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Test Tones
One way to determine whether all the drivers are operating correctly is to play specific
test tones.
Subwoofer: 80 Hz – mute column speakers at the amplifier (CH A/B/C) if possible to
•
ensure you are only listening to the subwoofer
•
Low-Range* = 150 Hz
•
Mid-Range* = 1000 Hz
•
High-Range* = 8000 Hz
* Mute the subwoofer at the amplifier (CH D) if possible to ensure you are only
listening to the column speaker.
If all tones are present, the drivers are connected and operating properly. If any test
tones do not play, the driver(s) may need to be replaced. Contact Daktronics.
Equalization & Vertical Coverage
SSN-250 systems have two small selector switches
on the side of the main vertical speakers
(Figure 12). From the factory, these switches
are set to "Music" and "Broad" for optimum
performance in most facilities. In some instances,
however, these settings may need to be changed
using a small flathead screwdriver:
Too much bass = set Equalization to "Speech"
•
•
Too much sound bouncing off the walls = set
Vertical Coverage to "Narrow"
Amplifier Indicators
The amplifier in the control enclosure features
several LED indicators that are helpful when
trying to diagnose issues with the audio system
(Figure 13). These indicators are described below
(LED color is in parentheses).
LIM (Red): Illuminates red when the Limiter is engaged.
•
-10 (Blue): Illuminates blue when the output signal
•
exceeds -10 dB below clip.
-20 (Blue): Illuminates blue when the output signal
•
exceeds -20 dB below clip.
CLIP (Red): Illuminates red when the input signal is
•
being clipped. REDUCE MIXER OUTPUT LEVEL!
SIG (Blue): Illuminates blue when a signal greater than
•
-40 dB is present; useful for troubleshooting cable runs.
Refer to amplifier manual listed in Appendix B for more
information.
Figure 12: Main Speaker Selector Switches
Troubleshooting
13
Figure 13: LED Indicators
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