Bose 301 Series User Manual download pdf (Page 5)

5

TEST PROCEDURES

Note: Remove the grille for the following

tests.

General Test Set Up

Connect the output of a signal generator to

the input of a power amplifier. Connect the

output of the power amplifier to the input

terminals of the speaker under test. Refer

to figure 2, (on page 4) test equipment set

up.

1. Woofer Rub and Tick Test

1.1 Apply a 7 Vrms, 10 Hz signal to the

input terminals of the speaker under test.

No extraneous noises such as rubbing,

scraping or ticking should be heard.

Note: To distinguish between normal sus-

pension noise and rubs or ticks, displace

the cone on the woofer slightly with your

fingers. If the noise can be made to go

away or get worse, it is a rub or a tick and

the woofer should be replaced. If the noise

stays the same, it is a normal suspension

noise and the woofer is fine. Suspension

noises will not be heard with program

material.

2. Air Leak Test

2.1 Apply a 7 Vrms, 35 Hz signal to the

input terminals of the speaker under test.

2.2 Listen for air leaks around the woofer,

tweeters and cabinet seams. Any air leaks

will be heard as a sputtering or hissing

sound.

2.3 Replace or reposition any gasket where

an air leak can be heard.

3. Sweep Test

3.1 Apply a 7 Vrms, 10 Hz signal to the

input terminals of the speaker under test.

3.2 Sweep the input generator from 10 Hz

to 5 kHz. There should be no extraneous

sounds.

3.3 Reduce the input voltage to 3 Vrms, and

continue sweeping from 5 kHz to 15 kHz.

3.4 Redress any wires or components that

buzz or rattle. Replace any woofer or

tweeter that is found to be defective.

4. Phase Test

Note: The supply voltage should only be

momentarily applied to the speaker input

terminals to avoid possible damage to the

speaker.

4.1 Set a DC power supply to 9 volts.

Connect the positive wire from the power

supply to the positive (+) connector of the

input terminal and the negative wire to the

negative (-) connector of the input terminal.

The woofer should move outward with the

application of the supply voltage.

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