« Last post by thermionix on Today at 06:43:34 AM »
The wiring is easy. The headphone jack just takes a mono signal and copies it to each side of a stereo out. You could either just patch both sides back together into a mono signal, or you could pass one side and ground the other.
I don't think you need to ground anything out, and you're probably over-thinking this. Just take signal from either tip or ring from each Terror. Flip a coin, doesn't matter. And you already know how to combine them at your new, actually stereo, headphone jack.
If you really want to get fancy, you can disengage the ring connections in both amps' headphone jacks, and run standard guitar cables (tip + sleeve only) to your new combiner box.
^ That's assuming the Terrors have 1/4" headphone jacks.