Headphone Heights

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It wouldn't be worth the loss if you omitted a resistor...

Posted by EdAInWestOC on July 12, 2017 at 11:28:37:
You definitely want resistors in line to drop the output a bit. You may not need the resistors for the HD-800 headphones but I wouldn't try it on the other headphones.
You also have the problem where you do not want to hook the two negative speaker outputs together. You want a resistor between the negative speaker output and the common negative hookup on the headphone. I believe most amplifiers would balk at shorting the negative speakers outputs together.
Single ended headphones have individual hot connections for the left and right sides but share a common negative hookup. You don't want to try hooking that to your speaker outputs. You may get away with that on some amps but I don't think you want to fry anything. Before you hook the grounds together make sure it won't damage anything.
Ed