They should be obtainable. I bought the whole multi-pack which comes with a pair of each color (including black, yellow, orange, red, blue - I think that is it) and some posters/stickers. It all comes from Japan, so I don’t think the US has much of a leg-up on these.
Sigh. I guess I’ll go make a 4 pin XLR to 3.5mm adapter (because I’ve changed all SE outputs to XLR plugs).
I know! Now I wish I hadn’t said anything my Koss headphones. I always regret saying stuff.
I will go stand in a corner of Louisiana again.
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If you’re talking about taking the balanced 4 pin XLR output from your amp to convert to the 3.5 SE cable of the Koss, I would recommend against it. Can cause damage to headphone, amp, or both.
You missed what I wrote. I’ve modded all my amps’ SE outputs to XLR plugs. Thanks for looking out though 
Ah, misinterpreted that to mean you replaced your SE amps with balanced ones
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all of them
yes, ofcourse it’s serious
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They’re multiplying!