13
TEST PROCEDURES
3. Loudness Control Procedure
Note: Use the following control settings.
Slide pots centered, speaker A switch
selected with the output connected to an 8
ohm load, all switches out except for the
aux switch.
3.1 Apply a 100Hz signal at 1Volt to the
aux input.
3.2 Rotate the volume control until 1.5
Vrms is measured at the output.
3.3 Reference a dB meter to the output.
3.4 Push the loudness switch IN. There
should be a +8dB change in response at
the output.
3.5 Change the signal to 12kHz and repeat
step 3.3 and 3.4. There should be a + 6dB
change in response at the output.
4. Low Filter Procedure
4.1 Perform procedure 3.1, 3.2, and 3.3.
4.2 Push the low filter switch IN. There
should be a -3dB change in response at the
output.
4.3 Change the input frequency to 20Hz
and reference a dB meter to the output.
4.4 Push the low filter switch IN. There
should be a -7dB change in response at the
output.
5. Low Frequency Control Procedure
5.1 Apply a 140Hz signal at 1Volt to the
aux input.
5.2 Rotate the volume control until 1.5
Vrms is measured at the output.
5.4 Slide the control from one side to the
other. There should be a + 8dB and -8dB
change in response ( ±1dB) from the
center.
5.5 Push the wide/narrow switch IN.
Change the frequency to 350Hz. With the
low frequency control centered reference a
dB meter to the output.
5.6 Slide the control from side to side.
There should be a +3dB and -3dB change
in response (±1dB) from the center.
6. High Frequency Procedure
6.1 Apply a 15kHz signal at 1Volt to the
aux input.
6.2 Reference a dB meter to the output.
6.3 Slide the high frequency control from
side to side. There should be a +8dB and
-8dB change in response (±1dB) at the
output.
6.4 Change the input signal to 2.2kHz.
Slide the control from side to side. There
should be a +3dB and -3dB change in
response (±1dB) at the output.
7. 901
®
EQ Response Procedure
7.1 Apply a 250Hz signal 1Volt to the aux
input. Reference a dB meter to the output.
7.2 Switch the EQ switch located on the
rear panel from the other position to the
901 position. There should be a -1dB
change in response at the output.
5.3 Reference a dB meter to the output
with the low frequency control centered and
the wide/narrow switch in the OUT position.
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