Sorry if I duplicate a response form someone else, but a lot depends on which LD you're talking about. Acoustical transparency of the capsule itself is at the heart of it. If the headgrille traps high frequencies within the capsule and they create standing waves at high frequencies, the sound capture is compromised. More transparent headgrilles allow the escape of this HF energy. That in itself solves a lot of problems. How transparent must the headgrille be then becomes the point.
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