API 2500 - Page 9

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.
Metering and Trim Section
When in doubt, start with all the controls straight up...
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!!
L
R
source
GR
METER
OUT
IN
VU
L/R tilt
2dB
1
2
3
+
0
2
4
6
10
20
20
10
7
5
3
2
1
0
-
VU
G/R
1
2
3
+
0
2
4
6
10
20
20
10
7
5
3
2
1
0
-
VU
G/R