Originally Posted by palmfish
Wood is a poor conductor. Plastic is a poor conductor.
As long as the conection is made with some kind of metal, it will conduct with no loss of quality. It will sound the same as if there was no connector in the signal chain.
Be careful. "poorly made" adapters can absolutely affect the sound quality. But it would have to be pretty bad to where the connection of audio signal isn't 100% consistent. Imagine a pair of headphones where the right ear starts to "go out". Sometimes it can crackle before it drops out completely or sound thin, or other traits. So, while it isn't really the adapter itself, but rather if the adapter isn't made very well. As long as it is reasonable build quality the copper shouldn't matter.
When I mentioned the cables before affecting the sound, adapter or not, if you change the cables you can affect the sound. Different cables "might" alter the resistance and this change in impedance absolutely affects almost all balanced armature in ear monitors. Probably not a lot, because you would need a significant change to notice it, but when a lot of people rave about super cable upgrades, what they are sometimes hearing is actually more bass or treble due to impedance changes. This varies, but unless I missed something, if the purpose here is to change cables you "might" change the sound, but probably not much either way.
Edited by luisdent - 5/16/13 at 1:59pm