K-array Kobra KK102 I — SPL & coverage in a 30 × 18 m hall

The Kobra KK102 I is rated 126 dB SPL at 1 m. Sound pressure falls with distance under the inverse-square law, so at 15 m and full output the planner shows roughly 102 dB at the listener; dialled back to the 60% drive setting used in this preset, that figure settles to roughly 100 dB — still well above the 85 dB speech-priority target most auditoria design against.

The cabinet's nominal 120° × 35° (H × V) dispersion is what sets the roughly 26 m horizontal coverage radius on the −6 dB axis for this room. The wide horizontal spread suits a broad seating plane, while the comparatively tight 35° vertical pattern keeps the wavefront aimed at the seating bowl rather than the ceiling, reducing slap-back and preserving intelligibility. The Kobra KK102 I is a passive cabinet, so it depends on matched external amplification sized to the box's power handling — the planner assumes correct gain-staging, not a specific amplifier.

Use the planner by dragging the listener-distance and drive-level controls and watching the SPL figure move — that is the direct physics of the inverse-square law playing out per box. The suggested box count is a separate, simpler estimate of front coverage based on room area and cabinet dispersion; treat SPL adequacy and box count as two different questions the tool answers side by side, not one derived from the other.

The planner does not model room reverberation or RT60, so a live, hard-surfaced hall will read a few dB hotter than the figure shown here. It does not divide the room into separate audio zones, does not size or place a subwoofer (the Kobra KK102 I's line-array format targets a defined high-pass crossover point, not full-range coverage on its own), does not account for array rigging, splay angle or mechanical hang points, and does not perform the DSP delay/EQ tuning a commissioned system needs to hit these figures in practice.