12v Trigger connection for Pass Labs X150.5

Hi all,

need some advice here, esp from Pass Labs amp users. The 12V trigger of the X150.5 has two binding posts (Red and Black) just like the speaker outputs, that means it takes only spades input.

some of the pre-amp with 12V trigger has only a single 1/8" output. how to connect it to the X150.5? 1/8" --> Spades? to red or black binding post?

i'm confused. pls assist.

Thank you.