Apple MA970LL User Manual - Page 92
Analog Audio Specifications, Analog audio out using the headphone jack typical values
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Analog Audio Specifications  Sample rate: 44.1 kHz, 48 kHz, or 96 kHz  Jack type: 1/8" mini  Bits per sample: 16-bit or 24-bit  Frequency response: 20 Hz to 20 kHz, +0.5 dB/-3 dB Analog audio out using the headphone jack (typical values) Based on a typical situation with playback of 1 kHz, -3dBFS 24-bit sine wave, 44.1 kHz output sample rate into 150 ohms unless otherwise specified below.  Output voltage: 1.4 volts (root mean square) (Vrms) (+5.1 dBu)  Output impedance: 24 ohms  Output power: 90 milliwatts (mW)  Signal-to-noise ratio: Greater than 90 dB  Total harmonic distortion + noise: Less than -75 dB (.02 percent)  Channel separation: Greater than 50 dB Analog audio line in (typical values) Based on a typical situation with playback of 1 kHz, -3dBFS 24-bit sine wave, 44.1 kHz output sample rate unless otherwise specified below.  Maximum input voltage: 2 Vrms (+8.2 dBu)  Input impedance: Greater than 20 kilohms  Signal-to-noise ratio: Greater than 90 dB  Total harmonic distortion + noise: Less than -85 dB (.006 percent)  Channel separation: Greater than 80 dB 92 Chapter 5 What's Under the Hood