I'm having some whistling noise issues with my Stax 407 headphones. I've sent them back to Japan for repair and they found nothing, but the noise remains. Given the nature of the noise I strongly felt the problem was in the phones, but perhaps it's in the 323s driver unit? Anyway if there's anyone out there in Perth, WA with a Stax system to help me do some diagnostics I'd be really grateful, it would possibly avoid some more pointless shipping/waiting.
Thanks in advance!