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Appendix C – Performance Specification
Conditions:
Source impedance 150Ω unless otherwise stated.
All measurements are RMS and are made using a 22Hz to 22kHz filter unless otherwise stated.
General
Gain: Continuously variable from +18dB to +72dB with switchable 20dB pad
Input Impedance: >1200Ω switchable to 8200Ω
Noise
Input terminated with 150Ω
Equivalent input noise:
Gain EIN
70dB –129dBu
50dB –129dBu
40dB –128dBu
30dB –127.5dBu
18dB –120dBu
Frequency Response
Measured reference level at 1kHz. Source impedance 50Ω.
Minimum Gain Maximum Gain
20Hz to 20kHz ±0.1dB ±0.1dB
10Hz to 96kHz ±0.2dB +0.2/–0.75dB
10Hz to 200kHz +0.2/–1dB +0.2/–6dB
Common Mode Rejection Ratio (CMRR)
At minimum gain (+18dB), input level +6dBu, ground referenced:
Frequency CMRR (dB)
20Hz to 1kHz > 75dB
10kHz > 60dB
At maximum gain (+72dB), input level –45dBu, ground referenced:
Frequency CMRR (dB)
20Hz to 1kHz > 85dB
10kHz > 75dB
XLogic Mic Amp Owner’s Manual
Page 24