Bose AmPlus 50 Supplement Manual page 29

1.3 Reference a dB meter to the output
level at J6. This is the reference level for
this test.
1.4 Shut off the AmPlus™ Amplifier, and
install the Model 1B Equalizer PCB into
the EQ jack for the channel you are using,
J9 for channel 1 or J10 for channel 2.
1.5 Place switch S1 on the Model 1B
Equalizer PCB to the FLUSH position.
1.6 Turn the Model 1B Equalizer Card Bass
Gain potentiometer R33 fully CW.
1.7 Turn on the AmPlus Amplifier and
measure the output level at J6. It should be
+2.8 dB ± 1.0 dB.
2. Surface EQ Frequency Response Tests
2.1 Set up the AmPlus Amplifier as listed in
the Test Setup Notes.
2.2 Install the Model 1B Equalizer PCB into
the EQ jack for the channel you are using
for this test, J9 for channel 1 or J10 for
channel 2.
2.3 Shut off the AmPlus Amplifier, and
place switch S1 on the Model 1B Equalizer
PCB to the SURFACE position.
2.4 Turn on the AmPlus Amplifier, and apply
a balanced 31.5 mVrms, 1 kHz signal to the
inputs at J1.
2.5 Reference a dB meter to the output at
J6. This is the reference level.
2.6 Perform the tests as listed in Table 11,
®
FreeSpace Model 1B Surface EQ
Frequency Response Tests.
TEST PROCEDURES
29
Freq. Input
60 Hz 31.5 mV
100 Hz 31.5 mV
200 Hz 31.5 mV
500 Hz 31.5 mV
1 kHz 31.5 mV
2 kHz 31.5 mV
8 kHz 31.5 mV
10 kHz 31.5 mV
Table 11. FreeSpace Model 1B Surface EQ
Frequency Response Tests
3. Flush EQ Frequency Response Tests
3.1 Set up the AmPlus Amplifier as listed in
the Test Setup Notes.
3.2 Install the Model 1B Equalizer PCB into
the EQ jack for the channel you are using
for this test, J9 for channel 1 or J10 for
channel 2.
3.3 Shut off the AmPlus Amplifier, and
place switch S1 on the Model 1B Equalizer
PCB to the FLUSH position.
3.4 Turn on the AmPlus Amplifier, and
apply a balanced 31.5 mVrms, 1 kHz
signal to the inputs at J1.
3.5 Reference a dB meter to the output at
J6. This is the reference level.
3.6 Perform the tests as listed in Table 12,
FreeSpace Model 1B Flush EQ Frequency
Response Tests.
Freq. Input
200 Hz 31.5 mV
500 Hz 31.5 mV
1 kHz 31.5 mV
2 kHz 31.5 mV
8 kHz 31.5 mV
10 kHz 31.5 mV
Table 12. FreeSpace Model 1B Flush EQ
Frequency Response Tests
Output Level
+4.25 dB ± 1.5 dB
+3.3 dB ± 1.5 dB
+2.0 dB ± 1.5 dB
+5.25 dB ± 1.5 dB
REFERENCE
-1.0 dB ± 1.5 dB
+7.75 dB ± 1.5 dB
+9.5 dB ± 2.5 dB
Output Level
+0.5 dB ± 1.5 dB
+0.6 dB ± 1.5 dB
REFERENCE
-1.3 dB ± 1.5 dB
+7.6 dB ± 1.5 dB
+7.8 dB ± 2.5 dB