What is the fine-grained topic of the following text: Whether a DAC, streamer, computer, CD Player, NAS, router, phono stage, preamplifier, amplifier, etc – if it has a spare input or output connector (RCA, XLR, spade, USB or Ethernet) then you can plug in the GC1 Ground Control into your system. Only return the topic.
Using GC1 Ground Control in Audio Equipment