API 2500 Manual page 9

Metering and Trim Section
7 5
10
20
10
20
G/R
VU METER:
The VU Meters displays the INPUT and OUTPUT levels in dBu, where +4dBu is
O VU. This reference point can be adjusted internally to other reference levels.
The GAIN scale shows the amount of gain reduction during compression, with
the 0 point being all the way to the right, allowing more resolution of the gain
reduction scale. The range of the meter is from 0 (no gain reduction) to 20 db of
gain reduction. The compressor can compress up to 30 dB of reduction.
VU:
The VU switch selects the INPUT, OUTPUT or GAIN REDUCTION to be displayed
on the VU meters. It is a silent function and is isolated so the VU selection does
not effect or load the signal in any way.
TILT:
The TILT adjustment is a trim of the compression control voltage, allowing tilting
of the compression left or right to equalize uneven signal compression that may
offset the stereo image. This control adjusts about 2 dB in either direction, and
DOES NOT affect the uncompressed signal, which is always unity in to out.
This control is useful in a situation where there is a slight difference in the stereo
image when a signal is compressed, but not when it is below the compression
threshold. Normally, this control should be straight up.
WARNING: Adjusting this control will likely require your unit to be returned to
the API factory to be re-calibrated!!
When in doubt, start with all the controls straight up...
3 2 1 0
1
VU
2
10
3
20
6
4
2
0
20
G/R
3 2 1 0
7 5
1
VU
2
3
6
4
2
10
0
VU
GR
OUT
2dB
IN
L R
L/R tilt
source
METER