6 February 2009
Packaging on fakes is really good now, outward appearance is hard to tell if fake or not. Best way is to test the resistance of the headphones. Sony state 16 ohms and sound great, the fakes are 31 ohms and sound crap. Use a test meter to measure the resistance from the gold plated plug end, positive (red lead) on the tip and negative (black lead) on the largest gold area closest to the plastic moulding. Anywhere from 16 - 19 ohms original Sony, above or closer to 31 ohms or higher guaranteed fakes.