problem
Headphones remove room problems, but they can also hide speaker translation issues.
Headphones can make bass feel detailed and wide without showing how sub energy interacts with a room, car, or small speaker.
That makes it easy to overbuild sub lows or underbuild midrange harmonics that help bass translate.
Compare against a reference at matched loudness and watch whether your low end is much heavier, wider, or peakier than the target.
Mono checks are especially useful because wide bass that feels impressive in headphones can disappear or smear on playback systems.
Trim unnecessary sub energy, keep the deepest lows centered, and add controlled harmonic content if the bass vanishes on smaller playback.
Meter Core helps keep low-end headroom and translation checks grounded when headphones are the main monitoring system.