Lexicon MPX G2 - Manual (Page 24)

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Product Overview
The MPX G2 is a complete guitar processing system. As such it has two
independent audio paths: one for effects that go directly between the guitar and
the input to the amp (pre-gain path), the other for effects that are inserted in the
amp’s effects loop (post-gain path). Analog Dynamic Gain effects (Tone,
Crunch, Screamer, Distortion, and Preamp) are dedicated to the pre-gain path.
The other 70 effects can be placed anywhere on either path and each one of
the 300 MPX G2 programs can have its own unique combination of effects,
distributed on either path.
When different pieces of audio gear are connected together, care must be taken
to avoid ground loops (which can cause noise and hum problems). The MPX G2
uses a special grounding scheme to safely minimize grounding-related prob-
lems. All circuits are internally connected to a common ground plane. (This is the
same approach used to ground racks of gear in studio installations and touring
rigs.) The chassis is isolated from the printed circuit board to prevent ground
loops through the ground pin of the AC cord. No special cables are required
when connecting the MPX G2 to other equipment.
Note that the G2 must always be properly grounded via the ground pin in its AC
line cord.
With the exception of the Main Outputs and the stereo Headphone connectors,
all of the 1/4" connectors are unbalanced mono jacks. For best performance use
high-quality, shielded instrument cables.
The MPX G2 has two high impedance guitar inputs: one on the front panel and
another on the rear panel. Connecting to the front panel input will override a
connection made at the rear panel input.
For best performance, maintain balanced connections, and use high-quality,
low-capacitance, shielded twisted-pair cable. Use shielded instrument cables
for unbalanced connections.
When connecting the MPX G2 XLR outputs to single-ended, unbalanced
devices, leave the low side floating and connect the grounds between the
units.
Dual Audio Paths
Internal Grounding
Unbalanced
Connections
Guitar Input
Main Outputs