Appendix C - Performance Specification; Audio Performance; Puredrive™ Channel Input Microphone/Line Amplifier; Monitor Input Line Input Amplifier - Solid State Logic ORIGIN User Manual

Appendix C - Performance Specification

Audio Performance

Default test conditions (unless otherwise stated):
Source impedance of Test Set: 40 Ω
-
Input impedance of Test Set: 200 kΩ
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Reference frequency: 1 kHz
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Reference level: 0 dBu where 0 dBu = 0.775 V into any load
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Unless specified, all unweighted measurements are specified as 22 Hz to 22 kHz band limited RMS and are expressed in
-
units of dBu
The onset of clipping (for headroom measurements) should be taken as 1% THD
-
All distortion measurements are specified with a 36dB/Octave low pass filter at 20 kHz and are expressed as a percentage
-
All levels are intended balanced
-
Unless otherwise quoted all figures have a tolerance of ±0.5 dB or 5%.
PureDrive™ Channel Input Microphone/Line Amplifier
Measurement
Gain
Input Impedance
Max Input Level
Output Headroom
Frequency Response
THD+Noise
CMRR
Equivalent Input Noise (EIN)

Monitor Input Line Input Amplifier

Measurement
Gain
Input Impedance
Hi-Z Input Impedance
Max Input Level
Output Headroom
Frequency Response
THD+Noise
CMRR
Equivalent Input Noise (EIN)
ORIGIN User Guide
Conditions
**dependent on potentiometer tolerances
1% THD
20 Hz to 20 kHz
-
-3 dB high rolloff
-
(-10 dBu applied, +30 dB gain) @ 1 kHz
(filter 22 Hz to 80 kHz)
(-10 dBu applied, +30 dB gain)
Mic Amp, 150 Ω termination, maximum gain
Conditions
**dependent on potentiometer tolerances
1% THD
20 Hz to 20 kHz
-
-3 dB high rolloff
-
(-10 dBu applied, +20 dB gain) @ 1 kHz
(filter 22 Hz to 80 kHz)
150Ω termination, maximum gain
Value
Mic Amp Gain Variable from +2 dB to +70 dB**
Line Amp Gain Variable from -12 dB to +55 dB**
1.4 kΩ
Mic Amp : +21 dBu
>+26.5 dBu at onset of clipping
+0/-0.2 dB
-
> 90 kHz
-
<0.004% at 1 kHz
-
<0.018% at 10 kHz
-
> 57.5 dB 20 Hz to 20 kHz
-
<-127.5 dBu (A-weighted)
-
Value
Variable from -20 dB to +20 dB**
10 kΩ
1 MΩ
>+28 dBu before clipping
>+27.5 dBu at onset of clipping
+0/-0.03 dB
> 156 kHz
<0.0003% at 1 kHz
<0.0009% at 10 kHz
> 65dB 20 Hz to 20 kHz
<-104 dBu
Appendix C
41