© 2013 Digitrax, Inc.
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Speaker Mounting and baffle or enclosures.
The sound performance of any attached speaker(s) is greatly affected by
the mounting system and required baffle or rear enclosure. The included
8ohm box speaker is pre-mounted in a baffle for your convenience, how
-
ever additional baffles or other mounting systems may need to be taken
into consideration when installing.
The baffle is used to isolate the speaker diaphragm front sound waves
from the “out of phase” rear sound waves. This minimizes sound can-
cellation, particularly at lower frequencies. For most efficient sound
generation, the cubic volume of the baffle should be as large as practically
possible, and the baffle walls should be acoustically rigid so not to allow
acoustic interference.
Practical baffle materials are plastic, cardboard and even sheet metal.
Common items such as cardboard tubes, soda caps, or 35mm film can
-
isters may be modified and trimmed to create reasonable baffles in the
available space. Most HO or O scale or similar locomotives have limit-
ed internal volume within the shell, so the choice of speaker mounting
benefits from some ingenuity to get best sound performance and space.
Of course, you can substitute an alternate after market speaker of the
maximum size for the locomotive you have.
Customizing Your Decoder
Your Digitrax SDH166D SoundFX decoder is ready to run and will
operate and generate sound using address 03 with no additional
programming. On your Digitrax system, simply select the locomotive’s
address and the sound will start. On some DCC systems, it is necessary to
select the locomotive address AND send a command to start the sounds.
For a more prototypical railroading experience, your decoder can be
customized for your specific locomotive by programming some of the
Configuration Variables, or CVs, available. Digitrax Sound decoders can
be programmed using either a programming track or with the operations
mode using the main line. See the Digitrax Decoder Manual or the Digi-
trax web site for more information.
CAUTION: Programming track must not exceed 16V when
programming this decoder.
Digitrax PS14 is the ideal power supply for the PR3.
