Frequently Asked Questions

Bi-directional, will it work in both ways?

  • USB is always bi-directional.

  • USB defines Host and Device or in terms of direction upstream (communications from device to host) and downstream (communication from host to device.

  • The host is always on the upstream side and has a type A socket (or OTG) the device is always downstream and originally devices were all supposed to be fitted with type B sockets or a type A plug (memorystick etc.). A Host (mostly a PC, or android on OTG) is the controlling device and an ADC or DAC is a Device.

Example: iPurifier 1 or 2 plugs into the type B socket on an ADC device and the cable from the computer plugs into the iPurifier 1 or 2, exactly as would be the case with a DAC.


As long as the iPurifier 2 plugs into a "B" type socket (or via an adapter into a "A" Plug - e.g. iDSD micro) it works in the right "direction".

A DAC, ADC, USB Disk Drive, USB Printer (not that we claim it improves print quality) all are devices and thus to the iPurifier 2 look the same.

Please Wait!

Please wait... it will take a second!