I am looking into buying another pair of headphones (maybe two) and I plan on using them with my current ones, a pair of Sennhieser HD555s. My main mode of listening is my computer with an Asus Xonar ST soundcard, but I would like to get an extension cable for the 6.3mm jack, since the port is in the back and having an extension cable run towards the front of my computer so I can swap between headphones easily.
Would using an extension cable notably lessen the quality of sound? If not, do you guys have any recommendation for 6.3mm extension cables? I'm a bit skeptical about this since a lot of the 3.5mm extensions I've used were of sub-par quality.