> little more attention to threads that you're replying to.  For this particular thread, point taken & now addressed (above). Wrt your comment on 'other thread' :  I don’t engage in circle-J forum protocol.  If the board doesn't want responses to old threads they can close them to response...

Blowing a HD 424 driver is unusual, much more likely you have a bad HD 424 cable. If it hasn't been formally diagnosed by a technician then find someone w/a simple ohmmeter. Wrap a bit of tape around one of the headband stems/legs/(whatever you call them) & label L/R (L-side has either...

FWIW, new yellow-foam ear cushions for your HD 424    (ie: OEM, Prod Code: 019543, UPC: 6-1510419543-1) are at :     http://www.bhphotovideo.com/c/product/116356-REG/Sennheiser_019543_HD424_03_Ear_Cushions.html They have been in biz since 1975 & have a A+ BBB in NY.