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

Right -- I can’t definitively rule that out. They both have lots of glass but as I mentioned, shutting (lined) drapes has no impact. They both have 10.5’ ceilings. Listening near-field with PreSonus monitors.

Believe me, Dave; I’d be very happy if it turned out to not be my ears! But nothing I’ve tried so far has had any effect. I haven’t swapped out the Hegel yet but will tomorrow, when a Heed LaGrange is scheduled for delivery. I’m also considering a Vincent hybrid integrated.

I would be surprised if there is anything wrong with your ears. Does the issue happen with every song that you hear or only with some of the songs?

As far as the de-esser is concerned it could possibly help, as could a parametric e.q. Most de-essers now days are plug-ins so you would need a DAW to be able to use one. The couple of outboard de-essrs that I’m aware of require a special rack to mount them in.

@audiorusty 

Pretty much all vocals. Used to be just female soprano vocals but it's no longer gender-specific. This is one reason I suspect my ears. 

I looked at de-essers on Sweetwater. Some are fully encased and mounted horizontally; others have only front plate and mounted vertically. 

Not interested in software. 

A de-esser is a frequency tuned compressor.  I would start would the EQ first. Try a parametric and gently scoop out the frequencies that offend.  That could be all you need.  Adding the compressor part can be tricky in that many popular compressors have a distinct sound.

Never heard of that as an ear issue. Same distortion in the car? Sure it's sibilance and not resonance?