16 channel version, with 16 mono inputs, Stereo Mix and Mono Sum Outputs and 6 Aux Outputs. - Total Inputs to Mix: 22
12.2 channel version, with 12 mono inputs and 2 stereo inputs, 1 Stereo Sub Group Output, Mix and Mono Sum Outputs, and 6 Aux Outputs - Total Inputs to Mix: 26 (when Mics used on stereo input)
Rotatable connector pod for top or rear cable entry
8 (GB2R-16) or 10 (GB2R-12.2) busses
2 full feature stereo inputs (GB2R-12.2 version)
GB30 Mic preamp and precision EQ on inputs
Switchable +48V phantom power on every mic input
100Hz Hi-pass filter
Direct outputs on every channel
100mm faders
Stereo Mix Output and separate Mono Sum output
Record output
Internal Universal switched mode PSU
Specificications
Frequency Response
Mic/Line Input to any output, 20Hz - 20kHz: <1dB
THD + N
Mic sens. -30dBu, +10dBu at all outputs @1kHz: <0.006%
Noise
Measured RMS, 22Hz to 22kHz Bandwidth Mic E.I.N. @ unity gain,150Ohm source impedance: -128dBu
Mix Output, 16 inputs routed to mix: <-86dBu
Group & Centre Outputs: <-86dBu
Aux Outputs: <-86dBu
Crosstalk (@1kHz, typical)
Input Channel Mute: <-97dB
Input Fader cut-off: <-95dB
Pan isolation: <-77dB
Mix route isolation: <-97dB
Group route isolation: <-97dB
Adjacent channel crosstalk: <-99dB
Group to Mix: <-89dB
Aux Send pots offness (typical): <-84dB
CMRR
Typical @ 1kHz: 90dB
Input & Output Max Levels
Mono & Stereo Mic Inputs: +15dBu
Mono & Stereo Line Inputs: +30dBu
Stereo Returns & Insert Returns: +20dBu
Any output: +20dBu
Nominal Operating Level: 0dBu
Headphone Power: 2 x 250mW into 200Ohms
Input & Output Impedances
Mic Inputs: 2kOhms
Line Inputs and Stereo Returns: 10kOhms
Input channels Insert Return: 5kOhms with EQ in, otherwise 3kOhms
Mix, Group, Aux, Matrix & Direct outputs: 150Ohms
Insert sends: 75Ohms
Recommended Headphone Impedance: 50-600Ohms
EQ (Mono input)
High pass filter (Mono input): 100Hz, 18dB/octave
HF: 13kHz, +/-15dB, 2nd order shelving
Hi-Mid: 550Hz-13kHz, +/-15dB, Q=1.5
Lo-Mid: 80Hz-1.9kHz, +/-15dB, Q=1.5
LF: 80Hz, +/-15dB, 2nd order shelving
Metering
Input channels: Single LEDs, Signal Present & Peak
Outputs: 2 tri-colour 12-segment LED bargraphs
Power
AC mains supply (internal PSU): 90V-240V AC, 50/60Hz universal input