Bose FreeSpace 1B Manuel - Page 4

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1. Rub and Tick Test
1.1 Perform Disassembly/Assembly
Procedure 1.1-1.4 in order to gain access to
the driver to be tested.
1.2 Apply a 10 Volt rms, 10 Hz signal to
the driver input terminals.
1.3 Replace any driver that has a rubbing
or ticking noise. Quiet ticks are acceptable
if they cannot be heard at a distance of 1
foot.
Note: To distinguish between normal
suspension noise and rubs or ticks, displace
the surround of the driver slightly with your
fingers. If the noise can be made to go
away, or get worse, it is a tick or a rub, and
the driver should be replaced. If the noise
stays the same, it is suspension noise and
the driver is fine. Suspension noises will not
be heard with program material.
2. Air Leak Test
2.1 Perform test setup in Figure 1. Test
Setup Diagram, but do not connect the
satellite speakers.
2.2 Apply a 14 Vrms, 45 Hz signal to the
bass module.
2.3 Listen carefully for air leaks (audible as
a whistling or sputtering sound) at cabinet
seams. Minimum listening time should be 5
seconds/test.
3. System Sweep Test
3.1 Connect the system as in Figure 1.
Test Setup Diagram.
Note: Refer to Figure 5. for the
®
Acoustimass
Bass Module Rear Panel
Label diagram.
3.2 Apply a 14 Vrms, 10 Hz signal to both
the left and right inputs.

TEST PROCEDURES

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3.3 Sweep the oscillator from 10 Hz to
500 Hz. Sweep rate shall be 3-5 seconds.
Listen carefully for buzzes, rattles, or other
noises.
Note: A whooshing noise from the bass
box ports at approximately 45 Hz and 110
Hz is acceptable (port tuned frequencies).
Note: A small air leak at the input/output
terminal is acceptable.
3.4 Reduce input signal to 4 Vrms, 500 Hz.
3.5 Sweep the oscillator from 500 Hz to
7 kHz. Sweep rate shall be 3-5 seconds.
Listen carefully for buzzes, rattles, or other
noises.
3.6 Repeat sweep test for LEFT channel
only, then for RIGHT channel only.
3.7 Listen for any extraneous noises.
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Outputs
Power Amplifier
Figure 1. Test Setup Diagram
Satellites
Bass Module
Audio Signal
Generator
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Input