Digitrax SoundFX SDXH186MT Manual - Halaman 3

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Note: The SDH186MT does not include a speaker. This install is shown with an

optional SP26158BC. Please refer to you locomotive manufacturer for the best

way to attach a speaker to you locomotive motherboard.

Inspect the installation before testing the sounds and replacing the shell. In

particular be sure that wires are correctly routed and not pinched between

the shell and frame.

Place the loco on an active DCC track powered by a compatible DCC system

and select the factory default address 03 to enable sounds for testing.

Be sure F8 (mute) is OFF to allow sound output, and then press

F1 (bell) or F2 (whistle/horn) ON to hear the associated sounds.

Customize sounds by programming Sound CVs to adjust the desired config-

urations, as shown in the following tables of SoundFX CVs. Sound schemes

other than the 8 factory preloaded can be loaded by using a Digitrax PR3

SoundFX Programmer or DCS240.

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 includ-

ed 8ohm box speaker is pre-mounted in a baffle for your convenience,

however 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 cancellation, particularly at lower frequen-

cies. 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.

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