Bose AM-30P Service Manual - Page 31

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FREQUENCY RESPONSE

7. Bass Channel
7.1 Apply a 100Hz, 30mVrms signal to the
left and right inputs (in phase).
7.2 Reference a dB meter to the bass
channel output. Measure the bass channel
output according to the following table.
Frequency
Output
20Hz
-17.0dB
35Hz
+6.9dB
100Hz
0dB
(reference)
140Hz
-0.1dB
190Hz
+3.8dB
400Hz
-24.6dB
8. Left, Right Channel Frequency Re-
sponse
8.1 Apply a 2.5kHz, 100mVrms signal to
the left or right channel only.
8.2 Reference a dB meter to the output of
the same channel as the applied signal in
8.1.
8.3 Measure the left or right channel output
according to the following table.
Note: Perform this test for both channels.
Frequency
Output
150Hz
-8.6dB
240Hz
+8.6dB
440Hz
+2.2dB
750Hz
+3.2dB
2.5kHz
0dB
(reference)
12kHz
+4.8dB
20kHz
-11.3dB
TEST PROCEDURES
9. Center Channel Frequency Response
Tolerence
± 3.0dB
± 2.0dB
-
± 1.5dB
± 1.5dB
± 3.5dB
Tolerence
± 3.0dB
± 1.8dB
± 1.5dB
±1.5dB
-
± 1.5dB
± 3.0dB
31
9.1 Apply a 2.5kHz, 50mVrms signal to the
left and right inputs (in phase).
9.2 Reference a dB meter to the center
channel output.
9.3 Measure the center channel output
according to the following table.
Frequency
Output
150Hz
-8.6dB
240Hz
+10.1dB
440Hz
+1.1dB
750Hz
+3.1dB
2.5kHz
0dB
(reference)
12kHz
+4.8dB
20kHz
-11.3dB
10. Surround Channel Frequency
Response
10.1 Apply a 2.5kHz, 50mVrms signal to
the left and right inputs (out of phase).
10.2 Reference a dB meter to the surround
channel output.
10.3 Measure the surround channel output
according to the following table.
Frequency
Output
150Hz
-13.1dB
240Hz
+7.0dB
550Hz
+0.7dB
800Hz
+2.7dB
2.5kHz
0dB
(reference)
12kHz
+6.5dB
20kHz
-7.3dB
Tolerence
± 3.0dB
±1.5dB
±1.5dB
±1.5dB
-
±1.5dB
± 2.5dB
Tolerence
± 3.0dB
± 1.5dB
± 1.5dB
±1.5dB
-
± 1.5dB
± 3.0dB