Instruction Manual

The Technical Stuff
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Output Level Meters Calibration
Having completed the output trim procedure as described on the previous page, the output meters will
need to be recalibrated. (Note that the input trims have no effect on the meters, so no calibration is
needed after input trims are adjusted.) The factory default has the unit set so that a 0dBFS digital
level equals an analog level of +22dB.
Note that the clip indicator (top LED) is not part of metering circuit. It is controlled by the processor,
and is illuminated when a digital clip occurs. It is hard wired in the unit and cannot be adjusted.
To calibrate the output level meters, a digital signal generator and an accurate analog dB level meter
with balanced inputs are required, as well as a small non-conductive plastic or nylon Phillips
screwdriver.
Output level meters calibration procedure:
1. With the unit powered down, remove the AC line cord.
2. Place the unit on a flat, stable area and remove top cover.
3. Attach the AC line cord and power up the unit.
4. Connect the digital tone generator to the digital input of the 2192.
5. Set the digital generator to output a 1kHz sine wave at -18dB.
6. Adjust the left channel output meter using Output Meter Trim A* (see Figure 4 on the next
page) so that the -18dB segment for the left channel meter just lights up.
7. Adjust the right channel output meter using Output Meter Trim B* (see Figure 4 on the next
page) so that the -18dB segment for the right channel meter just lights up.
The output meters are now calibrated.
* Component reference designation numbers may vary from those shown in the illustration on the
following page.
 Important: Because there are potentially dangerous voltages present inside the unit, as
well as sensitive electronic components, meter calibration should be performed by qualified
service personnel only. Use extreme caution!
!