Apple MB871LL User Manual - Page 103

Power Supply, Power Requirements for Expansion Cards and Peripherals

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 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 mVrms sine wave, 44.1 kHz input sample rate, 24-bit sampling, unless otherwise specified below.  Maximum input voltage: 39 mVrms (-26 dBu)  Input impedance: Greater than 1 kilohm  Signal-to-noise ratio: Greater than 60 dB  Total harmonic distortion + noise: Less than -60 dB (0.1 percent)  Frequency response: 100 Hz to 8.2 kHz, +0.5 dB/-3 dB Power Supply AC line input  Voltage ranges: 100-240 V alternating current (AC)  Current: Maximum of 12 A (low voltage range) or 6 A (high voltage range)  Frequency: 50-60 Hz single phase Power Requirements for Expansion Cards and Peripherals Expansion cards Combined maximum power consumption for all four PCI Express slots should not exceed 300 watts (W). USB devices Each of the computer's built-in USB ports is allotted 500 mA. Chapter 5 What's Under the Hood 103

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Chapter 5
What’s Under the Hood
103
Â
Signal-to-noise ratio:
Greater than 90 dB
Â
Total harmonic distortion + noise:
Less than -85 dB (.006 percent)
Â
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.
Â
Maximum input voltage:
39 mV
rms
(-26 dBu)
Â
Input impedance:
Greater than 1 kilohm
Â
Signal-to-noise ratio:
Greater than 60 dB
Â
Total harmonic distortion + noise:
Less than -60 dB (0.1 percent)
Â
Frequency response:
100 Hz to 8.2 kHz, +0.5 dB/-3 dB
Power Supply
AC line input
Â
Voltage ranges:
100–240 V alternating current (AC)
Â
Current:
Maximum of 12 A (low voltage range) or 6 A (high voltage range)
Â
Frequency:
50–60 Hz single phase
Power Requirements for Expansion Cards and Peripherals
Expansion cards
Combined maximum power consumption for all four PCI Express slots should not
exceed 300 watts (W).
USB devices
Each of the computer’s built-in USB ports is allotted 500 mA.