The SoundTraxx 884609 is a BLU-4408 Blunami digital sound decoder with the Steam-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 big-scale Blunami: a 4-amp motor rating and screw terminals instead of solder joints, suited to S, O and Large Scale.
Features
90 selectable whistles — the Steam-2 library carries 27 more than the standard Steam set, most of them roadname-specific — plus 12 bells, 10 airpumps and 8 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
Independent and train brakes with adjustable rates
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 884609
Model:
BLU-4408 Blunami
Sound Set:
Steam-2 Steam
Scale:
S, O and Large Scale
Decoder Size:
69 x 30.5 x 14mm
Connection:
Screw terminal blocks (no soldering)
Max. Motor Stall Current:
4A
Function Outputs:
8
Audio Amplifier:
3 Watt, 8-Ohm Load
Sound Channels:
16 polyphonic
Processor:
32-bit, 28 functions
Control Modes:
DC, DCC and Bluetooth wireless
Shop the full SoundTraxx range, compare every DCC decoder we stock, or see the other Steam-2 sound profile decoders. A speaker is not included — browse DCC speakers rated 3 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
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 3 watt or better that fits your shell.
How is Steam-2 different from the standard Steam set?The chuffs, bells, airpumps and dynamos are the same. The difference is the whistle library: Steam-2 offers 90 whistles versus 63 on the standard set, with many roadname-specific additions.
Will it fit my locomotive?This one measures 69 x 30.5 x 14mm and connects by screw terminal blocks (no soldering). Check the space in your shell against that footprint before ordering — other Blunami versions use different connectors and sizes.
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