Planar B&G RD40 protection circuit

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Hi there!
I have a question? I got me a pair of B&G RD40. Now I read that there should be a loudspeakerprotection circuit on the speakers, because otherwise the planar can be easely destroyed bij DC from my pass labs aleph 5 when something is going wrong. They were talking about a transformer in series. But doesn't that influence the sound? Thanks Teake.
 
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