I’m just using normal TS jack cables with the 700 currently. I’m coming out of the effects sends though (so I can have pre and post cab outputs on the QC).
I don’t believe those outputs or the inputs on the PS are balanced so normal jack cables are fine. I think it;s only outputs 3/4 that are balanced, but if the inputs on the PS aren’t, then there’s no benefit to balanced cables.
I suggest using one of the effect send outputs, which are unbalanced. Use a regular TS guitar cable into the 170. The 170 is designed to be at the end of a pedal board so it’s expecting the unbalanced TS connection.
It’s more important that the SD powerstage receives TS so that is a must. There are three options: 1) straight TS, would recommend if you don’t want to make things complicated, 2) TRS to Reamp Box to TS to Poweramp (best for quality as you’re doing proper conversion) 3) straight TRS (just don’t do this).