PowerBook G4 (12-inch): Sound Specifications
The PowerBook G4 (12-inch) and PowerBook G4 (12-inch DVI) has an audio line-in port, headphone-out port, integrated microphone, two stereo speakers, and a midrange-enhancing speaker.
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-out port also uses a 3.5 mm mini-phono jack and provides enough current to power a set of low-impedance headphones. Headphones, external speakers, or other sound output devices that may require external power, may also be used with the headphone-out port.
The integrated microphone is located on the left side of the keyboard, above the F1 key.
Figure 1 Location of integrated microphone
The PowerBook G4 (12-inch) and PowerBook G4 (12-inch DVI) computer comes with two stereo speakers. The speakers are located along the computer's back panel
Figure 2 Location of stereo speakers
When the display is open, the sound from these speakers reflects off the display to project the sound forward.
Figure 3 Sound reflection off the display
The PowerBook G4 (12-inch) and PowerBook G4 (12-inch DVI) computer also has a midrange-enhancing speaker. This speaker is designed to produce a separate channel of midrange sound. The midrange speaker is located underneath the F6 and F7 keys. There are no settings in the Sound pane of the System Preferences to adjust just the midrange speaker. Instead, increasing and decreasing the volume changes both the stereo speakers and the midrange speaker at the same time.