SoundTraxx 885623 | BLU-21PNEM8 Blunami EMD-2 Diesel Sound Decoder

The SoundTraxx 885623 is a BLU-21PNEM8 Blunami digital sound decoder with the EMD-2 sound set. Blunami is a Tsunami2 with a Bluetooth radio added, so it runs three ways: as a normal DCC decoder on any NMRA-compliant system, on plain DC, or in wireless mode straight from your phone or tablet.

Wireless mode needs no command station and no programming track — an old DC power pack and the free Blunami app are enough, and CVs can be read and changed over Bluetooth while the locomotive is running. The app is free for iOS and Android. This version is the 21-pin MTC plug-in Blunami, suited to HO scale and larger.

• 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
• Bluetooth control from the free Blunami app (iOS and Android) — over 300 settings without editing a single CV by hand
• Dynamic Digital Exhaust (DDE) automatically matches exhaust volume and RPM to the load on the motor, and the app calibrates it for you
• 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.

Do I need a DCC system to use this?
No. That is the point of Blunami. It runs on a plain DC power pack with no command station at all — you control it from the free Blunami app over Bluetooth. It is also a fully NMRA-compliant DCC decoder if you already run DCC.

Does the app work on Android?
Yes. The free Blunami app is published for both iOS and Android. (Some older listings and dealer pages still say iOS only — that is out of date.)

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 in the app or 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: a second collection of less-common EMD prime movers, called out by cylinder count. The plain EMD set covers the more common 567/645/710 variants. Match the list above to your prototype.

Will it fit my locomotive?
This one measures 30.5 x 15.5 x 6.5mm and connects by nem660 21mtc integral connector. Check the space in your shell against that footprint before ordering — other Blunami versions use different connectors and sizes.