Appendices
33
THE BUS+ User Guide
D-EQ
Default test conditions (unless otherwise stated):
Source impedance of test set: 40 ohm
Input impedance of test set: 100 kOhm
Reference frequency: 1 kHz
Reference level: 0 dBu
All unweighted measurements are specified as 20 Hz to 20 kHz bandwidth limited, expressed in dBu
Onset of clipping (for headroom measurements) should be taken as 1% THD
Measurements taken with default input trim setting (0 dB)
All levels are intended balanced
Mode set to Classic Stereo
D-EQ modules bypassed
Mix pot set fully dry
LPF disabled
LF/HF Gain pot set to center
LF/HF pots set to center
LF maximum frequency
HF minimum frequency
Unless otherwise quoted all figures have a tolerance of ±0.5dB or 5%.
Audio Performance
Measurement Value Conditions
Frequency Response (20 Hz - 20 kHz) ±0.05 dB
< 2 Hz
> 200 kHz
LF In, 20 Hz to 20 kHz
LF In, -3 dB low cut-off
LF In, -3 dB high cut-off
±0.05 dB
< 2 Hz
> 200 kHz
HF In, 20 Hz to 20 kHz
HF In, -3 dB low cut-off
HF In, -3 dB high cut-off
THD+N -88 dB / 0.004% typical
-81 dB / 0.008% typical
LF In, 40 Hz @ 0 dBu
HF In, 10 kHz @ 0 dBu, 40 kHz BW
Headroom > 27 dB LF In, HF In
Noise -90 dBu typical
-87 dBu typical
LF In
HF In
LF Gain Accuracy
HF Gain Accuracy
±0.05 dB typical
±0.05 dB typical
LF In, 40 Hz @ 0 dBu: -10 dB to +10 dB
HF In, 10 kHz @ 0 dBu: -10 dB to +10 dB
Stereo Matching < 0.05 dB
< 0.1 dB
< 0.1 dB
LF/HF In, 20 Hz to 20 kHz @ 0 dBu
LF In, 40 Hz, any gain change
HF In, 10 kHz, any gain change
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