SoundCraft GB4 manual Typical Specifications

TYPICAL SPECIFICATIONS

Noise
Measured RMS, 22Hz to 22kHz Bandwidth
Mic E.I.N. @ unity gain,150Ω source impedance	-128dBu
Mix Output, 40 inputs routed to mix	<-82dBu
Group Outputs	<-83dBu
Aux Outputs	<-80dBu
Matrix Outputs	<-89dBu
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
Matrix Send pots offness (typical)	<-89dB
Frequency Response
Mic/Line Input to any output, 20Hz - 20kHz	<1dB
THD + N
Mic sens. -30dBu, +20dBu at all outputs @1kHz	<0.006%
CMRR
Typical @ 1kHz	80dB
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	2x250mW into 200Ω
Input & Output Impedances	2kΩ
Mic Inputs
Line Inputs and Stereo Returns	10kΩ
Input channels Insert Return	5kΩ with EQ in, otherwise 3kΩ
Mix, Group, Aux, Matrix & Direct outputs	150Ω
Insert sends	75Ω
Recommended Headphone Impedance	50 - 600Ω

GB4 User Guide 35