45Quick Start Guide
Audio Performance Speci cations
Frequency Response
Input Output Gain 20 Hz 20 kHz
Surface I/O Surface I/O 0 dB 0 dB to -1.0 dB 0 dB to -1.0 dB
Surface I/O Surface I/O 40 dB 0 dB to -1.0 dB 0 dB to -1.0 dB
Gain Error at 1 kHz
Input Output Gain Max. Min.
Surface I/O 251 I/O Box 0 dB +1.0 dB -1.0 dB
Surface I/O 251 I/O Box 40 dB +1.0 dB -1.0 dB
Input CMRR (Typical)
Input Output Gain 100 Hz 1 kHz
Surface I/O Surface I/O 0 dB 60 dB 60 dB
Surface I/O Surface I/O 40 dB 90 dB 90 dB
Distortion at 0 dBu
Input Output Gain 1 kHz 10 kHz
Surface I/O Surface I/O 0 dB 0.01% 0.01%
Surface I/O Surface I/O 40 dB 0.03% 0.03%
Distortion at +20 dBu
Input Output Gain 1 kHz 10 kHz
Surface I/O Surface I/O 0 dB 0.01% 0.01%
Surface I/O Surface I/O 40 dB 0.03% 0.03%
Mixing Noise (all bus types) 22-22 kHz Unweighted
No. of Inputs Gain Fader Pos Pan Output Noise
12 0 dB - in n central -91 dBu
12 0 dB 0 dB central -78 dBu
24 0 dB - in n central -91 dBu
24 0 dB 0 dB central -78 dBu
Mixing Noise (all bus types) 22-22 kHz Unweighted
48 0 dB - in n central -91 dBu
48 0 dB 0 dB central -78 dBu
Signal Path Noise 22-22 kHz Unweighted (inputs 150 R terminated)
Input Output Gain Output Noise EIN
Surface I/O Surface I/O 0 dB -85 dBu -85 dBu
Surface I/O Surface I/O 45 dB -81 dBu -126 dBu
Dynamic Range 22-22 kHz Unweighted
Input Output Gain Max Output Dynamic Range
Surface I/O Surface I/O 0 dB +21 dBu 106 dB
Surface I/O Surface I/O 45 dB +21 dBu 102 dB
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