When Fostex moved its Taiwan production to China, I noticed the drivers that where now made in China tested off. Some had quality control problems. Once Fostex sent a rep to test drivers at distributor. They rejected a few. But since I have not found any of the more costly fostex drivers to be out of spec. Sure fe126e fe166e sometimes measured off but not f200a fe208esigma t500a2 d1400 all the large woofers. If you have the time which models where off when you tested? I will mention to fostex rep next time I see him.