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Zimo MX646 ('N' 6-pin direct, 'R' 8-pin on harness and 'F' 6-pin on harness) Sound Decoder

Code: MX646

Zimo MX646 Sound Decoder Zimo MX646 Sound Decoder 28x10.5x4mm
1A continuous / 1.5A peak
1W audio / 4 Functions

NOTE: The MX646 was superseded by the MX649, which in turn has been superseded by the MS490

Zimo MX646 Sound Decoder

Variants / Sub-Products

MX646N'N' 6pin direct plug-in

MX646R'R' 8pin plug on wired harness

MX646F'F' 6pin plug on wired harness


The MX646 sound decoder from Zimo shares all the same benefits as the larger MX645/MX644 decoders, but without the built-in energy storage connections, and with fewer AUX function outputs. The advantage is that the MX646 is much narrower, so great for long thin spaces, even in some N gauge models.

The MX646 can have a stay-alive capacitor added, but it must go through SPEIKCOMP circuitry.

Technical Specification

  • 1W audio power
  • 8ohm speakers supported
  • 6-channel output.
  • 1.0A continuous motor output / 1.5A peak for short periods
  • 4 AUX function outputs, max combined 0.8A
  • 2 logic level outputs
  • Servo control line or SUSI
  • 32 MBit memory
  • Railcom
  • DCC, DC-Analog, MM, AC-Analog

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SPEIKOMP Zimo Energy Storage Components

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