JBL Professional Control 25-1: SPL & coverage

The Control 25-1 is rated at 116 dB maximum SPL at 1 m. Because sound pressure falls off with the inverse square of distance, that figure drops to roughly 100 dB at 6 m when the cabinet is driven at full output, and to roughly 97 dB at 6 m when drive is reduced to 50 percent for a background-music level.

The cabinet's 100 degree by 100 degree nominal dispersion (H x V) sets a horizontal -6 dB coverage radius of approximately 7.2 m in this scene. The wide, even pattern favours near-field fill over long throw, which suits a room where listeners sit close to the cabinet rather than across a long hall. Being a passive design, the Control 25-1 needs a matched amplifier channel sized to its rating rather than built-in powered electronics.

Use the planner by dragging the listener-distance and drive-level controls to watch the SPL readout move in real time. The box-count suggestion is a front-coverage estimate based on dispersion angle and room geometry; SPL adequacy at the listener position is a separate check the planner runs alongside it, and both should be read together before settling on a layout.

The planner does not model room reverberation or RT60, so a hard-surfaced dining room will sound louder and less clear than the SPL number alone suggests. It also does not handle zoning across separate areas, subwoofer pairing for low-frequency reinforcement, mechanical rigging for arrays, or DSP and delay-line tuning between multiple cabinets — all of these remain judgement calls for the room design stage.