Out 3 to power amp: TRS or TS? (Unity Gain)

Hey folks.

I’m currently using Out 1 (mono) to FOH and Out 3 (mono) to my external power amp for my cab (SD PS170). In the wiki, I found:

The outputs 3&4 are TRS jacks. If you use a TRS cable in output 3&4 you will get unity gain. If you use a TS cable, you will get 6 dB less signal, Quad Cortex doesn’t sense if the signal is balanced or not and compensate. So with a TS cable, you get half the output voltage and the gain must be boosted 6dB to get unity gain into a guitar amp effects loop…

So … even if my external power amp is running a mono (TS) input, I “should” use a TRS cable to get a full unity gain signal? Am I getting this right?

Niklas