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Guided Tour - Rear Panel
8: Bus Insert - Use these to insert an external in-line effects processor (such as out-
board equalizer, compressor/limiter or noise gate) into the Bus 3/4 output in an “effects
loop” configuration. These jacks accept 1/4" TRS plugs, with the ring carrying the send
signal and the tip carrying the return signal. Normally, this will be connected to a
Y-cable; see the “Connecting The MPL 1640” section on page 10 for more information
and a wiring diagram.
9: Aux Outs - These unbalanced 1/4" outputs allow you to route signal from each of the
three discrete Aux sends to external devices such as effects processors. Aux send 1 is
pre-fader and pre-EQ, while Aux sends 2 and 3 are post-fader and post-EQ. See the
“Using the Auxiliary Sends and Returns” section on page 20 for more information.
10: Aux Returns - These unbalanced 1/4" inputs allow you to route signal from exter-
nal devices such as effects processors to any of the three stereo Aux Returns. See the
“Using the Auxiliary Sends and Returns” section on page 20 for more information.
11: Channel Inserts (1 - 12) - Use these to insert external in-line effects processors
(such as outboard equalizers, compressor/limiters or noise gates) into channels 1 - 12 in
an “effects loop” configuration. These jacks accept 1/4” TRS plugs, with the ring
carrying the send signal and the tip carrying the return signal. Normally, this will be
connected to a Y-cable; see the “Connecting The MPL 1640” section on page 10 for
more information and a wiring diagram.
12: Line Inputs (1 - 16) - Use these standard balanced 1/4" jacks to connect line-level
sources such as synthesizers, drum machines, CD players, tape decks, or effects
processors to any of the MPL 1640’s input channels. All channel line input jacks are
electronically balanced, so you should use balanced three-conductor cabling and plugs
wherever possible (unbalanced two-conductor plugs can also be inserted into these
inputs, but you’ll get better signal quality and less outside noise and hum if you use
balanced lines). See the “Connecting The MPL 1640” section on page 10 for more
information. WARNING: Do not connect a channel’s line input if you already have
something connected to its mic input; each channel is designed to accept only
one or the other.
13: XLR Mic Inputs (1 - 10) - Use these standard XLR jacks to connect microphones to
any of the MPL 1640’s first ten channels (channels 1 - 10). These are intended to
accept signal from low-level, low-impedance mics but can also be used for signal from
other sources (such as direct injection boxes) if the channel’s Trim control is turned
down. WARNING: Do not turn Phantom power on if signal sources other than
microphones are connected to any of these inputs. Also, do not connect a chan-
nel’s mic input if you already have something connected to its line input; each
channel is designed to accept only one or the other.
14: 1/4" Mic Inputs (11 - 16) - Use these standard balanced 1/4" jacks to connect
microphones to any of the MPL 1640’s last six channels (channels 11 - 16). These are
intended to accept signal from low-level, low-impedance mics but can also be used for
signal from other sources (such as direct injection boxes) if the channel’s Trim control is
turned down. WARNING: Do not connect a channel’s mic input if you already have
something connected to its line input; each channel is designed to accept only
one or the other.
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