Bose FreeSpace 360, Supplement Manual, Page: 6 / 13

6
TEST PROCEDURES
1.7 Shut off the amplifier. Open the input
panel and switch the Hard/Soft switch to
the HARD position.
2. In Hard Ground Frequency
Response Test
2.1 Apply a 100 mVrms, 1kHz signal to the
input jack of the amplifier channel under
test.
2.2 Adjust the amplifier volume controls to
maximum. No EQ card installed.
2.3 Reference a dB meter to the output of
the amplifier.
2.4 Shut off the amplifier and insert the EQ
card according to the assembly procedure.
2.5 Turn on the amplifier and measure the
gain. There should be a -2.1
±
1.0 dB
change in gain at the output.
2.6 Reference a dB meter and measure
the response according to the In Hard
Ground Frequency Response chart.
FreeSpace ® 360 In-Ground Loudspeaker
Test Setup Parameters:
1. Install the Equalizer card under test into
one of the Equalizer card jacks located on
the Input Module of the Bose
® 1600 or
1800 Series amplifier, and perform the
following tests. Refer to the 1800V service
manual supplement part number 181812-
S2 for more information.
2. On the amplifier Input Module, place
switch SW1 to the NORM position. Place
switch S2 to the FULL BANDWIDTH
position.
3. The input voltage shall be the actual
input voltage present at the input, not the
open circuit generator input.
Note: Place the Hard/Soft switch S1 to the
SOFT position for the following tests.
1. In Soft Ground Equalizer PCB
Frequency Response Test
1.1 Apply a 100 mVrms, 1kHz signal to the
input jack of the amplifier channel under
test.
1.2 Adjust the amplifier volume controls to
maximum. No EQ card installed.
1.3 Reference a dB meter to the output of
the amplifier.
1.4 Shut off the amplifier and insert the EQ
card according to the assembly procedure.
1.5 Turn on the amplifier and measure the
gain. There should be a 0.0
±
1.0 dB
change in gain at the output.
1.6 Reference a dB meter and measure
the response of the EQ card according to
the In Soft Ground Frequency Response
chart.
In Soft Ground Frequency Response
Frequency Output Level
30 Hz -10.3 dB
±
1.5 dB
180 Hz +9.5 dB
±
1.5 dB
190 Hz +7.8 dB
±
1.5 dB
1000 Hz Reference
3000 Hz +8.1 dB
±
1.0 dB
4000 Hz +7.8 dB
±
1.0 dB
10000 Hz +16.4 dB
±
2.5 dB
In Hard Ground Frequency Response
Frequency Output Level
9 Hz +9.8 dB
±
1.5 dB
30 Hz -8.3 dB
±
1.5 dB
180 Hz +11.2 dB
±
1.0 dB
800 Hz +0.8 dB
±
1.0 dB
1000 Hz Reference
3000 Hz +8.1 dB
±
1.0 dB
4000 Hz +8.7 dB
±
1.0 dB
10000 Hz +18.2 dB
±
2.5 dB