers either 44.1 or 48 kHz based. The Afi itself outputs the re-clocked audio signal in the RJ45 Ethercon format hence requires an adapter cable to connect to my T+A DAC via AES/EBU port. The sonic result of this set-up is simply stunning, instruments and voices sound much more natural and organic than ever before in my set-up when having connected the mini via 2 Jitterbugs and 1 Regen Amber to the DAC8' s USB port. Yes, there is much more black and quiet background, instruments and voices can be much better separated and followed during a song. They sound as if I am in a Live performance in my living room! No artefacts, not the slightest sign of steril digital sound anymore but a much more analog presentation from a digital music source..., what a dream coming true! I am sorry for my emotions and enthusiasm here but I think I have found the ultimate USB interface for my set-up. It costs €1.220 = $1.365 incl. adapter cable - for sure not cheap - but it is in my opinion worth every €/$. More detailed information can be obtained from the German Manufacturer's website under http://www.artistic-fidelity.de