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Sound Specifications

The frequency response of the sound circuits, not including the microphone and speakers, is within plus or minus 1 dB from 20 Hz to 20 kHz.

Total harmonic distortion plus noise (THD+N) as a percentage of full scale are shown in Table 3-6 .

Table 3-6   Distortion specifications

Connector and level

THD+N

Line input 0.03%
Line output, open circuit 0.03%
Headphone jack, open circuit 0.03%
Headphone jack, 32-ohm headphones 0.5%

The signal-to-noise ratios (SNR) for various inputs and outputs are shown in Table 3-7 . The values shown are unweighted; values with A weighting would be about 8 dB higher.

Table 3-7   SNR specifications

Connector

Signal-to-noise ratio

Microphone 65 dB
Line output 85 dB
Headphone jacks 85 dB
Line input 85 dB
Internal CD or DVD 85 dB


© 2000 Apple Computer, Inc. – (Last Updated 01 Aug 00)