Double Advent wiring question...

That is correct. Here ya go!!
https://www.youtube.com/watch?v=nzGMdr6SH-E

Ishkabible, are you stacking one speaker on top of another?

Actually the way you describe it, if I'm reading you right, sounds like parallel which if they are 8 ohm speakers will yield a 16 ohm load. If when you visualize the wire and the terminals it looks like a ladder, that is parallel. 

To get a 4 ohm load from two 8 ohm speakers, wire in series. Wire from the amp + goes to first speaker +, then from first speaker - to second speaker +, then from second speaker - all the way back to the amp -.

@millercarbon : You've got it wrong! Parallel wiring reduces combined impedance to half - two 8 ohm speakers become a 4 ohm load. As the OP stated. Series connection of two 8 ohm speakers doubles the impedance - 16 ohms is the result. This I don't recommend because it will ruin the amplifier's ability to damp the 16 ohm pair! Stick with parallel!

I give millercarbon an F on this electronics pop test!