Bose 151 Manual de serviço - Página 3

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Bose 151 Manual de serviço
Audio Signal
Generator

3. Air Leak Test

A. Using the 6 Vrms signal,set the oscillator frequency to 10 Hz. Block the ports. For at
least 3 seconds, listen for air leaks around the driver and baffle. If there is a "whooshing"
noise around the driver, re-position the driver gasket behind the driver to make an airtight
seal. If there are similar noises around the baffle, make sure that it is securely fastened to
the speaker cabinet.

4. Phase Test

NOTE: Supply voltage should only be momentarily applied to the speaker input terminals to
avoid possible damage to the speaker.
A. Set a DC power supply to 10 volts. To ensure that the driver is connected in phase,
connect the positive lead of the supply to the positive (+) speaker input terminal and the
negative lead to the negative (-) input terminal. The driver should move outwards with the
application of the supply voltage.
+
-
Figure 1. Test Connections 151™ Speaker
Power Amplifier
Input
-
+
S p e a k e r
Red (+)
Black (-)
2
O u t p u t
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+
-
+