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You might be interested in downloading REW and running the room simulation. The software is free and you don't need any extra equipment to use the simulation. You can set the room size parameters to match your room and move speakers around to see what sort of dips and bumps in frequency your room/speaker combo might create. I've found it's pretty accurate for predicting bass bumps.
The maths involved isn't all that complicated but it gets easier to calculate the db increase from proximity and standing waves when you've been doing it for a while.
Ok, moved the speakers around a little and a significant improvement. I do still need to think about how I can drive a few more watts through them but am very happy with the change. Considering that audio normally means marginal improvements are eye-wateringly expensive, I’m very happy to have a free sound upgrade. Bigly thanks @danb @ChasnotRobert @BRM