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TSU-4400 Digital Sound Decoders

The TSU-4400 is a universal-style, 4-amp Digital Sound Decoder with 6 function outputs. Designed for models with higher stall currents such as some S, O, and large scale locomotives; this decoder features easy-to-use terminal blocks for no-fault wiring and a higher audio amplifier for awesome volume, indoors or out. It includes an onboard connector for adding a CurrentKeeper (P.N. 810140) to maintain performance over dirty track and switches.

Dimensions: 69 x 30.5 x 14mm Max. Motor Stall Current: 4A
Max. Function Current: 400mA (each output) Function Outputs: 6
Audio Amplifier: 3 Watts, 8-Ohm Load DCC Track Voltage: 7.5V – 26V


The Tsunami2 line is equipped with powerful new amplifiers; therefore, it is important to choose a capable speaker to use with these decoders. Below you will find a list of speakers that are compatible with the TSU-4400.

P.N. Description P.N. Description
810090 50 x 90mm Oval Speaker 810131 28mm Square Mega Bass Speaker
810129 23mm Square Mega Bass Speaker    

MSRP $188.95
P.N. Description Sound Selection Reference
884005 TSU-4400 Steam (replaced by p.n.884009) Steam Sounds
884009 New! TSU-4400 Steam-2 Steam-2 Sounds
885017 TSU-4400 EMD Diesel EMD Diesel Sounds
885025 New! TSU-4400 EMD-2 Diesel EMD-2 Diesel Sounds
885018 TSU-4400 GE Diesel GE Diesel Sounds
885019 TSU-4400 ALCO Diesel ALCO Diesel Sounds
885020 TSU-4400 Baldwin & Other Diesels Baldwin & Other Diesels Sounds
886005 TSU-4400 Electric Locomotives Electric Sounds