I just had a look at the pdf file for your unit. I imagine that the tiny power amp in your unit is designed to work with either a 4,8 or 16 ohm standard guitar cab and that the extra capacitance introduced by the TRS cord has been accounted for and dealt with. You don't want to use a standard guitar cord (Tip/Sleeve) because that would short the left and right at the preamp. At the cab end the Ring section of the cable won't come into the equation because it only connects to the Tip and the Sleeve.
So use the right cord and rock on brother! Just make sure you put that rear switch in the correct position.