Bose FreeSpace 32SE Manuale di servizio - Pagina 6
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1. Phase Test
Note: Perform the Phase Test on the
4 Ohm passive variation of the Model 32SE
loudspeaker only.
1.1 Apply a +6 Vdc level to the input
terminals on the rear of the loudspeaker
enclosure. Be sure to observe polarity.
1.2 With the dc voltage applied, observe
the motion of the loudspeaker cone.
It should move outward.
Note: For the following tests, all listening
should be done at a distance not to exceed
one foot. Set all transformer version loud-
speakers to the 32 Watt tap for these tests.
2. Air Leak Test
2.1.1
4 Ohm passive units:
Apply a 6 Vrms, 80 Hz signal to
the loudspeaker input terminals.
2.1.2
70/100V variation units:
Apply a 30 Vrms, 80 Hz signal to
the loudspeaker input terminals.
2.2 Listen for air leaks around the driver,
front baffle and rear input terminals. Air
leaks will be heard as a hissing or sputter-
ing noise. Repair any air leaks. All repairs
must be hidden.
3. Rub and Tick Test
3.1.1
4 Ohm passive units:
Apply a 6 Vrms, 80 Hz signal to
the loudspeaker input terminals.
3.1.2
70/100V variation units:
Apply a 30 Vrms, 80 Hz signal to
the loudspeaker input terminals.
TEST PROCEDURES
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3.2 Listen for any rubbing or ticking noise
from the driver. Replace any driver that is
defective.
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. If the noise stays the same,
it is suspension noise.
4. Power Sweep Test
4.1.1
4 Ohm passive units:
Apply a 6 Vrms, 80 Hz signal to
the loudspeaker input terminals.
4.1.2
70/100V variation units:
Apply a 30 Vrms, 80 Hz signal to
the loudspeaker input terminals.
4.2 Sweep the signal generator from 80 Hz
up to 3 kHz listening for any buzzes, rattles
or extraneous noises.
Note: The whooshing noise from the port
around 80 Hz is acceptable.
4.3 Reduce the input level to 4 Vrms for
4 Ohm passive units or to 14 Vrms for
70/100V units. Continue sweeping the
signal generator up to 5 kHz, listening for
any buzzes, rattles or extraneous noises.
4.4 Replace any driver that has a buzzing
noise. Redress any wires that make a
buzzing or rubbing noise.
L1
1.5mH
RED
C1
5.0uF
BLACK
COMMON
Figure 1. Model 32SE Passive Crossover
Schematic Diagram
RED
R1
5.1 Ohm
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