Use some heatshrink for a cheap and easy solution.
Keep your expectations low with improving the sound of your headphones with wire. Any improvement will be very subtle. A better source or amp will be more dramatic (and cost more of course). The Kapton SPC doesn't look like a good idea. The normal SPC in teflon is stiff and prone to mechanical noise as is. I can't imagine a layer of Kapton helping. Also military spec SPC is probably going to be a waste of time for you if you are trying to get improvements in sound.
As much as I am obsessed with cables and use boutique wire in my builds, I can barely tell an audible difference between my cables. Your best bet for a positive change is to use UPOCC copper or pure silver. Solid core silver of good purity can be purchased for a little over $2 a foot as can very high purity UPOCC copper. If you step to stranded pure silver, it will be out of your price range. Solid silver is usually sold bare, so you will need teflon tubing. Most other wires will come in a polyethylene dialectric which is better for building headphone cables that are to remain flexible.
Y splitters don't impact the sound
The Senn plugs are not easy to deal with, as the plastic melts quite easily. Use as much flux as possible to prep the rhodium. Try to get some solder to flow onto the rhodium before attaching the wire. If you heat the both at the same time, you will likely melt your wire dialectic back unless it is teflon. Watch the angles of your iron so you aren't touching the sides of the connector. You can get plugs for $6.50 a pair from Lunashops. Get a couple sets in case you melt your first attempt.
Good luck!
Keep your expectations low with improving the sound of your headphones with wire. Any improvement will be very subtle. A better source or amp will be more dramatic (and cost more of course). The Kapton SPC doesn't look like a good idea. The normal SPC in teflon is stiff and prone to mechanical noise as is. I can't imagine a layer of Kapton helping. Also military spec SPC is probably going to be a waste of time for you if you are trying to get improvements in sound.
As much as I am obsessed with cables and use boutique wire in my builds, I can barely tell an audible difference between my cables. Your best bet for a positive change is to use UPOCC copper or pure silver. Solid core silver of good purity can be purchased for a little over $2 a foot as can very high purity UPOCC copper. If you step to stranded pure silver, it will be out of your price range. Solid silver is usually sold bare, so you will need teflon tubing. Most other wires will come in a polyethylene dialectric which is better for building headphone cables that are to remain flexible.
Y splitters don't impact the sound
The Senn plugs are not easy to deal with, as the plastic melts quite easily. Use as much flux as possible to prep the rhodium. Try to get some solder to flow onto the rhodium before attaching the wire. If you heat the both at the same time, you will likely melt your wire dialectic back unless it is teflon. Watch the angles of your iron so you aren't touching the sides of the connector. You can get plugs for $6.50 a pair from Lunashops. Get a couple sets in case you melt your first attempt.
Good luck!
