longbowbbs, but a lot of people claim that balancer armatures does not burn-in.
Yes they do. I am no scientist. However, Many of us have found that the JH16's improve after some time on them. I have no idea why. However, IMO mine did open up after about 150 hours or so. The mids and highs caught up with the extra bass to make a more coherent sound signature. I have quit debating with the other people and just enjoy my JH16's. YMMV.