Okay so this is my story. I recently bought a pair of DT770 Premium 250 Ohm's in Hong Kong, at a small discount, I chose these after deciding to not spend so much on the T70 which apparently has a different sound signature. Out of the box, I immediately noticed a small imbalance to the right.
I was driving them out of my iPod touch 4g connected to my Fiio E7 via the LOD. I even tried out the mono audio setting on my iPod and found that the image was slightly panned to the right. Its a very small panning, but very annoying to my ears. When I connected my MDR-1R to the same setup, I didn't get this problem. I tried switching the earcups from left to right ear and vice-versa, but since the drivers are angled, I'm not sure how I can judge using this method. Nevertheless, when I did this, I heard the panning on the left when I switch the earcups. Thus I suppose the fit of the headphones are out of the question. Then, I tried switching sources, I connected them to my MacBook Pro, and still had the same problem; a small annoying imbalance to the right. I tried making my friend listen to them, and he concurred that there is a small imbalance to the right.
My question is, what do you think could be the possible cause for this problem?
Could it be due to an impedance mismatch between the two drivers?
Could the characteristics of my sources also cause this? Like the impedance or voltage? (I really have limited knowledge in this area)
Could this be due to the fact that these headphones have been stored for a long time in the store (plus, they are discontinued), and the drivers developed a mismatch due to ageing? Its a bit rare to find DT770's in stores today.
I am still deciding between exchanging them for a new pair at the store and sending them back to the distributor using my warranty (although I don't know if the warranty still holds for discontinued products).
I would love insights into this, thanks in advance.