Need help wiring : stereo jacks for dual mono cab

[xiwiwix]

I have a Marshall 1960A and want to use two "stereo input jacks" for a dual mono cab set up. Please help me figure out how to wire it up.

I want to run four 8 ohm speakers (8+8=16) (8+8=16) in two sets of 16 ohms.
I'm using a stereo amp and want to run it at 8 ohms total.

Below is the plate loaded with the stereos jacks I'll be using to connect the stereo amp to, and a diagram of the wiring schematics I'll be using.

I understand the wiring schematics, but don't know what's what on the input jacks (which points are what).

 

[xiwiwix]

These are the jacks I have, and I'll eventually get proper jacks.

There's 3 point on these jacks, which I'm calling A (left side) B (middle) C (right side). <-with both large contact points on the bottom. I'm assuming one's the ground, and the other two are active, but which do I use for mono operation?

Also, since the plate is made of plastic, will they be grounded at all/properly? (Will it work with a plastic back plate?)

 

[Rufus Leaking]

These are the jacks I have, and I'll eventually get proper jacks.

There's 3 point on these jacks, which I'm calling A (left side) B (middle) C (right side). <-with both large contact points on the bottom. I'm assuming one's the ground, and the other two are active, but which do I use for mono operation?

Also, since the plate is made of plastic, will they be grounded at all/properly? (Will it work with a plastic back plate?)

Roland!

Those are TRS jacks (tip, ring, sleeve) made for stereo 1/4" jacks. You can still use them, just use the tip and sleeve jacks only - tip for positive, sleeve for negative.

Hope you are well!

Randy

 

[xiwiwix]

Hey Randy! Thanks for the info bud. I am well. Happy (late) thanksgiving!