Bose 301 II Series Handmatig - Pagina 3
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Pagina afdrukken1. Phase Test
1.1 Momentarily apply 8
speaker input terminals. Observe polarity
when connecting the dc power supply. The
woofer should move outward.
1.2 Momentarily apply the positive side of
±
an 8
1Vdc power supply to the red wire
that is attached to the tweeter. Connect the
negative side of the power supply to the
speaker's negative input terminal. The
tweeters should move outward.
2. Air Leak Test
2.1 Apply an 8Vrms, 45Hz signal to the
speaker input terminal.
2.2 Listen for air leaks around the woofer,
tweeter mounting brackets and the terminal
cup.
3. Rub and Tick Test
3.1 Apply an 8Vrms, 10Hz signal to the
speaker input terminals.
3.2 No extraneous noise 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 woofer slightly with
your fingers. If the noise can be made to go
away or get worse, it's a rub or tick and the
woofer should be replaced. If the noise
stays the same, it's normal suspension
noise and it will not be heard with program
material.
TEST PROCEDURES
±
1Vdc to the
3
4. Power Sweep Test
4.1 Apply an 8Vrms, 10Hz signal to the
speaker input terminals.
4.2 Sweep the speaker from 10Hz to
3kHz.
4.3 Lower the applied voltage to 4Vrms
and continue to sweep the speaker to
5kHz.
4.4 Listen for any buzzes, rattles or other
extraneous noises from the speaker.
Replace any woofer or tweeter that fails
this test. Tighten any screws or redress any
wires that buzz.