problem
Imagers can create width by changing phase, level, or side energy, which may reduce correlation and weaken mono playback.
A stereo imager may raise side level, delay one channel, or alter phase relationships. Those moves can sound impressive in stereo while reducing the shared center information.
Low end, reverbs, and doubled parts are especially sensitive because phase changes can cancel when summed to mono.
Toggle mono and monitor correlation as you adjust width. If important elements drop, blur, or shift, the widening move is too dependent on phase difference.
Compare the imager at matched loudness so extra side level does not disguise a weaker center.
Keep kick, bass, lead vocal, and low-frequency content stable in the center. Use narrower settings, frequency-limited widening, or arrangement choices instead of widening the full mix.
Meter Core keeps stereo correlation visible while you balance width against mono compatibility.