SFX004 Soundbug Sound Decoder for DH165xx decoders and others

This product has been replaced by the Soundbug for DH165xx decoders and others (SFX006) and is no longer available. Click here to view the SFX006.

Digitrax Soundbug Modules:

  • Are Plug N’ Play with any 165 series board replacement style decoder
  • Used as a wired installation to add sound to other 5 series decoders
  • Have Smart Power Management - no booster or programmer shutdowns!
  • Can function as a standalone Stationary Track-side/Under-layout sound decoder
  • Fully customizable Digitrax SoundFX® sound capability
  • Includes 28mm 32 Ohm Speaker & 330uF Capacitor

Visit Digitrax Sound Depot to learn how to customize the sound project included with your decoder and how to download different projects that are available for free.


0.67” x .807”
Plug in or Wired
Function Outputs
Current Rating
Not a motor control decoder-Sound Only
32 Ohm 28mm round
Simultaneous Voices
Onboard Sound Memory
4 Megabit
No Worries Warranty (read more)


Digitrax gives a one year "No Worries" Warranty against manufacturing defects and accidental customer damage

on all Digitrax command stations, boosters, throttles, decoders, power supplies and layout control devices.

That's it! A simple, straightforward warranty with no tricky language!

Repairs are simple, too!  Just fill out the form and return your items directly to Digitrax for repair.  We'll get them fixed up and return them to you as quickly as possible.  Please DO NOT return items for repair to the place of purchase.

Make Sure Your Item Needs To Be Repaired Before Sending It To Us!  Many of the units we receive for repair do not need any repairs at all. Before you send any units for repair, please take a few minutes to review our Support Options.

1.  Check the Tech Support Depot for help.  Search for troubleshooting guides.

2.  Click here to send Digitrax Tech Support a message.

Please give your name, e-mail address, phone number and when is the best time to contact you.  Please give a complete description of the issue you are having.

Many problems are easily resolved by contacting Digitrax Tech Support without having to send in your unit.

Note: Some Digitrax products are no longer repairable due to unavailability of repair parts. Un-repairable items will be returned to you at no charge with no repairs made.

Please Note:  Most of our products are not user serviceable. If a defect or accidental damage occurs, return the unit directly to Digitrax for service.  Please do not open the Command Station/Boosters (except for making voltage adjustments or changing batteries per the manuals).  Please do not remove the shrink wrap protective sleeves from the Digitrax decoders. Shrink may be peeled back to expose pads for adding function wires. 

Accessory items that are not covered under the No Worries Warranty carry a 90 day warranty against defects in materials and workmanship.  This includes speakers, wire, cables, battery covers, etc.

Intentional damage and customer modifications outside the scope of instructions provided with the product are not covered by this warranty. 

Do NOT send a locomotive with your decoder. If a locomotive is sent to Digitrax, Digitrax will ship the entire package back, unrepaired.