may interfere with the product’s internal circuit components.
APU750: HF Panel adjustable output
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The APU750 features internal jumper
switches to allow the installer to adjust
the output level of the HF
(high-frequency) panel relative to the
LF (low-frequency) panel. The factory
supplied setting is “0dB”. Please read
the following if these settings need to be
changed.
The APU750 is a low voltage, passive
device, however ALWAYS disconnect it
from all speakers and amplifiers before
adjusting the internal jumpers (ensure
all equipment is turned off at this point).
The HF panel can be adjusted to suit
personal taste or to allow for minor
variations in frequency response as a
result of uneven plaster thickness. Use
of a sound pressure level meter will help
accurately achieve evenly matched
speakers.
Set the jumpers as follows depending
on the required output level in the
frequency range 500Hz - 20KHz:
0dB - set jumper to 0dB
+2dB - set jumper to +2dB
-2dB - set jumper to -2dB
WARNING:
No more than one jumper should be used per bank of 3 pins
