You might want to look into fostex drivers I have used many lowthers and to me fostex makes some drivers that are as good or better for much less cash.YMMV
Fostex has better drivers availible than fe168e sig. Which as you found is not as nice as a lowther but I feel fe206esr fe208esig with tweeter or f200a to be equal or better than lowther. But YMMV
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