Anyone have experience with using de-esser for sibilance in home audio system?

@onhwy61

I would start would the EQ first. Try a parametric and gently scoop out the frequencies that offend.  That could be all you need.  

Good suggestion. Effectively, my question about the rooms is getting at exactly the same cause, but this solution does not require inconvenient changes!

@noromance

It can be associated with tinnatus, apparently.

@erik_squires

Don’t have my headphone amp set up, currently but I do hear it through earbuds.

@bojack

Where is it in your signal chain?

The only time I tried such a product was in my guitar rig and it was really noisy but that was many years ago.

OP:  If you can't hear it via headphones then it's a room issue.

@erik_squires 

I will check when I have time but I'll be astonished if i don't hear it with headphones. 

but I do hear it through earbuds.

This is a problem.

Do you only hear it when a "S" or "SH" is enunciated, or do you hear it thru the entire vocal track?

Does it sound like a very high pitched hissing sound or more like a high pitched ringing sound?