PAGE 10
GLOSSARY OF TERMS
BALANCED
A 3-conductor (including shield), low-impedance connection.
Balanced cables are the preferred method for hum-free
intercon¬nection of a sound system for their noise-rejection
characteristics. (Also see Unbalanced.)
BUS
An output destination in a mixer. For example, the left and right
main outputs are called busses, because you can send a channel
to one or both of them. Also spelled Bus.
CHANNEL
One of any number of signal paths in an audio circuit, such as
input channel, output channel, recording channel, left channel,
right channel, etc.
DELAY
Like an echo, this effect duplicates the original signal, then plays it
back at a rate you control. The rate at which these repeats occur
is the “delay time.”
EQUALIZATION
Electronic filters that adjust the level of certain frequencies. Used
for tone enhancement or to reduce extraneous sounds. Two
types of EQ shapes are Peak and Shelving, described below.
IMPEDANCE
Resistance in an electrical circuit measured in Ohms (
Ω
).
Maintaining proper impedance (between amplifier and speakers
for example) is important to prevent damage to the amp.
PEAK EQUALIZER CONTROL
Increase or decrease of a frequency range centered at a specific
point, resulting in an EQ curve that looks like a hill (increase) or a
valley (decrease).
PHANTOM POWER
A voltage signal that runs through a microphone cable to power
condenser microphones. Harmless to microphones that don't
need it, except for very old and/or damaged ribbon microphones.
REVERB
An audio effect that emulates the echo reflections and decay time
of a large space.
SHELVING EQUALIZER CONTROL
Increase or decrease of all frequencies above or below a specific
point. (Compare to Peak Equalizer Control; see pages 8-9 for
more information.)
TRS
Acronym for Tip-Ring-Sleeve — the three parts of a three-
conductor (including shield) audio plug. TRS phone plugs are often
used for “balanced” mono connections, or stereo "unbalanced"
(head¬phone) connections.
TS
Acronym for Tip-Sleeve, the two parts of an unbalanced,
two-conductor (including shield) phone plug. TS connectors are
some¬times called mono or unbalanced plugs or jacks.
UNBALANCED
A two-conductor (including shield), high-impedance connection.
These are most commonly used for instrument connections and
cable runs of less than 20 feet.
XLR
The three-pin connector universally used for balanced audio
connections. A balanced connection reduces outside noise and
interference. (See Balanced above.)
BLOCK DIAGRAM
USER MANUAL - LMD1402FX AUDIO MIXER
PHANTOM
MIC IN
+48 VDC
LINE IN
LINE IN LEFT (MONO)
LINE IN RIGHT
PEAK
PEAK
MONO CHANNELS
1 through 8
GAIN
EQ
75Hz
HI PASS
HIGH
MID
80
12K
2.5K
LOW
+4
–10
PAN
LEVEL
LEVEL
AUX2/FX
MAIN MIX
STEREO CHANNELS
9/10 and 11/12
L
L
R
R
PAN
L
R
AUX SEND
HEADPHONE
OUTPUT
LEFT
RIGHT
TAPE TO CTRL RM/
PHONES
AUX2 TO
CTRL RM
TAPE TO MIX
CONTROL
ROOM/
PHONES
LEFT MAIN
MIX OUT
RIGHT MAIN
MIX OUT
LEFT
CONTROL
ROOM
OUTPUTS
RIGHT
CD/TAPE OUT
LEFT
RIGHT
CD/TAPE IN
AUX2/FX
METER
LEFT MAIN BUS
RIGHT MAIN BUS
AUX2/FX (POST) BUS
VARI
FX SEL
FX RTN
DSP EFFECTS
AUX1 (PRE) BUS
AUX1
AUX1
USB
CODEC
USB
ROUTING
Summary of Contents for LMD-1402FX
Page 1: ...RevA 10 2015...
