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Auxiliary
No. of Channels:.................................................................2
Sensitivity (master full): ............................................260mV
Signal to Noise Ratio:.................................better than 76dB
Frequency Response (±3dB): .........................60Hz - 20kHz
Input Impedance:.................................................100k Ohm
Muting Level:...............................................................-50dB
Mode:..................................................................Unbalanced
Connector Type:..................................................Stereo RCA
Tone Controls
Bass Control: ..................................................±9dB at 80Hz
Treble Control:............................................±10dB at 10kHz
Bass Cut Switch on Microphone
Switch "ON":..................................-6dB/Octave from 150Hz
Phantom Power
Voltage:...........................................................................12V
Output Impedance:................................................3.4k ohm
XLR Mic
Input
Shield
2
1
Balanced
3
Signal
XLR Mic
Input
Shield
1
2
Unbalanced
3
Signal
XLR Line
Output
Output
Balanced
1
2
3
XLR Line
Output
Output
2
Unbalanced
1
3
Fault/Symptom: No Sound
• Check that there is power on both the mixer and power amplifier.
The mixer has a LED light to indicate if there is power.
• Check master volume is turned up.
• Check the fuse. CAUTION: Unplug the mixer from mains power
before checking fuse.
• Check all lead connections
Fault/Symptom: When Paging the Music is Not Muted
• Set the VOX Muting internal jumper to "ON".
Input
From Microphone
Input
From Microphone
XLR Amp
Input
2
1
3
RCA
Signal
Shield
For Stereo
Amplifiers
Trouble Shooting
Microphone
No. of Channels:.................................................................6
Sensitivity (master full): .............................................1.2mV
Signal to Noise Ratio:.................................better than 71dB
Frequency Response (±3dB): .......................60Hz to 20kHz
Input Impedance: ..................................................600 Ohm
Mic Impedance:...............................200 - 600 Ohm nominal
Mode:......................................................................Balanced
Connector Type:........................................3 Pin XLR Female
Output
Signal to Noise Ratio :
(all controls mid way) ..............................-85dB, ref 0dBm
(all controls maximum)............................-58dB, ref 0dBm
Impedance: ..........................................................600 Ohms
Distortion:....................................................Less than 0.06%
Max Output Level:...................................................+19dBm
Mode:......................................................................Balanced
Connector Type:............................................3 Pin XLR Male
*Specifications subject to change without notice.
Figure 2.
Connection Details
Microphone Connections
Connector Type:..................XLR 3Pin Female
Pin 1: .....................................................Earth
Pin 2:...............................Signal Inphase (hot)
Pin 3:......................Signal Out of Phase (cold)
Shield
Output Connections
Connector Type: .....................XLR 3Pin Male
Pin 1: .....................................................Earth
Pin 2:...............................Signal Inphase (hot)
Pin 3:......................Signal Out of Phase (cold)
RCA
Fault/Symptom: Bass Control Fails to Give Bass Boost
• Check that the Bass Cut internal jumper is selected "OFF"
Fault/Symptom: Microphone Does Not Work
• The microphone may need phantom power. If so set the Phantom
Power internal jumper(s) to "ON".
• Check microphone volume is turned up.
Fault/Symptom: Tone Controls Do Not Work on Mic
• Set the Tone Routing internal jumper to "TONE" setting.
REDBACK A 4420A Mixer
Page 3
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