Bose 4.2 Series II User Manual download pdf (Page 4)

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601™ II TEST PROCEDURES

1. Sweep Test

1.1 Apply a 10Vrms, 15HZ signal to the

input terminals of the speaker.

1.2 Sweep the oscillator from 15HZ to

2.5kHZ. There should not be any loud

extraneous noises coming from the woofer.

Note: The woofers are wired in series. If

one woofer is open the other one will not

work.

1.3 Sweep the oscillator from 1.5kHZ to

15kHZ. Replace any tweeter that is inop-

erative or buzzing.

2. Rub and Tick Test

2.1 Apply a 10Vrms, 25HZ signal to the

input terminals of the speaker.

2.2 No extraneous noises such as rubbing,

scraping or ticking should be heard.

Note: To distinguish between normal

suspension noise and rubs or ticks, dis-

place the cone of the driver slightly with

your fingers. If the noise can be made to go

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

driver should be replaced. If the noise stays

the same, it is normal suspension noise

and it will not be heard with program mate-

rial.

3. Air Leak Test

3.1 Apply a 10Vrms, 40HZ signal to the

input terminals of the speaker.

3.2 Listen for any whooshing sound com-

ing from the cabinet or around the woofer.

Repair any air leaks.

4. Phase Test

4.1 Momentarily apply 10VDC to the input

terminal of the speaker. Observe the

polarity when connecting the DC supply.

4.2 The woofer should move outwards with

the momentarily applied DC voltage.

4.3 Visually check the tweeters wiring to

ensure proper phasing.

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