I have a braided 25ft Ernie Ball cable that I decided was just too long for what I needed, so I cut it and made it into two cables using REAN silent jacks. The cable is a twin core cable with a braided shield - this is the closest image I can find.
After soldering, the cable is noticeably lacking volume and high-end. Before I take it apart and try something different, is there any advice on what the correct way to connect the two cores?
I haven't found any information about soldering dual core cables to guitar jacks- all the information I've found is for single core cables. I had found someone else that had done this, as described in this comment on Amazon https://www.amazon.co.uk/gp/customer-reviews/RSIPNZK0HCXC3/ref=cm_cr_arp_d_rvw_ttl?ie=UTF8&ASIN=B07N6V5WRG
I bought the 25ft version and a pair of Rean NYS224S silent jacks for a fiver on eBay, cut the cable into a 10ft and 15ft section and soldered the new jacks on the ends. For £30 I now have two fantastic quality cables both of which allow silent instrument changes. Highly recommended!
Note that these cables are twin core shielded and one of the cores is connected to ground with the shielding so you’ll need a multimeter to know which core to connect to the tip and which one goes to the sleeve of the jacks.
I did what is described in the comment, found the core carrying the signal and soldered it to the tip, and soldered the other to the sleeve with the shielding. I'm wondering whether this is creating a ground loop or something, but want to understand why it's happening and how to fix it before pulling it all apart again. Thanks in advance.