B&W 802D1 - How can I tame the brightness?

There are many types of speakers which can be overly bright; ribbons, horns, etc….. 

One thing to consider is parametric equalization (PEQ) or low pass filters applied in the digital domain before your DAC.
Additionally it's desirable if you can achieve a "Harman tilt" or "Harman target curve" for a more enjoyable listening experience.

We have a video which overviews one way of doing using miniDSP Device Console  
 

@onehorsepony, 

I had the same issue with the entire B&W 800 series line and ended up purchasing Aerial Acoustics some 30 years back and been there ever since.

I would check into other speaker lines and if possible check in room for audition.

Good luck and happy listening!

DeeCee

Did you ever consider contacting PS Audio: Since you own their premiere product, I am sure Paul & his customer service  dept would be most happy to help you.
 

I am not sure how long you have owned the 802D1’s, but it could be you just don’t like them and the issue is not fixable, PS Audio and B&W may not be a good match. your room maybe overly bright. Like everything in audio, there are too many variables.

You don’t say what the rest of your gear is. 
 

b&w’s are highly revealing of components that add noise and distort highs. 

you likely need better gear especially better cables. 

EQ. Acoustic treatments. But different speakers.