58
Test Procedures
2.4 Listen carefully for any extraneous
noises such as rubbing, scraping or ticking.
Note: To distinguish between normal sus-
pension noise and rubs or ticks, displace the
cone slightly with your fingers. If the noise
stays the same, it is normal suspension
noise and the driver is good. Suspension
noise will not be heard with program mate-
rial.
3. Transducer Phase Test
3.1 Momentarily apply a DC voltage of 10V,
positive applied to the positive tab of the dual
banana jack on the line array test cable and
negative applied to negative (gnd) tab.
3.2 All of the driver cones should move
outward when the DC voltage is applied.
3.3 Rewire any incorrectly connected trans-
ducers.
4. Line Array Sweep Test
4.1 Set up the upper or lower line array
section as shown in the figure on the previ-
ous page.
4.2 Apply a 100 Hz, 10 Vrms sine wave to
the input.
4.3 While listening to the output of the
system, sweep the input frequency slowly
from 100 Hz to 15 kHz.
4.4 Listen carefully for any extraneous
noises such as buzzing and ticking.
Power Amplifier
INPUT
OUTPUT
Audio Signal
Generator
Bass Module
Test Cable
B1 or B2
Bass Module
Bass Module Tests
Set up the unit under test as shown below.
B1 Bass Module Tests
1. Air Leak Test
1.1 Apply a 100 Hz, 20 Vrms sine wave to
the unit under test.
1.2 Listen carefully for air leaks from around
the end cap, the transducers and the grille.
Air leaks will be heard as a hissing or sput-
tering sound. All repairs must be hidden.
Test duration should be 5 seconds minimum.
2. Transducer Rub and Tick Test
2.1 Remove the transducer you wish to test
using the disassembly procedures in this
manual.
2.2 Connect a signal generator directly to
the terminals of the transducer assembly
under test.
2.3 Apply a 10 Hz, 10 Vrms signal to the
transducer assembly.
2.4 Listen carefully for any extraneous
noises such as rubbing, scraping or ticking.
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