These seem to work without any issue to replace my failed HD58X cable.
I didn't notice any difference in sound quality. My only concern is their similarity to the previous cord will mean they will also fail - though the couple of years I got from them is adequate.
NewFantasia Replacement Audio Upgrade Cable For Sennheiser HD4.40, HD 4.40 BT, HD4.50, HD 4.50 BTNC, HD4.30I, HD4.30G Headphones 1.2Meters/4Feet
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