problem
Stereo bass can lose power when left and right channels are summed.
Wide low end often relies on differences between the left and right channels. When playback collapses to mono, those differences can cancel or change level.
The result can be a bass line that feels huge in headphones but weak, uneven, or distorted on speakers and clubs.
Switch the low end to mono and watch whether level, punch, or tone changes. A correlation meter or goniometer can reveal width that is not translating.
Do not judge only from soloed bass. The kick, bass, synths, and reverbs interact when summed.
Mono the sub range, narrow stereo effects below the crossover point, and use width higher in the spectrum where translation is less fragile.
Meter Core helps connect stereo width choices to mono compatibility and headroom.