The PowerBook G4 (17-inch) and PowerBook G4 (17-inch 1.33GHz) computers have an audio line-in port, headphone port, and an integrated microphone.
The audio line-in port is a stereo 3.5 mm mini-phono jack that allows the connection of a line-level microphone or other audio equipment.
The headphone port also uses a 3.5 mm mini-phono jack and provides enough current to drive a pair of low-impedance headphones. It can support external speakers (which may require external power) or other sound output devices.
The integrated microphone is located underneath the left speaker grill near the Tab key.
The computer includes two stereo speakers located beneath the speaker grills.