Glasses and hat will change what you hear too.
I go for full blown laser alignment with 4 columns. 2 mains, 2 MB columns
From the seated position to the center of the columns. Measure that distance, pushing it away lowers the db to that ear. I run mine the same distance
Camber
Caster
Toe-in or out.
The mains are toed-in and fire in front of the seated position. They are tipped back 5 degrees, with the ribbon tweeter turned horizontal vs vertical.
The MB columns fire behind the seated position and are tipped back less than 5 degrees. They are outside the monitors and 12-24" closer but 60 degrees off axis from the monitors. They don’t interfere with the monitor imaging either. You also push the MBC back about 1" inch at a time, until the timing is right between the monitors and MB columns.. To close boomy, to far away they loose coherence. They sound like they are in separate boxes.. Just what I didn’t want to do..
You really want to zero in your speakers, use a laser and a db meter in the seated position..
Your ears just make sure they are pretty close. That set up can compensate for a lot of hearing issues too between moving a single column forward or backwards but keeping the laser in the same spot for imaging..
Regards