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This is the wiring diagram that someone at Rivera amps sent me. I redid it because the original one was even harder to descipher.

Anyway, as you can see, I am using two of those 3 prong switchcraft jacks. There's the usual negative and positive, and the extra prong is another positive that only works when there's no plug connected.

The speakers are 8 ohms.

When you use the jack on the right, you get 8 ohms mono, as both 16 ohm sides of the cabinet are jumpered positive to positive and negative to negative. Pretty standard wiring of 4 x 8ohm speakers for a total 8 ohms mono.

Now, when you insert a plug on the left side, the positive contact that jumpers both pairs of speakers is lost.

My question is, how is it gonna be 16 ohms per side if both sides of the circuit are not completely isolated. The positive jumper is gone, but the negatives are still hard jumpered.

Anyone?.
I'm not absolutely sure that I know what you're asking, but basically, you have this:

Plug in right side: mono 4x12 8-ohm cab

Plug in left side: mono 2x12 16-ohm cab

Plug in left and right: stereo 2x12 16-ohm cab (16-ohm per channel)

Hope that helps.

Addendum: In stereo mode, you'ld want to be sure to not use amps that were operating in quot;bridgedquot; mode, as the grounds would still be common.

Well, the grounds are hard wired together.
My question is how is it gonna be 16 ohms per side stereo if the 2 jacks are always grounded together?. The positives (tips) are isolated, but the plugs (negatives) are still jumpered.
I was thinking that maybe when you connect 2 cabinets to a guitar amp in stereo, the ground was common to both cabs (this quot;common groundquot; being the amp chassis). If that's true, then it wouldn't really matter if the 2 stereo sections are already grounded together inside one cab.

The guy at Rivera was pretty sure about what the diagram sent me, but I am still having doubts because I don't know what goes on inside the amp.
I really don't want my ENGL Savage to turn into a big paperweight.

You're correct that in stereo, you'll have common grounds. This wouldn't be a problem with a SS stereo amp. (Again, assuming non-bridged operation.) It shouldn't be a problem with separate SS mono amps either. (Non-bridged)

Whether or not it would be a problem with a stereo tube amp, I'm not sure. You could always check, by measuring the resistance between the grounds of whatever stereo outputs you intend to plug in. If they're shorted, no problem.

That definitely makes sense. You'd figure an aircraft tech would just think of that....Doh!!!. I'll definitely perform that check ( as soon as I borrow a Fluke from work )
Thanks for chipping in once again man. God knows you've kept me from frying a few toys.

You're welcome. btw - How did Edwards fair on the BRAC list?
I don't recall seeing it on there, but then again, I was focused on here.

The Air Force Flight Test Center is way too important to air power. I think we are actually gaining a few people with this closures, although some of the military jobs are gonna be contracted out, at least some of the higher level ones.

Cool. We're going to pickup almost 2000 people. I got displaced from Ohio on the last BRAC. I didn't want to move again, however, I believe the move to Florida was a step up.

(No offense to my fellow Yankee's.)