Bose LIFESTYLE 550 Servis Kılavuzu - Sayfa 13

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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.

TEST PROCEDURES

5.3 Reference a dB meter to the output

with the low frequency control centered and

the wide/narrow switch in the OUT position.

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.