Q: Wanting to connect an older G4 Powerbook running OS 10.4.11 to a Marantz SR4023 receiver amplifier with only RCA inputs to play iTunes through it on stereo speakers. Can anyone advise how to do this?

Hi,

There were many PowerBook G4 models (http://support.apple.com/kb/HT3065) with different ports (http://support.apple.com/kb/ht2369).

If necessary, a manual can be found here:

http://support.apple.com/manuals/#PowerBook%20G4

Generally speaking, the output of a headphone port can often be used for the connection to an amplifier. You would need an appropriate cable (typically, 3.5 mm stereo plug to two RCA plugs). Choose a suitable amplifier input (high level). Do verify the allowed amplifier input voltage levels and the impedance before you connect.

Jan

This product should be able to achieve what you want as it has switchable line and mic level inputs/outputs and is a soundcard in its own right...

https://store.griffintechnology.com/imic