Bose 151 Service Manual - Page 3

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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 (-)

O u t p u t