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RE: Having midrange failure issues, anyone else?

The 20.1 use 6um in a push pull magnet structure vs. single ended in the original 20 - they figured they can lower the thickness and double up the magnetic field so would keep power handling roughly the same.

It didn't quite work out that way since the magnet board up front raised air flow resistance so they lost thermal dissipation capacity. For most users that is not an issue. For playback in a really large room it does make a difference - hence the burnt mids..

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