Lexicon MPX 1 - Manual (Page 16)

1-5
Product Overview
Unbalanced (-10) Balanced (+4)
overload: > +8dBu >+20dBu
acceptable: 8dBu to -14dBu +20dBu to -2dBu
too low (noisy): <-14dBu <-2dBu
Overload
The Clip (overload) indicators will light under the following conditions:
• Analog-to-Digital (A/D) overload
• overload at any point in effects processing within .1dB of maximum
• input level within .1dB of maximum
For example, internal peaking of high Q filters, or level buildup from certain
reverberation modes can result in overload, even when the input A/D or digital
receiver data stream is not at full scale. Such conditions are most often caused
by a combination of extreme parameter settings. Adjusting parameter/level
settings can eliminate these overload conditions.
Digital input level is adjustable from the Dig In Lvl screen of the Audio menu in
System mode. Level can be set to Off, -89dB to +6db to optimize noise and
avoid overload.
Headroom Display
The headroom display provides both headroom and overload information from
a variety of measurement points.
The information on the headroom display is selectable from the Meters Assign
menu in Edit mode and the assignment made here is saved as a part of each
program. The available assignments are:
Inputs
Outputs
InLevel, OutLevel or In&OutLevel for all effect blocks. (when In&Out is
selected, the left side of the headroom display will display InLevel and
the right side of the headroom display will display OutLevel.)
LFO 1 and LFO 2 (Left and right sides of the display)
Envelope 1 and Envelope 2 (Left and right sides of the display)
Footpedal
ADR 1 and ADR 2 (Left and right sides of the display)
Simulation display (for test purposes)
Rear Panel Input Level Switch
The chart below illustrates the adjustment range that will set input levels for both
balanced and unbalanced operation.When a choice can be made, it is best to
operate at the higher amplitude end of the recommended range to optimize
noise performance.