Beyer M380
141JohnnySomersett: To my best knowledge, the DT880 had a different capsule, but I might be wrong, as there were a few variants built over the years. The 600 ohms tests ca. 570 ohms with the multimeter. Look for pictures on the net to compare with what you got. If anybody wants I post highres pics of the capsule we all like.If you get the headphones, try them at first with low frequency sine waves. If they pass this test, you can pull off the ear cushions, remove the ring aroung the perimeter carefully with a screwdriver and then you can open the cans. The capsules are sitting in a kinda nest, some are fixed with glue as well, others just held by clamps. Desolder the two wires. Get rid of the glue, make sure no crumbles fall into the back of the capsules. Pry the clamp apart, pull the capsule out. Hold the front/membrane close to a good light, look for small hair and dust/crumbs - these will make a buzz if they remain on the capsule. Now if you solder the capsule to the wires of your mic, the right one should be +, in the headphone it's the other way round. I think because a positive voltage is pushing the membrane towards you, whereas the same sound would push the membrane (if it's acting as a mic) inwards. Somebody correct me if I'm wrong. So far I have gone through a number of old headphones and nearly everyone failed the sine wave test, that means dirt/dust/hair either in the magnet gap or behind the membrane. If it's ON the membrane, you can clean it. If it's not too bad, you could still use it for kickdrum and maybe get away with it, but on bass amp you will get a "kchzzzz" on clean tones, at least on the attack and loud notes, it depends.