The SoundTraxx 885809 is a TSU-21PNEM8 Tsunami2 digital sound decoder with the EMD 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.
Features
9 EMD prime movers: EMD 567 No Transition, EMD 567 Non-Turbo, EMD 567 Turbo, EMD Dual 567, EMD 645 Non-Turbo, EMD 645 Turbo, EMD Dual 645 Turbo, EMD 710 Turbo, EMD 710 G3C-T2
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
More Information
Item Number:
SoundTraxx 885809
Model:
TSU-21PNEM8 Tsunami2
Sound Set:
EMD Diesel
Scale:
HO scale and larger
Decoder Size:
30.5 x 15.5 x 6.5mm
Connection:
21-pin NEM (21MTC) plug
Max. Motor Stall Current:
1A
Function Outputs:
8
Audio Amplifier:
2 Watt, 8-Ohm Load
DCC Track Voltage:
7V – 22V
Sound Channels:
16 polyphonic
Processor:
32-bit, 28 functions
Shop the full SoundTraxx range, compare every DCC decoder we stock, or see the other EMD / EMD-2 Diesel 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.
FAQ
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 9 listed above, selectable via CV 123. You are not locked to one engine sound — pick whichever matches your prototype.
EMD or EMD-2 — which do I want?This is the EMD set: the common 567, 645 and 710 prime movers. The separate EMD-2 set carries a second group of less-common variants called out by cylinder count. Match the list above to your prototype.
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.
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