Bose SM-1 User Manual Page 10

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10
TEST PROCEDURE
1. Rub and Tick Test
1.1 Apply a 10 Hz, 25 Volts rms signal
(with the use of an amplifier) to the speaker
terminals. Refer to Figure 8. No extraneous
noises such as rubbing, scraping, or ticking
should be heard.
2. Sweep Test
2.1 Apply a 25 Volt signal, and slowly
sweep the oscillator from 10 Hz to 75 Hz.
There should be no loud extraneous
noises. If there are any loud buzzes or
distortion, replace any defective driver.
2.2 Reduce the amplifier output to 10 Volts
and continue sweeping the signal from 75
Hz to 15 kHz. Listen for any buzzes, rattles,
and other extraneous noises. Dress any
wires that might be the cause of the noise.
3. Phase Test
3.1 Using a 6 to 12 Volt dc supply.
Connect the positive (+) wire to the positive
terminal and the negative (-) wire to the
negative terminal on the speaker. Check
that all drives are in phase, all drivers
should move outward. If one or more
drivers move inward the wiring should be
checked. Refer to Figure 4.
Figure 8. Test Set-Up
901 I and II speaker Test
901 I and II Equalizer Test
1. Gain Test
Note: The switches should be pushed in at
the top and the treble contour rotary switch
should be on the dot.
1.1 Apply a 200 Hz, 500 mV signal to the
input.
1.2 Reference a dB meter to the input
signal applied.
1.3 Increase the input voltage to 4.25 Volts
for the series I EQ and 5 Volts for the series
II. The response should be 18 dB for the
series I, and 19 dB for the series II ±3 dB.
2. Frequency Response Test
2.1 Apply a 200 Hz, 500 mV signal to the
input.
2.2 Reference a dB meter to the output.
2.3 Refer to the frequency response table
on the following page for the response test.
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