JB Systems MM 14D Manual De Instrucciones página 4

ENGLISH
 When installed in a booth or flight case, please make sure to have good ventilation to improve heat
evacuation of the unit.
 To avoid condensation to be formed inside, allow the unit to adapt to the surrounding temperatures when
bringing it into a warm room after transport. Condense sometimes prevents the unit from working at full
performance.
CLEANING THE APPLIANCE:
Clean by wiping with a polished cloth slightly dipped with water. Avoid getting water inside the unit. Do not
use volatile liquids such as benzene or thinner which will damage the unit.
CONNECTIONS
For more information on connections, please refer to the next chapter.
Be sure to turn off the mixer before you make changes to the different connections.
In this manual we talk about "line inputs". This is a global name for inputs with a level between 750mV and
2V. This includes tuners, videos, CD-players, etc.
FUNCTIONS
INPUT CHANNELS
1. COMBO INPUT:
 MICROPHONE INPUT = 3 PIN FEMALE XLR CONNECTOR
 MONO LINE INPUT = 1/4" JACK SOCKET
2. 1/4" JACK SOCKET LINE INPUTS
3. INSERT
Allows you to insert an external effect (like compressor, noise
gate, equaliser, etc) that you will only use for this channel.
Wiring ¼" Stereo Jack socket:
4. LOW CUT FILTER Switch
When this button is lit, the frequencies below 75Hz for this channel will be filtered. This can be
usefull for example to avoid 'popping' of microphones or stage rumble.
5. STEREO / MONO SWITCH
When this button is lit, the mono function is activated; the Left input signal will be send to the Left
and Right channel
JB SYSTEMS
®
OPERATION MANUAL
3/44 MM-14D
ENGLISH
6. 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.
7. 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
8. EQ CONTROL 'HIGH'
Allows 15dB cut/boost for the high frequencies (15kHz)
9. EQ CONTROL 'MID'
Allows 15dB cut/boost for the mid frequencies (2,5kHz)
10. EQ CONTROL 'LOW'
Allows 15dB cut/boost for the low frequencies (65Hz)
11. AUX SEND 1 (Post-Fade)
This auxiliary send control is 'Post-fade' and is mainly used
to send the signal of the channel to the internal effect
module. When the AUX1/FX send (11) is used, the internal
effect unit is switched off. The AUX1 send level changes with
the position of the channel fader (17).
12. AUX SEND 2 (Pre-Fade or Post-Fade)
This knob is used to send the audio signal of this channel to
the AUX 2 SEND output. It can be switched pre or post
fader. See next point (13) for more information
13. PRE-FADE / POST-FADE SWITCH for AUX SEND 2
 Button is lit: AUX2 for this channel is switched PRE-
FADE. The level is only influenced by the Gain control (7)
and not by the channel fader (17). Use this setting for
example when AUX2 is used to control stage monitors.
 Button is not lit: AUX2 for this channel is switched
POST-FADE. The level is also influenced by the position
of the channel fader (17). Use this setting for example
when AUX2 is used for external effect equipment.
14. PAN / BAL CONTROL
 Pan control: also called "panoramic control" is used on
the mono input channels to position the mono microphone
somewhere left or right in the stereo output.
 Balance control: is used to set the stereo balance of the
stereo input channels.
15. PFL SWITCH
Also called "Pre Fade Listening" is used to monitor the input
channel on the headphone while the channel fader is closed.
16. CHANNEL ON / OFF BUTTON
This button is very usefull if you want to cut the output of an
input channel without changing the settings and levels.
Switching off unused channels increases the signal/noise
ratio of the mixer.
 ON button is lit: The channel is switched on
 ON button is not lit: the channel is switched off
17. 60mm FADER
Controls the output signal of the corresponding input
channel.
JB SYSTEMS
®
OPERATION MANUAL
4/44 MM-14D