Clarification of Corda 2Stepdance input impedance needed

What does "120 / 17 Kohm" mean, for the input impedance spec for the Corda 2Stepdance?
17K looks right, but what does the 120 mean? Is there an option to configure it for 120 ohms input impedance? If so, I don't see any mention of that in the manual.
 
Greg.

 

Ah - is it 120K in low power mode, and 17K in high power mode? That would make more sense.

 

It is related to the gain setting. Low gain and it will be 120 Kohm (NOT 120 ohm). High gain and it will be 12 Kohm.
 
Use whatever gain setting you need, not whatever input impedance you want.