Speaker in the DJ booth fed from the mixer's booth output, separate from the main PA.
A booth monitor is a loudspeaker positioned in the DJ booth and driven by a dedicated booth output on the mixer, keeping the DJ's listening volume independent of the main PA system. The DJ controls it with the booth level knob, allowing them to hear the mix clearly without affecting what the audience hears.
Why it matters
A properly leveled booth monitor lets a DJ hear fine details like off-beat transients and filter sweeps without relying on the main room sound, which arrives with a delay due to venue acoustics. Getting the booth level right is one of the first things to sort at soundcheck.

