Speakers sound too bright.

@bigtwin that web site you shared is intriguing. I have a very challenging listening room - 15’ wide, 24.5’ deep, 6.67’ high (yeah, low ceiling) with a couple of support poles and ceiling beams across the width. And, there is a corner angled in the back. Ignoring the poles and beams, the app suggests cutting the back of my room to about 20.15’, which eliminates the angled corner, nominally giving me a "black zone" set of dimensions!

It’s interesting enough that I am ordering a ceiling rail and thick curtains to see what happens. Thanks for the tip.

BTW Two side-by-side systems:

Eversolo A6 to PrimaLuna EVO 300 Integrated to Klipsch Heresy pair

Roon Nucleus One to McIntosh C53 (DA2 DAC) to MC312 to B&W702S3 pair with REL t/7x pair

You mentioned that your room is 30' x 30'.  How high are your ceilings?  That is a large volume of space.  I think you might find that this has as much-or more-to do with the loudspeaker's interaction with the room, than it does with the loudspeaker itself.  A square room is going to have more pronounced standing wave issues at certain frequencies where they double up, due to the even dimensions.  Go to https://realtraps.com/modecalc.htm and download the ModeCalc and plug your dimensions in and see what you get.  It displays the first 16 axial modes up to 500Hz.  With your dimensions you will see what you are up against and can start making better decisions about what you will want to own. 

I would think it's primarily between your ear and the speakers. If they sound too bright, your ears are telling you what you may not want to hear, no pun intended. I would not tweak anything, but return the speakers. 

Or you can buy and EQ, quickest and cheapest trick.

I purchased a pair of Zu Soul Supremes and had the same issue. I waited for break in and went past the return date. I never got over the fatigue and ended up selling them. Was able to listen to Audio Note e/lx and problem solved. I don’t blame Zu, since I know they make a good product. I think I have sensitive ears is all. Don’t make the same mistake I did and hope they work out. Try to break in and if they don’t get significantly better, return. No shame. 

You need to treat your room. Absorbers for high frequency 

preferrably behind them.  Will help a ton

good luck