SoundTraxx 885823 | TSU-21PNEM8 Tsunami2 (1-amp) EMD-2 Sound Decoder

The SoundTraxx 885823 is a TSU-21PNEM8 Tsunami2 digital sound decoder with the EMD-2 sound set. Tsunami2 combines a 16-bit sound system, Hyperdrive2 motor control, Hyperlight lighting effects and a full NMRA-compliant DCC decoder on one board, driven by a 32-bit processor with 16 polyphonic sound channels.

This version is the 21-pin MTC plug-in decoder, rated 1A and suited to HO scale and larger. Dynamic Digital Exhaust reads the load on the motor and notches the engine up and down on its own, so the locomotive sounds like it is working for its train.

• 8 EMD-2 prime movers: EMD 567 12-cylinder (no transition), EMD 567C 16-cylinder non-turbo, EMD 645E 12-cylinder non-turbo, EMD 645E 12-cylinder turbo, EMD 645F 16-cylinder turbo, EMD 645E 20-cylinder turbo, EMD 710G 12-cylinder, EMD 710G 16-cylinder
• Over 40 air horns and 13 bells, plus air compressors, couplers and dynamos
• Dynamic Digital Exhaust (DDE) matches exhaust volume and RPM to the load on the motor automatically
• Three braking types: independent, train and dynamic braking
• Hyperdrive2 motor control for smooth, creep-speed switching
• Over 20 Hyperlight lighting effects across 8 function outputs
• 16 polyphonic sound channels on a 32-bit processor, with a 7-band equalizer and adjustable reverb
• CurrentKeeper ready — works with the SoundTraxx 810140 CurrentKeeper

Shop the full SoundTraxx range, compare every DCC decoder we stock, or see the other EMD-2 sound profile decoders. A speaker is not included — browse DCC speakers rated 2 watt or better, and find install parts in DCC wiring. Add a SoundTraxx 810140 CurrentKeeper to keep sound alive over dirty track and turnouts.

Will this fit my locomotive?
It measures 30.5 x 15.5 x 6.5mm and connects by 21-pin nem (21mtc) plug. Check that against the space in your shell before ordering — other Tsunami2 versions use different connectors and sizes.

Is a speaker included?
No. Pair it with an 8-ohm speaker rated 2 watt or better that fits your shell.

Which prime movers do I get?
All 8 listed above, selectable via CV 123. You are not locked to one engine sound — pick whichever matches your prototype.

EMD-2 or plain EMD — which do I want?
This is the EMD-2 set: less-common EMD prime movers, named by cylinder count. The plain EMD set covers the more common 567/645/710 variants.

Does it run on DC?
Yes. Tsunami2 runs on a standard DC power pack as well as DCC, though sound and lighting options are limited on DC. Full function control needs a DCC system.