You can use an USB sound card like the Audigy2 from Creative Technology. But I am not sure if it works on Mac. My guess is it will but you should check with Creative to make sure.
Trying to find a USB to RCA adapter.
I'm trying to use my laptop to copy lp's onto CD's. My space is confined and instead of finding space for my desktop next to my stereo, I would like to use my laptop. I'm looking for an adapter that would allow me to take the audio from my preamp into my laptop. I only have USB or Firewire inputs on my Mac. Any suggestions