Series 7 sound technology enables realistic steam and diesel locomotive sounds for HO scale models
Customizable with 16, 12, or 8-bit WAV files for tailored sound experiences
Supports up to 4 simultaneous voices for immersive multi-voice operation
Includes 2 CV selectable steam and diesel sound schemes for flexible sound options
Easy Connect 9-pin harness and Smart Power Management for quick installation and reduced power loss
Summarized by Shop
Digitrax SDH167D Series 7 Sound Decoder HO Scale
SDH166D fits many HO locomotives.
Comes with selectable Steam & Diesel sounds so you can use it in any type of locomotive
Features:
▪ Digitrax SoundFX®v3 Sound System Your locomotives will sound “in scale” like the real thing with SoundFX v3 Customizable with 16, 12 or 8 bit .wav file
Scale
HO and larger
Model
SDH167D
Sound Memory
4 MB onboard
Speaker
8 ohm, 16 x 26 x 9 mm box speaker
Harness
10-pin, 9-pin socket for track and function control
Power Consumption
1.0 A (2.0 A peak)
Functions
6 FX3 functions, 200 mA output
DCC Compatibility
FCC Part 15, Class B, RFI compliant
Operating Voltage
9V minimum to 18V maximum
Summarized by Shop
4.5
4 ratings
5
4
3
2
1
Great decoder with a great price shipping was fast
A
Andrew · April 8, 2026
This decoder is a good value at around 40 bucks in many online stores. The motor control is good and the sound acceptable. Be aware of its limitations though. It is an 8 bit decoder and many of the sound files on the Digitrax Sound Depot site are 16 bit and won't load onto this decoder.