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TEST PROCEDURES
F1 Model 812P Loudspeaker
Equipment Required:
• Audio signal generator
• Neutrik NL4 cable or Spade Lug cable
• Audio amplifier
Test Cable Connection Information
Note: The NL4 connections and the barrier
strip connections are in parallel with each
other, so you can use either during these
tests. Be sure to test all connections before
returning the unit to the customer.
When using the NL4 connection, the input
signal should be applied to the 1+ and 1-
connections. The 2+ and 2- connections are
used for the THRU connections from the
loudspeaker to allow connection to other
speakers.
Test Setup
Note: You can measure the AC input voltage
levels for the following tests at the loudspeaker
barrier strip terminals.
1. Air Leak Test
1.1 Apply a 22 Vrms, 48 Hz sine wave to the
Channel 1 input.
1.2 Sweep the input frequency from 48 Hz to
60 Hz.
1.3 Listen carefully around all gaskets for air
leaks at all gaskets and joints. Replace any
driver that has a rubbing or ticking noise.
2. Rub and Tick Test
2.1 Apply a 22 Vrms, 10 Hz sine wave to the
Channel 1 input.
2.2 Listen carefully for buzzes, rattles, or
other extraneous noises from the drivers or
from the internal parts.
3. Power Sweep
3.1 Apply a 22 Vrms, 20 Hz sine wave to the
Channel 1 input.
3.2 Perform a slow sweep: 4 seconds up,
4 seconds down, from 20 to 200 Hz. The
whooshing noise from the port from 40 to 50
Hz is acceptable.
3.3 Reduce the input signal from 22 Vrms to
6 Vrms. Continue the slow sweep from 200
Hz to 5 kHz. Listen carefully for buzzes,
rattles, or other extraneous noises from the
driver or from the internal parts.
3.4 Change the input frequency back to
20 Hz. Apply a 22 Vrms input signal to the
Channel 1 input. Perform a fast sweep: 1.5
seconds up, 1.5 seconds down, from 20 Hz
to 200 Hz.
3.5 Reduce the input level to 6 Vrms. Con-
tinue the fast sweep from 200 Hz to 1 kHz.
Replace any transducer that has a buzzing
noise, or is defective. There must not be any
buzzes, ticks, rubs, bottoming sounds, air
leaks or other unwanted acoustic noises.
FRONT VIEW REAR VIEW
Power Amplifier
INPUT OUTPUT
Audio Signal
Generator
NL4 Test Cable
Model 812P
Loudspeaker
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