Speakers or room

Have you tried putting in four or five large leafy plastic plants?  Scatter a few of them around the room, particularly along the wall behind and between the speakers.  The leaves act as small diffusers.  Works well for me.  And it's 1/10th the price of audio diffusers and sound absorption accessories.

if you want better sound just upgrade the speakers. 

You’re screwed, big throw rug with padding beneath, heavy drapes you can close when listening, subs to compliment the speakers might have you playing back at lower volume which can tame the reflections. 

@kenjit   C'mon, one doesn't need to go 'stone cold' on the OP...he Knows he's got 'issues'...:(

Better...Rugs, drapes, plants, anything to damp the echos down...
...and keep the spouse in a 'happy place'. *S*  She might welcome an opportunity to decorate with your *ah* 'guidance'... ;)

New speakers can come later...they may be about the same amount of $ in the end as the decor but they're more likely to be tolerated 'better' later....

(After nearly 40 years, one learns how to approach such....*L*)

GIK is a good call, but....won't be as acceptable as nice fluffy rug...