Boogie 4x12 Speaker wiring question.

To make a very long story short, I've got a Boogie 4x12 - 2 Black Shadows, 2 GL 65 Celestions (all 8 ohms). Wires were changed, etc., and I want to make absolutely sure that it's wired up @ 4 ohms.

I've done a little looking, but the average diagram drawer evidently feels as if anybody looking at it has a masters in engineering. I am but a simple cave man, and wish somebody would know of a diagram that will let me know I'm doing it right for sure!

Thanks!

Thanks, gts! Save my arse, brother!