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WTB Driver for Koss A-250

Will Ship To: Anywhere

I have a pair of Koss A-250s with a buzzing left driver.  I bought them last year, new in the blister pack, and they've done it since being opened.  I replaced the earpads and foams with new ESP-950 ones from Koss, but I'm afraid to send them in for service as I've heard of this model being replaced with brand new ones that aren't as good.  I've taken them apart and blown the driver out, but I didn't see any debris there anyway.  Anyone out there have a troubled pair with a side that doesn't buzz?  Anyone know what other models the same driver could be robbed from?  These actually sound pretty great aside from that buzz, and I'd like to make them usable without excuses.