ENGLISH
OPERATION MANUAL
JB SYSTEMS®
3/41
MM-10
FUNCTIONS
MONO MICROPHONE/LINE INPUT CHANNEL
1. 3 PIN FEMALE XLR SOCKET INPUT
Balanced input wiring: Pin 1 = Ground (sleeve)
Pin 2 = Positive signal
Pin 3 = Negative signal
Unbalanced input wiring:
Pin 1 = Ground
Pin 2 = Signal
Pin 3 = Ground
Input impedance: 2k Ohm
Input sensitivity: 0.8mV RMS (-60dB)
2.
1/4" STEREO JACK SOCKET INPUT
Balanced input wiring:
Tip = Positive signal
Ring = Negative signal
Sleeve = Ground
Unbalanced input wiring:
Tip = Signal
Ring = Ground
Sleeve = Ground
(Mono jack plug will automatically give this)
Input impedance: >50K Ohm
Input sensitivity: 25mV RMS (-30dB)
3. GAIN CONTROL
Allows maximum input signal control and will accommodate most
microphones of both low or high impedance to 600 Ohm as well as
Phantom Power (48 Volt) types. The line input can be anything
from keyboard through to line level feeds from other equipment.
Gain range:
XLR input +15 to +60dB
Jack input –15 to +30dB
4. CLIP LED
This warning will illuminate 4dB before clipping and will remain on
for a short period. For optimal input channel running level, adjust
Gain Control until Clip indicator illuminates while signal peaks are
present. Then
adjust the gain setting until Clip indicator is off. This will give
optimal signal to noise.
5. EQ CONTROL ‘HIGH’
This control allows 16dB of cut or boost to the high frequencies.
6. EQ CONTROL ‘MID’
This control allows 16dB of cut or boost to the mid frequencies.
7. EQ CONTROL ‘LOW’
This control allows 16dB of cut or boost to the low frequencies.
8. AUX SEND 1
This auxiliary send control is ‘Post-fade’ and can be used to control
the mix of inputs being processed by effects, etc. Its level will
change with the channel fader (12).
9. AUX SEND 2
This auxiliary send control is ‘Pre-fade’ and can be used to control
the mix of inputs to an independent output such as monitoring. Its
level will not change with channel fader (12).
Note: the Post-Fade option can only be selected by your service engineer.
10. PAN CONTROL
This control is used to set the stereo balance of the input signal and can ‘Pan’ it fully to the left or
right.
ENGLISH
OPERATION MANUAL
JB SYSTEMS®
4/41
MM-10
11. PFL SWITCH
This switch and indicator allows pre-fade listen of input signals through the headphone and Led
meters (useful while setting gains or trouble shooting).
12. 60mm FADER
This slide control provides level control of input signal to the main stereo mix output and will also
control the Post-Fade Aux Send 1.
STEREO LINE INPUT CHANNEL
1. LINE INPUT LEFT OR MONO – 1/4" Mono Jack Socket
If the input is connected to a mono source use this connection
only as the signal will automatically be routed to the right input also.
Input wiring:
Tip = Signal Sleeve = Ground
Input impedance: 10K Ohm
Input sensitivity: 24.5mV (-30dBm)
2. LINE INPUT RIGHT – 1/4" Mono Jacket Socket
Input wiring:
Tip = Signal Sleeve = Ground
Input impedance: 10K Ohm
Input sensitivity: 24.5mV (-30dBm)
3. PAD SWITCH
Operation of this switch reduces the input sensitivity by 10Db allowing
it to be used with high output devices such as CD players as well as
musical instruments.
4. GAIN CONTROL
The panel marking at 0dB is a true reference to 0dBm when the –10dB
Pad is engaged.
Range: +10dB
5. CLIP LED
This warning light will illuminate 4dB before clipping and will remain on
for a short period. For optimal input channel running level, adjust Gain
Control until Clip indicator illuminates while signal peaks are present.
Then adjust the gain setting until Clip indicator is off. This will give
optimal signal to noise.
Note: If EQ controls are altered this Gain/Clip setting will need
adjustment.
6. EQ CONTROL ‘HIGH’
This control allows 16dB of cut or boost to the high frequency content
of the input signal.
7. EQ CONTROL ‘MID’
This control allows 6dB of cut or boost to the mid frequencies.
8. EQ CONTROL ‘LOW’
This control allows 6dB of cut or boost to the low frequencies.
9. AUX SEND 1
This auxiliary send control is ‘Post-fade’ and can be used to control the
mix of inputs being processed by effects, etc.
Its level will change with the input fader (13).
10. AUX SEND 2
This auxiliary send control is ‘Pre-fade’ and can be used to control the
mix of inputs to an independent output such as monitoring. Its level will
NOT change with input fader.
Note: The Post-fade option can only be selected by your service
engineer.
11. BALANCE CONTROL
This control is used to set the stereo balance of the input signal and
can pan it fully to the left or right.
12. PFL SWITCH
This switch and indicator allows pre-fade listen of input signals through
the headphone and Led meters (useful while setting gains or trouble
shooting).
