astrostar59
BannedMember of the Trade: Aries Cerat Espana, Auriculares High-EndAKA Headstage, headphoneweekend
Three plus years of complaints in this forum. Sure sounds like a manufacturing/design defect to me.
As I said in my post, if you look at the incidences of imbalance, there are AFAICS less than 10. And the ones that caused the most agro and thus hand on this thread are from PJ with the after sales issues of sending them back to Japan or not getting an effective repair. Also the fault appears from posts that it becomes apparent a few weeks in, so users with 009s beyond that should be fine. Remember, there are many users of the 009s that hammer them everyday of the week, and no issues reported.
I don't think anyone (inc Stax) managed to work out the cause in the small number of cases reported. It could be air pressure and / or transportation reasons. I would say to anyone thinking of buying the 009s, get them, but buy from your countries dealer network.
On the imbalance thing, there used to be a small number of cases when the 507s came out, but it seemed to sort itself out and AFAIK there were no more reported cases.