CBT36K Assembly Manual
Page
49
of 89
9. TEST THE WIRING:
9.1.
V
ERIFY
C
ORRECT
P
OLARITY OF
D
RIVERS
M
OUNTED TO
F
RONT
P
ANEL
:
9.1.1.
Prepare to Test Polarity:
The wired panel on the right is ready for test. The
RED and BLACK wires extending off of the bottom
of the panel are the input to each group of drivers.
The larger 18 AWG wire connects to the ND91s
and the smaller 24 AWG to the tweeter modules.
9.1.2.
Test Mid-Bass Polarity:
Flip the panel over and hold the BLACK 18 AWG
lead to the (-) terminal of the 9v battery and tap the
RED lead on the (+) terminal. The ND91 drivers
will all jump forward if the speaker is properly
wired. Watch each driver as you tap the RED lead
to the battery and verify they all move forward.
Also, you should notice that the amount of
movement decreases as you move up towards the
top of the speaker crossing the bank boundaries
along the way.
9.1.3.
Tweeter Test Requires More
Voltage:
Now we will repeat the test for the tweeter array. In
order to visually see the movement, we need a
higher voltage drive level. We can get this by
connecting two 9v batteries as shown. Connect the
RED lead to the exposed (+) terminal and the
BLACK lead to the exposed (-) terminal.
DO NOT ALLOW THE LEADS OF THE
BATTERY TO TOUCH EACH OTHER, BECAUSE
THE BATTERIES MAY OVERHEAT AND COULD
POTENTIALLY CATCH ON FIRE.
9.1.4.
Test Tweeter Polarity:
Connect the BLACK test lead to the BLACK 24
AWG input to the tweeter modules and tap the
RED test lead to the RED 24 AWG input. Position
your head so that you can sight down the speaker
as shown above and you should be able to see
each tweeter move forward. Tweeters in banks 4
and 5 will just barely move but look carefully and
you will see the movement.
