Belden had some microphone cable that I bought by the 100 foot reel to make interconnects, and somebody paid them to quit making it. That cable was a combination of silver and copper. You start with the wire. Vampire Wire will sell you some good wire,and you can go from there; but you have to have good wire.
I'm not an engineer, I just know what sounds good. If it sounds too good, that company will be paid money to quit making it. "Speakerlab". I think was the name of the company that made good "Klipshorn" knockoffs. Since there was nothing Klipsh could do to stop them, they paid them to quit making the speaker, and that was the end of that story.
These big manufacturers pay people to quit making good stuff, so I suggest you contact "Vampire wire".