Bose 131 Service Manual

5
TEST PROCEDURE
1. Phase Test
1.1 Momentarily apply 13.3 ± 1Vdc to the
speaker input terminals. Observe polarity
when connecting the dc power supply. The
driver should move outward.
2. Air Leak Test
2.1 Apply a 6Vrms, 10-15Hz signal to the
speaker input terminal.
2.2 Listen for air leaks around the driver
and the enclosure. There should be no
audible air leaks.
3. Rub and Tick Test
3.1 Apply a 6Vrms, 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 driver slightly with
your fingers. If the noise can be made to go
away or get worse, it's a rub or tick and the
driver should be replaced. If the noise stays
the same, it's normal suspension noise and
it will not be heard with program material.
4. Power Sweep Test
4.1 Apply a 6Vrms, 10-15Hz signal to the
speaker input terminals.
4.2 Sweep the speaker from 10Hz to
15kHz. The sweep rate shall be 3-5
seconds for increasing and decreasing
sweep.
Note: A whooshing noise from the port at
approximately 90Hz is acceptable.
4.3 Listen for any buzzes, rattles, or other
extraneous noises. Replace any driver that
fails, and redress any wires that might
buzz.

Bose 131 Specifications

General

Brand	Bose
Model	131
Category	Speaker System
Language	English