Headphone Jack

The Power Mac G4 has a 3.5 mm mini jack for stereo sound output on the back of the enclosure. The headphone jack is suitable for connecting a pair of headphones or amplified external speakers. When a plug is inserted into the headphone jack, the internal speakers and the Apple speakers are muted.

The sound output through the headphone jack has the following electrical characteristics:

• output level 2.0 V peak-to-peak (0.7 V RMS)
• impedance suitable for driving standard 32-ohm headphones
• signal-to-noise (SNR) 90 dB unweighted (typical)
• total harmonic distortion (THD) 0.03% or less