Lexicon MPX 550 manual Front Panel Display, Input Level Meters, Input/OVL Indicator

Getting Started

Lexicon

FRONT PANEL DISPLAY

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1.Input Level Meters

Indicate incoming signal levels. Input level meters show a minimum when the incoming signal is more than -48dB digital full-scale. Level meters appear in inverse video when the signal approaches overload (-2dB digital full-scale). When signals are between these extremes, the level meters appear as shown above.

Input level meters show calibrated values, with 0dB indicating digital saturation. Markings on the open portion of each level meter show -6, -18, and -32dB. The meters have single-pixel precision in which each pixel represents 2dB.

S/PDIF digital input sources that have been mastered “hot” (at the maximum bit rate) will cause the input level meters to peak as if digital full-scale is occurring. However, the unit is just receiving the maximum output from the source, which is loud enough to peak the meters. This is not a problem as long as the source audio is not distorted.

Gain reduction from the compressor is indicated by a descending bar situated between the two input level meters. It is also calibrated in 2dB increments per pixel.

2.Input/OVL Indicator

Reflects the input type in normal operation. The first letter indicates input type, which is selected with the System Mode parameter Input Source (see page 3-4).

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