How broad is the width of the suckout? If it's narrow you should just ignore it. Bass traps or EQ won't help with narrow band suckouts. Try moving your listening position. Sometimes even a half foot in any direction can help.
Are your speakers running full range? If not then try them full range and move them another foot out from the wall. If your subwoofer is in a corner then you really need to reconsider moving it out into the room for a more even response.
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