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It is generally around 7-8k. I’ve found that speaker height and toe in can make a difference. My speakers have level control of mids and highs, and using a calibrated mic and RTA to voice them differently helps a lot. I can reduce that 7-8k range and almost eliminate the sibilance.
A high quality studio de-esser is something I’ve considered as a last resort. I wish more mixers used them effectively. Compression accentuates natural sibilance and some singers have sibilant voices. It can also be accentuated by mastering compression.
OP: A hearing test would be very helpful. In particular, it is possible you have lost hearing everywhere BUT the sibilance range. In that case, instead of lowering the sibilance you may need to raise the surrounding frequencies.
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