14
TEST PROCEDURES
Note: The Booster/Equalizer should be
operated and tested using a 100 Ohm load
for each of the speaker outputs until the
unit functions properly. Center the bass
control and Spatial Control™.
1. Initial Turn-On Test
1.1 Connect the speaker to 100 Ohm loads
and connect the power harness to a power
supply at 13.8 Vdc.
1.2 Turn on the power supply and check
the current draw. If the unit is drawing more
than 250 mV shut off the power supply and
check the outputs for shorts.
Note: On the 1401 II and the 1201 if the
unit shuts off and than tries to turn on
approximately every 3 seconds the outputs
could be shorted.
1.3 Apply a 125 mV 1 kHz signal to the low
level inputs and adjust the Spatial Control
to electronically center (the front and rear
output should be the same amplitude).
2. Low Frequency Response Test
2.1 Apply a 35 mV 1 kHz signal to the low
level inputs.
2.2 Reference a dB meter to the output of
the Booster/Equalizer.
2.3 Apply a 35 mV 100 Hz signal and slide
the low frequency control to the minus (-)
side. There should be a -6.5 dB ±1 dB
decrease in output.
2.4 Center the control. Reference a dB
meter to the output of the Booster/Equal-
izer.
2.5 Slide the control to the plus (+) side.
There should be a +6.5 dB ±1 dB increase
in output.
3. Spatial Control, High Frequency, and
Rear Switch Control Test
3.1 Apply a 35 mV 15 kHz signal to the low
level inputs.
3.2 Reference a dB meter to the output of
the Booster/Equalizer.
3.3 Slide the spatial control to maximum
right (front speakers). There should be a +1
dB ±1 dB increase in output and a -30 dB
cut to the rear speakers.
3.4 Slide the spatial control to maximum
left (rear speakers). There should be a +1
dB ±1 dB increase in output and a -30 dB
cut to the front speakers.
3.5 Center the spatial control and switch
the rear high frequency switch to position I.
The rear output should be -10.5 dB ±1 dB
from the front output.
3.6 Return the rear high frequency switch
to position II.
4. Power and Distortion Test
Note: Refer to the diagram on page 14 for
the schematic diagram of the .45 Ohm
load.
4.1 Connect the speaker outputs to .45
Ohm loads.
4.2 Apply a 1 kHz signal to the low level
inputs and increase the input until the
output signal just begins to clip. The
output reading should be approximately
3.36 Volts.
4.3 Decrease the applied signal until the
output reads 3.20 Volts. The distortion
should be .09% for all four channels.
Note: The length and size of the wiring
and the connection to the load is very
important. Make sure the connections are
as tight as possible to achieve correct
distortion readings.
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