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The sound system for the Power Mac G4 supports 44.1 kHz 16-bit stereo sound output and input, available simultaneously.
Like other Macintosh computers, the sound circuitry and system software can create sounds digitally and either play the sounds through speaker inside the enclosure or send the sound signals out through the sound output jack. The computer also records sound data from several sources: a PlainTalk microphone, a stereo sound source connected to the line-level sound input jack, or single-channel sound signals from the modem card in the internal modem slot. With each sound input source, sound playthrough can be enabled or disabled.
In addition to the signal sources connected to the sound system, the computer also accepts digital sound data from the DVD drive and from devices connected to the USB and FireWire ports. Sound data from those sources can be sent to the sound system to be converted to analog form for output to the speakers and the output jack.