48
Test Procedures
9.4 Sweep the audio signal generator from
50Hz to 15kHz. Sweep duration should be
about 3 seconds up and 3 seconds down.
9.5 Listen carefully for buzzes, rattles, or
other extraneous noises from the array
drivers or woofer or from the internal parts.
Verify that there are no air leaks from the
power stand cabinet. The whooshing noise
from the port around 65Hz is acceptable.
Note: If you have the customer’s array
extensions with the system, set up the
system in the extended position instead of
the collapsed position and perform steps 9.2
to 9.5.
L1 Compact Line Array Tests
Set up the unit under test as shown below.
1. Air Leak Test
1.1 Apply a 65Hz, 1Vrms 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 65Hz, 1Vrms sine wave to the
transducer assembly.
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 suspen-
sion noise and the driver is good. Suspen-
sion noise will not be heard with program
material.
3. Transducer Phase Test
3.1 Momentarily apply a DC voltage of 5V,
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, 10Vrms sine wave to the
amplifier input.
4.3 While listening to the output of the sys-
tem, 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
L1 Compact
Line Array
Line Array Test Cable
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