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Speaker Mounting and Baffle or Enclosures:
The sound performance, volume and efficiency of any attached speaker(s)
is greatly affected by the mounting system and required baffle or enclo-
sure. An 8 ohm speaker in a baffle is required to realize sound output
via the host locomotive 21MTC pin connections. Additional baffles or
other mounting systems may need to be taken into consideration when
installing. Baffles are used to isolate the speaker diaphragm front sound
waves from the "out of phase" rear sound waves to minimize sound can-
cellation, particularly at lower frequencies. For the 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.
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Digitrax SoundFX
v3 System:
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 SoundFX v3 lets you make your locos sound "in scale" like the
real thing! The SoundFX v3 sound CVs used in the range of CV140 to
CV240 let you customize your decoder without having to reload a new
sound project. Digitrax sound decoder CVs can be programmed using
either a programming track or with the operations mode using the main
line. See the Digitrax web site for more information on programming
CVs.
Customizing Your Decoder:
This decoder will initially operate and generate sound using address 03.
On your Digitrax system, simply select the decoder's address and the
sounds will start. [On some DCC systems, it is necessary to select the
decoder address AND send a command to start the sounds].
The factory supplied sound project loaded into the SDH187MT sets CV60
to 00 for a GP38 diesel locomotive scheme. The other preloaded scheme
is selectable with the value 1 in CV60. If the locomotive you're installing
in is not one of the preloaded schemes you can download the appropri-
ate project from the Digitrax website.
© 2023 Digitrax, Inc.
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www.digitrax.com
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