Loudspeaker Test Procedures - Bose FreeSpace 6 Manual

NOTE: These procedures apply to both Flush-mount and surface-mount loudspeakers. The surface-
mount loudspeaker is not repairable. If this loudspeaker fails the following tests contact your Bose
Service Representative.
1. Rub and Tick Test
Apply a signal of 6.0 Vrms at 80 Hz to the input terminals of the loudspeaker. See Figure 1. No
extraneous noises such as rubbing or ticking should be heard. Replace any driver that has a rubbing or
ticking noise.
NOTE: There is a normal suspension noise. To distinguish between a rub or tick and suspension noise,
displace the cone slightly with your finger. If the rubbing can be made to go away or get worse, then it is a
rub or tick and the driver should be replaced. If the noise stays the same, it is a suspension noise and the
driver is fine. Suspension noise will not be heard with program material.
2. Air Leak Test
Apply a signal of 6.0 Vrms
seconds, listen for air leaks around the driver, speaker terminals, and along all cabinet joints. Repair air
leaks as required.
3. Sweep Test
Sweep the oscillator from 50 Hz to 5 kHz at 6Vrms. There should not be any loud extraneous sounds. If
there are any loud buzzes or distortion, replace the driver. The whooshing noise from the port at around
80 Hz is acceptable.
NOTE: There should not be any buzzes or rattles from the internal connecting wires or components.
Redress any wire or component that buzzes.
4. Phase Test
NOTE: Supply voltage should only be momentarily applied to the speaker input terminals to avoid
possible damage to the speaker.
±
Apply a 6 Vdc 1 Vdc signal to the speaker input terminals (see Figure 1). The driver should move
outward.

Loudspeaker Test Procedures

±
1V at 80 Hz to the speaker input terminals. See Figure 1. For at least 5
Figure 1. Input Terminals
20
® Field
Input Terminals