I've owned a pair of DT880s going on about 8 years now (ballpark). I received them as a gift and, until now, have never been interested in purchasing an amplifier for them. Unfortunately a few years back the cord going into the left side became loose, and I had to send the cans in to be repaired. When they got back, the usual molding on the jack that gives the impedance of the headphones wasn't there anymore, because they apparently replaced the entire cord. Is there any reliable way for me to figure out the impedance of these headphones? I understand the higher ohmages will be less loud than the lower ohmages with the same power, but any info that's a bit more precise would be helpful.