For heavens sake man, use your head.
You're in the best position to answer this yourself.
Actually, YOU are the ONLY one who CAN answer this.
YOU are the ONLY one who knows where the components are being located relative to each other.
YOU are the ONLY one who knows how far you are mounting the speakers from the amp.
YOU are the ONLY one who knows how you want to route the cable.
etc, etc, etc...
If it's that critical simply take some string and run it from the amp to the speakers. Cut it and measure it. Violia! There's your answer!