Appendix C: Technical Information

Specifications

Noise Characteristics:

Equivalent Input Noise (EIN), mic input at insert, 150 Ω source impedance, 20 to 20 kHz:

60 dB (max) gain:

-127 dBu

40 dB gain:

-126.5 dBu

Equivalent Input Noise (EIN), mic input at insert, 50 Ω source impedance, A-weighted:

60 dB (max) gain:

-130.5 dBu

40 dB gain:

-130 dBu

Output Noise Figure (1/4" Main out, all channels assigned to main, Gain knobs at unity, 20 Hz to 30 kHz):

Main Mix knob down, channel Level knobs down:

-102 dBu (-106 dB SNR, ref +4 dBu)

Main Mix knob unity, channel Level knobs down:

-96 dBu (-100 dB SNR, ref +4 dBu)

Main Mix knob unity, channel Level knobs unity:

-93 dBu (-97 dB SNR, ref +4 dBu)

FireWire Through (Record + Playback) Dynamic Range:

0 dBu mic input, to DAW, routed back to mixer direct to Control Room, all gain stages unity, 20 Hz to 20 kHz:

44.1 kHz sample rate:

-104 dB

96 kHz sample rate:

-106.5 dB

Distortion (THD+N):

20 Hz to 20 kHz, 20 Hz to 80 kHz bandwidth

Mic input at insert

(+4 dBu in, 0 dB gain, +4 dBu out): 0.0015%

Mic input at insert

(-36 dBu in, +40 dB gain, +4 dBu out):0.017%

Stereo channel line input to any output

(+4 dBu in, all gain stages at unity +4 dBu out): 0.005%

FireWire in and out (+4 dBu in, mic input to FireWire send, returned to Control Room, all gain stages at unity):

44.1 kHz sample rate:0.01%, 20 Hz to 2 kHz 0.02%, 2 kHz to 20 kHz

96 kHz sample rate:

0.01%,

10 Hz to 1 kHz

 

0.03%,

1 kHz to 47 kHz

Attenuation and Crosstalk:

@ 1 kHz relative to 0 dBu

Main Mix knob down:

-85 dBu

Channel Alt/Mute switch engaged:

-95 dBu

Channel Level knob down:

-95 dBu

Common Mode Rejection Ratio (CMRR):

Mic input to insert, max gain, 1 kHz, 150 ohm termination: -70 dB

Frequency Response:

Mic input to any output (all gain stages at unity): +0/-0.5 dB,

20 Hz to 20 kHz

Stereo channel line input to any output (all gain stages unity): +0/-0.5 dB,

20 Hz to 20 kHz

FireWire in and out (mic input to FireWire send, returned to Control Room, all gain stages at unity):

44.1 kHz sample rate:+/-0.5 dB,

20 Hz to 20 kHz -3 dB at 21 kHz

96 kHz sample rate:

+/-0.5 dB,

 

20 Hz to 20 kHz

 

-3 dB at 45 kHz

Maximum Input Levels:

Mic input, gain at min (0 dB):

+22 dBu

Mic input, gain at max (60 dB):

–38 dBu

Line input, gain at -20 dB:

+22 dBu

Instrument input, gain at -20 dB:

+22 dBu

Tape input:

+12 dBu

Aux return:

+22 dBu

Maximum Output Levels:

All outputs:+22 dBu

Equalization

Mono Channels

Low:

±15 dB at 80 Hz

Mid frequency:

100 Hz to 8 kHz

Mid gain:

±15 dB

High:

±15 dB at 12 kHz

Stereo Channels:

 

Low:

±15 dB at 80 Hz

Mid:

±15 dB at 2.5 kHz

High:

±15 dB at 12 kHz

30Onyx 1220i