Ideally use Naim Headline headphone amplifier which has a captive signal lead (normally Din but can be ordered with RCA) to connect to a Line out or Tape out on a Naim preamplifier/Integrated product. You will also need a power supply such as NAPSC FLATCAP or HICAP. If you wish to use the Headline with a Naim CD player you will need to use an adapter lead as the Din pin configuration is different on a CD player.