Decoder: Tsunami 2 - TSU-21PNEM Digital Sound Decoder - 1 amp


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SKU Sounds Price Qty
STX-884003 Steam Sounds $ 98.99 1 In Stock
STX-885009 EMD Diesels $ 98.99 Sold Out
STX-885010 GE Diesels $ 98.99 Sold Out
STX-885011 ALCO Diesels $ 98.99 3 In Stock
STX-885012 Baldwin & Other Diesels $ 98.99 2 In Stock
STX-886003 Electric Locomotives $ 98.99 2 In Stock
STX-884008 Steam Sounds - Collection 2 $ 98.99 4 In Stock
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SoundTraxx Tsunami 2 - TSU-21PNEM Digital Sound Decoder - 1 amp

The TSU-21PNEM is a 1-amp Digital Sound Decoder with six function outputs designed for easy plug-in operation when mated to a 21-pin NEM connector.


  • Dimensions: 30.5 x 15.5 x 6.5mm
  • Max. Function Current: 100mA (each output)
  • Audio Amplifier: 2 Watts, 8-Ohm Load
  • Max. Motor Stall Current: 1A
  • Function Outputs: 6
  • DCC Track Voltage: 7.5V - 22V


The Tsunami2 line is equipped with powerful new amplifiers; therefore, it is important to choose a capable speaker to use with these decoders. The TSU-2200 works best with these SoundTraxx Speakers:

*The Mini Cube Speaker, can be used when wired in series with another Mini Cube Speaker.

Game-changing Features

Tsunami2 leads the industry in processing power with a 32-bit processor that provides the necessary horsepower to support 28 functions, 16 polyphonic sound channels, tons of sound and lighting effects, and advanced motor control.

Tsunami2 Digital Sound Decoders integrate a full-featured sound system, Hyperlight™ lighting effects, Hyperdrive2™ advanced motor control, and a DCC decoder into a single package. Tsunami2 Digital Sound Decoders offer over 50 individual sounds, and over 20 lighting effects in each model!

We have added a host of new recordings including: whistles, horns, bells, compressors – and remastered favorites from years past. These new recordings provide nearly limitless choices to the user! Multiple prototypes in every model means no time spent on a computer downloading files or purchasing special programs. In addition, more powerful audio output, two volume mixers, and our ever-popular Equalizer make the digitized recordings of real engines loud, clear and ultra-flexible.

In 1996, SoundTraxx first introduced Dynamic Digital Exhaust to modelers. Now, we’ve taken this cool feature to new levels of prototypical realism. Tsunami2 is equipped with our newly designed Dynamic Digital Exhaust (DDE), which automatically adjusts the volume and engine RPM schedule to simulate the locomotive producing a range of power during operation. Engine RPM increases as the DDE processor detects greater amounts of demand on the motor, and it reduces as the demand is lifted.

In 2005, SoundTraxx introduced the first “F11” Braking Feature. Tsunami2 takes this even further with three different types of braking – Independent, Train, and Dynamic Braking – allowing you to truly be in the engineer’s seat! Add HEP mode (Head End Power) in diesel versions and the first truly adjustable steam cutoff, and you’ll discover a whole new way to have fun with your trains!

Hyperdrive2 provides incredible low-speed operation and smooth, lurch-free running with a switching mode that will reduce the speed by half – at the press of a key!

Tsunami2 provides full 28-function support and includes our newly developed Flex-Map technology. This makes assigning any function or sound effect to any key easy and intuitive.

Tsunami2 Digital Sound Decoders are designed for installation inside your locomotive and are available in steam, diesel, and electric versions each featuring a full spectrum of prototype-specific sound effects. It is compatible with the NMRA DCC Standards and Recommended Practices.


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