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Speakers near monitors MUST be shielded...specific computer speakers usually are....if you are using non-shielded ones their magnets will colour-distort the screen....and you'll need to degauss....[generally an option in the monitor settings - buttons on front].
If they are unshielded you'll tell...if you move a speaker around in front of the screen [while its on]...and you see a dark shadow on the screen.
If so....move the speakers a foot or so away from the screen...or more....if they are huge ones...[HiFi speakers]....