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Setting up your MPL 1640 is a simple procedure which takes only a few minutes:
1. Remove all packing materials (save them in case of need for future service)
and decide where the unit is to be physically placed—it can be used on a
tabletop or mounted in any standard 19” rack, requiring 8 rack spaces.
2. Before even plugging the unit into an AC socket, begin by connecting the
MPL 1640 Main Mix outputs (or secondary 3L/4R outputs) into a switched-
off power amp and the amp into loudspeakers. It is never a good idea to
power up any amplifier that is not connected to loudspeakers.
3. Next, make all signal connections to the mic or line inputs of the various
channels and to the MPL 1640’s Aux sends and returns and insert points as
required. WARNING: Do not connect a channel’s line input if you already
have something connected to its microphone input, or vice versa; each
channel is designed to accept only one source or the other.
4. Bring all channel faders and the Main L/R faders completely down (to their
“-∞” setting) and turn the 3/4 Level knob fully counterclockwise (to its
“-∞” setting). Then connect the EEC main power cord and plug the MPL
1640 into any grounded AC socket.
5. Press the MPL 1640’s rear-panel Power switch. Once power is received,
the “Power” LED in the meter section will light up.
Setting the Correct Gain Structure
You’re now ready to establish the correct gain structure—the key to getting the
best performance from the MPL 1640, or from any mixer, for that matter. This is
a simple procedure that ensures optimum input and output levels so that no
unnecessary noise (caused by too low a signal) or overload distortion (caused by
too high a signal) is created. Here’s a step-by-step description of how to do so:
a Turn off the MPL 1640 and all connected power amplifiers. Set all power
amplifier volumes to minimum. On the MPL 1640, bring all channel faders
down to the bottom-most “-∞” position, and set both Main L/R faders to their
center detent “0” position. If any devices are connected to the secondary
3L/4R outputs, turn the 3/4 Level knob fully counterclockwise (to its “-∞”
setting).
b. Set all channel input trim knobs to their fully counterclockwise (+4) position.
c. Set all channel equalizer and pan knobs as well as all three Aux return
balance knobs to their center detent “0” positions.
d. Set all channel Aux send knobs and all three stereo Aux return level knobs
to their fully counterclockwise (“-∞”) position.
e. Turn on all devices connected to channel line inputs and Aux returns and
set their output level controls to unity gain or, if there is no unity gain indi-
cated on their output control, to maximum. If you’ve got outboard effects
processors connected to MPL 1640 Aux returns, make sure they are send-
ing completely “wet” (processed) signal, with no “dry” (unprocessed) signal
mixed in.
Setting Up and Using the MPL 1640
MAIN MIX OUT
(BALANCED 600Ω + 4dB)
L
R
SERVO - 240
SAMSON
115
ON
OFF
P
O
W
E
R