If you're a bit fanatical about channel balance in headphones (no bad thing), then it's great to buy something like miniDSP EARS headphone measuring rig, where you can reliable channel balance measurements. You can then create seperate left/right channel EQ's that match the two channels together exactly throughout the whole frequency range - which essentially means you end up with absolutely perfectly matched channels, which is quite rare to find on any headphone. Yes it costs about £300 to buy the miniDSP EARS but if you're a headphone enthusiast and have quite a few headphones and you've already committed to spending quite a bit on headphones then I think it makes sense. You could also try building your own rig which I've certainly seen one ASR user do. I think it was @peniku8 that built his own so he might be able to give you pointers (sorry @peniku8 if it wasn't you, as I don't know where I delved up that information from my brain!).I myself am no longer sure of this and do not trust these measurements. Now I’m listening, there seems to be no imbalance, I ran the tone with a generator, turned on the downmix channels to mono mode, it seems not, I don’t know what’s wrong anymore, maybe it’s wrong with me, maybe my ear was off that day, and the “measuring setup” confirmed it ... or was there something else in the equipment, in general, could it be that the stereo effects are more pronounced in these headphones? I need to get some more headphones and quickly switch between them.
HD560s does not have enhanced stereo effects. For me the HD560s has very smooth panning of effects that move from left to right, so there's not "3-blob effect" that happens with this headphone. For me HD600 has the "3 blob effect" where it's either left/right or centre, and that headphone doesn't have such smooth transition for panning effects. So to me, I don't think HD560s will make you think it has channel imbalance from that point of view. If you do end up being sure that it has channel imbalance then send it back for a replacement. Also make sure your ears aren't blocked with wax - if you have one ear slightly blocked then it will make headphones more unbalanced than your normal waking life (because no crossfeed).