Apple Mac Pro (Mid 2010) - Manual (Page 111)

111 Chapter 5 What’s Under the Hood
Analog audio line in (typical values)
Based on a typical situation with playback of a 1 kHz, -3 dBFS 24-bit sine wave, 44.1 kHz
output sample rate, unless otherwise specified below.
 Maximum input voltage: 2 V
rms
(+8.2 dBu)
 Input impedance: Greater than 17 kilohms
 Signal-to-noise ratio: Greater than 90 dB
 Total harmonic distortion + noise: Less than -85 dB (.006 percent)
 Channel separation: Greater than 85 dB
Analog audio line out (typical values)
Based on a typical situation with playback of a 1 kHz, -3 dBFS 24-bit sine wave, 44.1 kHz
output sample rate into 100 kilohms, unless otherwise specified below.
 Output voltage: 2 V
rms
(+8.2 dBu)
 Output impedance: 33 ohms
 Signal-to-noise ratio: Greater than 90 dB
 Total harmonic distortion + noise: Less than -85 dB (.006 percent)
 Channel separation: Greater than 85 dB
External microphone input using the headphone jack (typical values)
Based on a typical situation with playback of a 1 kHz, 28 mV
rms
sine wave, 44.1 kHz input
sample rate, 24-bit sampling, unless otherwise specified below.
 Maximum input voltage: 39 mV
rms
(-26 dBu)
 Input impedance: Greater than 1 kilohm
 Signal-to-noise ratio: Greater than 60 dB