Downbeat
Beat 1 of the bar — the strongest hit.
Detailed explanation
The downbeat is beat 1 in a 4/4 bar — the most accented, strongest hit. In electronic music the important musical events (new elements, drops, transitions) almost always land on the downbeat. When beatmatching, beat 1 of track B has to fall on beat 1 of track A — not just any beat onto any beat. In the rekordbox beat grid the downbeat shows up as the more prominent line.
In practice
You hear a track for the first time and do not know where it starts. The downbeat is the hit you nod to involuntarily — usually where the kick lands together with a new element. If you set your cue point on that hit, the track lines up with the one already playing almost by itself. Set it next to the beat and the mix sounds crooked even though both tempos are right — the most common reason a transition feels wrong.
Assessment by the DJLearn editorial team — experience, not a sourced factual claim.
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Where to learn this
Building a DJ set
The guide that covers this topic in depth.
Explained in this phase
Phase 4: Understanding Music for DJs