Can I attach my iPhone 3GS to my Mac Pro so that the iPhone's audio plays through the Mac Pro's speakers?
I can easily attach my Bose headphones so that the music from the iPhone plays through them… that's cool… but I want others to hear the music through my Mac Pro's speaker system.
Best Answer
Simple, and simply surprising:
Plug in your iPhone to your Mac using your Lightning Cable (doesn't work with 30 pin iPhones, sorry. [Yes I know you said 3GS])
Launch QuickTime Player
Choose File> New Audio Recording
Click the hard-to-see down arrow next to the Record 'button', choose iPhone under 'Microphone'
Play your music, game whatever on your iPhone, sound will come thru your Mac.
No need to hit record, the sound will play even if you don't record. Just turn up the volume.
Note: for those who want a louder volume, go to the system preferences on your Mac. Then go to the sound settings and you can increase the output volume so it is louder.