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ONYX 4•Bus
ONYX 4•Bus
Appendix C: Technical Info
Onyx 4•Bus Specifications
Frequency Response
Mic Input to Main Output (Gain @ Unity)
+0, –1 dB, <10 Hz to 80 kHz
+0, –3 dB, <10 Hz to 120 kHz
Distortion (THD & IMD)
Mic Input to Main Output (@ +4 dBu)
THD: < 0.007% 20 Hz to 20 kHz
0.003% @ 1kHz typical
SMPTE IMD: < 0.005% (7 kHz/60 Hz, 4:1)
Dynamic Range
>115 dB, Mic In to Main Out
Noise Floor
Signal-to-Noise Ratio:
–87 dBu (ref. +4 dBu, Mic In to Main Out,
32 channels and Main Mix levels at unity)
–89 dBu, (ref. +4 dBu, Mic In to Main Out,
24 channels and Main Mix levels at unity)
Equivalent Input Noise (E.I.N.), 20 Hz to 20 kHz Bandwidth,
150Ω source impedance
–129.5 dBu @ +60 dB gain
Mic Output Noise:
Direct Output: –100 dBu (minimum gain)
Residual Output Noise:
Main Out: –100 dBu (Channel and Main Mix levels off)
Main Out:
32•4: –83 dBu (32 channels and Main Mix
levels at unity)
24•4: –85 dBu (24 channels and Main Mix
levels at unity)
Common Mode Rejection Ratio (CMRR)
Mic In: >70 dB @ 1 kHz, Gain @ maximum
Crosstalk
Adjacent Inputs: < –95 dB @ 1 kHz
Input to Output: < –85 dB @ 1 kHz
Input Gain Control Range
Mic In: 0 dB to +60 dB
Line In: –20 dB to + 40 dB, mono channels
Phantom Power
+48 VDC
Equalization
Mono Channel EQ:
High: ±15 dB @ 12 kHz
High Mid:
±15 dB, sweepable from 400 Hz to 8 kHz
Low Mid:
±15 dB, sweepable from 100 Hz to 2 kHz
Low: ±15 dB @ 80 Hz
Stereo Channel (Aux Input) EQ:
High: ±15 dB @ 12 kHz
High Mid:
±15 dB @ 2.5 kHz
Low Mid:
±15 dB @ 400 Hz
Low: ±15 dB @ 80 Hz
Mixer Rated Output
Main Outs: +4 dBu
Aux Send: +4 dBu
Group Send: +4 dBu
Monitor Out: +4 dBu
Matrix Out: +4 dBu
Maximum Rated Output:
+21 dBu @ Main XLR and TRS outputs
Maximum Input Levels
Mic Input: +21 dBu, Gain @ unity, pad out
Mic Input: +30 dBu, Gain @ unity, pad in
Line Input: +21 dBu, Gain @ –20 dB
Tape Input: +30 dBu
Stereo Return: +21 dBu
Maximum Voltage Gain
Mic Input to:
Main Out: 90 dB
Group Out: 80 dB
Aux Sends: 86 dB
Monitor Out: 103 dB
Matrix Out: 105 dB
Phones Out: 103 dB
Line Input to:
Main Out: 70 dB
Group Out: 60 dB
Aux Sends: 66 dB
Monitor Out: 83 dB
Matrix Out: 85 dB
Phones Out: 83 dB
Stereo Return to:
Main Out: 53 dB
Group Out: 43 dB
Aux Sends: 49 dB
Monitor Out: 66 dB
Matrix Out: 68 dB
Phones Out: 66 dB
Input Impedance
Mic Input: 3 kΩ, balanced
Mono Channel Line Input: 34 k
Ω balanced
Stereo Returns: 20 k
Ω balanced
Talkback Mic: 1 k
Ω balanced
Output Impedance
Main Out: 100 Ω balanced, XLR outputs;
300
Ω TRS outputs
Direct Out: 300
Ω
Group Out: 300
Ω
Monitor Out: 300
Ω
Matrix Out: 300
Ω
Aux Sends: 300
Ω
Phones Out: 25
Ω