Honestly, there's no need to "bump" your post if it's only been six hours since you first posted.

Also, it would help if instead of just describing in words what you're seeing in your machine, you posted actual photos of the components in question, with enough detail to see how the wiring is arranged. Make sure the photos are in focus, have good lighting, and are close enough to the parts to see details.

I'm not familiar with the machine, nor Stern's general approach to sound back then. But if the two original speakers are actually wired together, the "resistor" you're seeing might be a capacitor that's part of a crossover, and the two speakers instead of being stereo sound, are just woofer/midrange and tweeter. Seeing a photo of them and the wiring between them would help confirm or refute that guess.

Or you could just wait for someone who is intimately familiar with that particular machine to comment. But you should give it at least a day or so before you start getting antsy. I don't think "bumping" posts is all that useful or polite; you're basically saying your need is that much more important than any other message posted to the forum and so deserves to be shown more prominently than any others, which I'm not convinced is true.