I have bought several (different) adapters of this type because of the good reviews. Unfortunately I can not confirm the positive statements. The plugs look good, but are of low quality. The problem is that massive disturbances with me. So I have an adapter (3,5 jack plug to 6.3) between a high-quality headphones (AKG 701) and an equally good headphone amplifier used. At first everything was fine, but one day (or night) I thought my player is defective or incorrectly set (Equalizer), because from the KH was only a dull sound, the centers - and vocals - were barely audible, easy cruel. Because the KH directly on the player but good sound, I now had the KH-amplifier in suspicion. Since I have 2 headphone amplifier, I switched to the second and all was well at first. But after 2 days the same problem occurred again. Only now I examined the cable connection and found out that the contact between earphone plug and socket to blame for the Sound Mash was. I never thought that a poor contact may so express. Both channels were operated, but it is with remarkable damping. As soon as I pushed a little harder to connect into it, turned and so the phenomenon disappeared for a while. What remains is the question of whether I caught only a "runaway" or these adapters are generally so bad. I now test the other, which may take some time, then I add here accordingly. But I have a bad feeling and will treat me now with an adapter (expensive) Neutrik connectors for the main application (the headphone Headphone Amplifier).
