Decoder: Tsunami 2 21-Pin Digital Sound Decoder - 1 Amp


Low Stock

1 item left

SKU Style Price Qty
STX-885809 EMD Diesels $ 103.99 1 In Stock
STX-885810 GE Diesels $ 103.99 1 In Stock
STX-885811 Alco Diesels $ 103.99 1 In Stock
STX-885812 Baldwin and Other Diesels $ 103.99 1 In Stock
STX-885823 EMD Diesels 2 $ 103.99 1 In Stock
Add to Wishlist
​ ​

Soundtraxx Decoder: Tsunami 2 21-Pin Digital Sound Decoder - 1 Amp

The Tsunami2 TSU-21PNEM8
The TSU-21PNEM8 is a 1-amp Digital Sound Decoder with 8 function outputs. It is designed for easy plug-in operation when mated to a 21-pin NEM connector. You will feel like you are in the cab with the amazing new features that Tsunami2 has to offer including: Reactive Dynamic Digital Exhaust, Functioning locomotive and train brakes, injectors, power reverse, and firebox flicker. It also offers a large selection of selectable sound effects including: exhaust chuffs(10), prime movers (up to 12), bells (12), Whistles (90), airhorns (40+), couplers, dynamos and more!

For added realism, you’ll love the reactive Dynamic Digital Exhaust (DDE) feature. When your locomotive is traveling across flat terrain and simply maintaining speed, you will hear your locomotive chugging along. But, when the locomotive encounters a grade and the engineer applies more throttle to get the train up the hill, the engine sounds will automatically react and reflect the increase of power needed to crest the hill. DDE accomplishes this by calculating the changes in strain or load on the motor and adjusting the exhaust to appropriately simulate the work the engineer would be doing to the throttle of the engine. This gives Tsunami2 the ability to create the most realistic experience possible.

The large selection of high quality sound effects include:

  • 10 Exhaust Chuffs

  • Up to 12 Prime Movers in each sound profile

  • Up to 12 Bells

  • 90 Whistles

  • 40+ Airhorns

  • Additional couplers, dynamos, cab chatter and more!

Additional realism can be simulated by adding functioning locomotive and train brakes, injectors, power reverse, firebox flicker and more.

The TSU-21PNEM8 simply plugs into models equipped with a 21-pin NEM connector.

The TSU-21PNEM8 can be wired to a CurrentKeeper (P.N. 810140 or 810160) to maintain performance over dirty track and switches.


30.5 x 15.5 x 6.5mm

Max. Motor Stall Current:


Max. Function Current:

100mA (each output)

Function Outputs:


Audio Amplifier:

2 Watt, 8-Ohm Load

DCC Track Voltage:

7.5V – 22V

Sound Channels:



Related Items


Welcome to the Loyalty Points Demo Store :-)

Sign up and receive 5000 pts to test out in our Store.

Earning and redeeming Points

Earns you
Redeems to

Ways you can earn

  • Product Purchase
  • Refer a friend
  • Share on social media

Learn more about our program