USB Isolation

USB DACs can sound amazing when the signal is RF isolated enroute to the DAC. Here's what I recommend:

STANDARD USB ISOLATION

1. USB•FILTER (with USB-A Adapters). Even a well designed source component with low RF noise USB will also benefit from additional USB filtering. USB-FILTER is an all-passive design with excellent RF/EMI line noise suppression on +5V/GND power and common/differential mode noise suppression on D+/D- data lines. 
2. USB•CABLE. Use your existing well shielded/filtered USB cable or consider my own offering. Keep this cable as short as possible to avoid antenna effects.

EXTREME USB ISOLATION

1. USB•FILTER (with USB-A Adapters). Even a well designed source component with low RF noise USB will also benefit from additional USB filtering. USB-FILTER is an all-passive design with excellent RF/EMI line noise suppression on +5V/GND power and common/differential mode noise suppression on D+/D- data lines. Note that for EXTREME ISOLATION, I recommend two USB•FILTER: one at the source and one at the output of OPTO•USB.
2. OPTO•USB. The best isolation technology is optical and OPTO•USB is compatible with the vast majority of DACs. Note that OPTO•USB receiver requires ultra-low-noise 5V for optical demodulation to USB.
3. USB•CABLE. Use your existing well shielded/filtered USB cable or consider my own offering. Keep this cable as short as possible to avoid antenna effects. Note: due to Cyan2's proprietary USB receiver design, OPTO•USB and other (active) optical USB cables are not compatible.