I did some checking and you can tell the 68 ohm from the 50 ohm versions by the serial number and weight.
68 ohm 2204122xx 512 grams 9 digit S/N
50 ohm 220423xx 510 grams 8 digit S/N
They are definitely two different versions denoted by serial number under the pads. 9 digits for the 68 ohm and 8 digits for the 50 ohm. They're cosmetically identical, the driver cover when the pads off are identical too. I have an accurate postal scale, so the 68 ohm is 2 grams heavier. These are both new, so I'm guessing it's the drivers to cause the weight difference. I've got another one coming in this week to check out, have to remove the pads anyway to register the warranty. I tested with the same factory cable on each just for consistency. Going to check and see if any other their other models have this ohm rating on their drivers.
The ones Amirm measured have the ski style headband, and these are the V2 with the bar style one. I'll ask Monday, I have a contact at Hifiman and see if they know the difference in drivers, like if one is an earlier production model.
68 ohm 2204122xx 512 grams 9 digit S/N
50 ohm 220423xx 510 grams 8 digit S/N
They are definitely two different versions denoted by serial number under the pads. 9 digits for the 68 ohm and 8 digits for the 50 ohm. They're cosmetically identical, the driver cover when the pads off are identical too. I have an accurate postal scale, so the 68 ohm is 2 grams heavier. These are both new, so I'm guessing it's the drivers to cause the weight difference. I've got another one coming in this week to check out, have to remove the pads anyway to register the warranty. I tested with the same factory cable on each just for consistency. Going to check and see if any other their other models have this ohm rating on their drivers.
The ones Amirm measured have the ski style headband, and these are the V2 with the bar style one. I'll ask Monday, I have a contact at Hifiman and see if they know the difference in drivers, like if one is an earlier production model.
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