Mackie ONYX 4Bus Appendix C: Technical Info, Onyx 4•Bus Specifications, Crosstalk, ONYX 4•Bus, Noise Floor, Equalization, Dynamic Range, Phantom Power, Input Impedance

4•Bus

Appendix C: Technical Info

ONYX

Onyx 4•Bus SpecificationsFrequency 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

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 kΩ balanced
Stereo Returns:	20 kΩ balanced
Talkback Mic:	1 kΩ balanced

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
30	Low:	±15 dB @ 80 Hz
	ONYX 4•Bus

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