Mono Compatibility: Why Your Phone Matters

Many listeners hear music on phones or on single Bluetooth and smart speakers, which play in mono (so do some venue systems).

Many listeners hear music on phones or on single Bluetooth and smart speakers, which play in mono (so do some venue systems). Phase issues can make parts of your mix vanish on those systems.

When a stereo signal is summed to mono (as phones, single Bluetooth and smart speakers, and some venue systems do; most car systems and club PAs are stereo), the left and right channels combine. If they contain out-of-phase frequencies - signals that are "opposite" in each channel - those frequencies cancel out and disappear. Bass is especially vulnerable.

Common causes of phase issues Excessive stereo widening plugins in the mix Poorly recorded stereo sources (room mics, drum overheads) Heavy ping-pong delays or extreme panning Synth patches with stereo detuning or unison spread

Tip: Quick test: play your mix on your phone speaker. If the bass disappears or the track sounds thin, you have a phase problem to fix in the mix. LoudCraft's spatial engine is mono-safe by design, but it can't fix pre-existing phase issues in your source.

Key takeaway: LoudCraft checks mono compatibility automatically. If it flags an issue, reduce spatial intensity or fix phase problems in your mix.