Silly question, but I’ll ask it anyway.

Just wondering, but can you make an interconnect with spark plug wire?

Why yes, MacGyver, yes you can. But it would be a lot more impressive to make one with pencil and paper. Graphite is conductive, you know. 

Oh wait! I know! What about Wrigley's chewing gum wrappers? Hey, this is fun!

why is or isn’t this done?

Uh, sound quality?

Or. Your could have said the reality of the situation- you just don’t know. Got it

If he just went ahead and said that, then he wouldn’t be his usual charming self...

@last_lemming

Wouldn’t work for interconnects. There is only one conductor covered by a very high voltage rated insulation. You need two conductors for an interconnect. A supply and a return.

Next problem the conductor is usually made of compressed carbon powder. Carbon is not a good low resistance conductor for low signal voltages.
Jim

But a carbon core wrapped in helically wound OFC copper wire (2 per interconnect) that they sell for making spark plug wires might sound pretty sweet. You’d need one heck of a wide plug, though...unless you direct soldered it.