KB576: CV 58 Master Volume Control

This article was last updated on Aug. 6, 2014, 4:32 p.m. | Print Article | Leave Feedback

The master volume control CV is CV58, its values range from 0 to 15.  The factory default value for this is 09.

Digitrax SFX decoders have a factory default value of 09 set for CV58.  This works well for 32 ohm speakers.

The decoder will reset to this value whenever you do a decoder reset of CV8=8.

Digitrax SFX decoders built for use with 8 ohm speakers should have this value changed to 4 or 5 for best operation value of 4 or 5, since the decoder may not supply enough current at high volume/drive levels.

Your results may also depend upon track voltage present.

Kato USA says that their AC4400 sounds better if the CV58 value is set lower.

CVs 140-145 can be configured to set individual sound volumes for the various components of the sound output. These can be set up for a CV8=8 factory reset to have values specified in their SDF files.  This means you can download a new .spj file to your decoder with your preferred default values to replace the factory values that will be reset to 09 if you do a CV8 to 8 decoder reset with the original .spj that comes installed in the decoder.

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