MACKIE U.40d - Manual (Page 11)

11
Owner’s Manual
Owner’
s Manual
Rear Panel Features
1. MIC/LINE Input
These Neutrik “combo” input connectors for channels
1 and 2 accept either balanced male XLR connectors, or
1/4" TRS balanced or TS unbalanced connectors.
• If you are using a microphone, use the XLR
input. (Professional mics usually have XLR con-
nectors, while consumer or semi-pro mics often
have 1/4" connectors.)
• If you are connecting line-level sources such as
CD or MP3 players, use the 1/4" input.
Input 1 can also accept direct instrument-level signals
such as from guitars, without the need for a DI box. For
this to work, use the 1/4" input, and press channel 1’s
instrument switch [11].
Channel 1 and 2 are mono, and the signals are equally
split to the left and right of the main mix bus.
If your microphone is a condenser design, it probably
requires phantom power to operate. Push in the 48V
switch [32] to supply 48 VDC to pins 2 and 3 of both
XLR microphone connectors. Do not use phantom power
with ribbon microphones.
2. LINE Inputs
Channel 3 and 4 have stereo line-level inputs that
accept either 1/4" TRS balanced or TS unbalanced con-
nectors.
You can connect stereo line-level sources such as CD
players, MP3 players, keyboards, drum machines, tape
players, and all manner of line-level goodies. You may
need to purchase some adapters from RCA to 1/4" mono,
depending upon your source component. These adapters
are readily available at your local music or electronics
store.
These are stereo inputs; the left signals appear on the
left main mix bus, and the right signals appear on the
right main mix bus.
If you have a turntable with a phono-level output, use
the phono RCA inputs [3] instead.
3. PHONO Inputs
These RCA jacks for channels 3 and 4 accept stereo
phono-level signals from turntables. Check that your
turntable has a phono-level output and a moving-mag-
net cartridge. Turntables usually have a ground wire
that needs to be connected to the ground terminal [4].
The turntable’s stereo phono-level signals are re-
equalized and converted to line-level by the fine RIAA
preamplifiers inside the mixer.
The phono inputs are internally disconnected
if anything is plugged into the same channel’s
line inputs.
Do not connect line-level sources to these
inputs, because the phono preamplifiers will
be overloaded. Use the line-level inputs [2]
instead.
4. GND Terminal
This terminal is provided to connect a ground wire
from your turntable(s) to the mixer. Most turntables
provide a ground wire for the purpose of eliminating
hum in the audio signal.
Rotate this terminal counter-clockwise to loosen it,
wrap the end of the turntable’s ground wire clockwise
around the terminal, and hand-tighten the terminal for
a secure ground connection.
GND
PHONO PHONO
LINE LINE MIC/LINE MIC/LINE
1 2 3 4
R
L
R
L
R
L
R
L OUT
MAIN
OUT
AUX
(MONO)
R
L
POWER
18V,1.5A