Bose OC-1 AWCS-II Service Manual download pdf (Page 15)

2. Frequency Response of LF Output

A. Apply a 100 mVrms, 80 Hz signal to the

controller's input terminals and reference

your dB meter to this frequency.

B. Measure the frequency response across the

LF outputs according to the chart below.

Frequency (Hz) Response (dB)

20 -10.5 ± 1.5

50 +2.25 ± 1.5

80 REF

100 -7.35 ± 1.5

120 -13.68 ± 1.5

150 -21 ± 1.5

180 -27 ± 1.5

200 -30.5 ± 1.5

3. Protection Circuit Test

NOTE: Refer to Figures 13 through 15 and the

installation instructions for connecting the

external protection circuit harness.

A. Connect a signal generator to the controller

input terminals.

B. Connect the controller LF outputs to the

amplifier input terminals.

C. Connect the external protection circuit harness

to the amplifier output.

D. Connect a voltmeter across the amplifier

output terminals.

E. Apply a 57 Hz signal to the controller input

terminals and adjust the signal generator until the

amplifier's output voltage is 40 Vrms.

F. Increase the input to the amplifier until the

output voltage is 47 Vrms. Continue increasing

the input to the amplifier. The amplifier's output

voltage should not rise above 47 volts

(compression occurs at this voltage).

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Bose OC-1 AWCS-II Service Manual Page 15