— Speaker Coverage · Install line array
K-array Kobra KK102 I — SPL & coverage in a 30 × 18 m hall
Problem. A 30 × 18 m conference auditorium needs confirmed SPL at the rear listener and a defensible horizontal coverage radius before the K-array Kobra KK102 I is specified as the install line-array of choice.
Answer. At a 15 m listener distance and 60% drive, the planner reports roughly 100 dB SPL — comfortably above the speech-intelligibility target — with a −6 dB horizontal coverage radius of about 26 m across the seating plane.
02 / In depth
How this preset reads — the engineering view.
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.
What this preset deliberately does not solve
- SPL and coverage figures are free-field estimates — real rooms with hard surfaces or heavy furnishing will shift the reading, typically upward from reflections.
- The passive Kobra KK102 I needs an external amplifier matched to its power handling; the planner does not select or size that amplifier.
- Box count is a front-coverage estimate only — final array size, splay and rigging require a proper acoustic design pass, not this triage figure alone.
How this preset differs from its siblings
Other install line-array options in the catalogue trade off SPL headroom against physical size and dispersion width differently — a narrower-dispersion column reaches further at the same power but covers less width per box, while a lower-rated-SPL column needs more boxes or closer spacing to hit the same 85 dB speech target. The Kobra KK102 I's combination of 126 dB @1 m rated output and a wide 120° horizontal pattern makes it a strong fit for wide, moderate-depth rooms like this 30 × 18 m auditorium, which is why it earns its own preset rather than sharing the generic install-line-array page.
03 / Hydrated calculator
Try the configuration — live.
The calculator below is preloaded with this preset’s state. Adjust any input — your URL stays shareable.
— Planner · speaker coverage
SPL, coverage radius and quantity, estimated.
Pick a brand, model and application. An indicative free-field SPL at the listener, coverage radius on the -6 dB axis and a planning-level box count for the room — a starting point for design, not a final specification. K-array, KGEAR, JBL Pro, d&b, L-Acoustics, Fonestar, Ecler.
Max SPL at listener
102
dB · target 85 dB · headroom +17 dB
Coverage radius
26.0
metres · -6 dB axis
Quantity
1
boxes for 540.0 m²
A planning link — not a quote.
- model
- K-array Kobra-KK102 I
- max spl
- 126 dB @1m
- spl at listener
- 100 dB · max 102 dB
- dispersion
- H 120° · V 35°
- power
- 240 W applied · 400 W RMS
- bandwidth
- 150-18000 Hz
- impedance
- 8 ohm
- coverage
- r ≈ 25.98 m · area 2120.6 m²
The one-metre Kobra — sixteen 2-inch drivers, Spot/Flood from 7° to 35° vertical, 126 dB peak. EN 54-24 certified stainless column for larger auditoria, transport halls and houses of worship needing both intelligibility and evacuation compliance.
What changes this estimate
- Room drawings & obstructions
- Confirmed ceiling height
- Finishes & absorption in the space
- Final loudspeaker model & dispersion
Feasibility
102 dB max at the listener carries 17 dB over the 85 dB target — comfortable headroom; a smaller cabinet may be more cost-effective.
A planning link — not a quote.
· Other presets for speaker coverage planner
Speaker Coverage · Hospitality
Hotel lobby — background music, 20 × 12 m
A premium hotel lobby needs even, conversation-friendly background audio at 70–75 dB without ceiling speakers that visibly puncture the architecture.
Speaker Coverage · Auditorium
300-seat conference auditorium — speech-priority line array
A 300-seat corporate auditorium needs 85 dB of intelligible speech at the rear row with even SPL across the seating bowl and minimal visual impact.
Speaker Coverage · House of Worship
500-capacity house of worship — touring-grade headroom
A 500-capacity worship space needs 90 dB of headroom for music programme plus speech, even coverage across pews and a system that won't be the visual subject.
Speaker Coverage · Touring line array
L-Acoustics K2 touring line array — SPL & coverage
A 40 x 25 m live event space needs confirmed SPL at the furthest listener position, not just a box count, before the touring line-array design is locked. The decision that matters here is whether the rated output of a single K2 element, once distance and drive level are accounted for, actually clears the target at the back of the room.
Speaker Coverage · Install line array
L-Acoustics A15 Focus — SPL & coverage in a 30 × 18 m hall
A 30 × 18 m conference auditorium needs confirmed SPL at the furthest listener before committing to a passive install line-array cabinet, and needs to know how far its horizontal pattern actually reaches before spacing hangs across the room.
Speaker Coverage · Touring line array
d&b audiotechnik V8 — SPL & coverage for live events
A 40 × 25 m live-event space needs confirmed SPL at a 20 m listener position plus a defensible horizontal coverage figure before a touring line-array cabinet is committed to the rig plan.
Speaker Coverage · Install line array
d&b audiotechnik Y8 SPL & coverage
A 30 x 18 m conference auditorium needs enough level at the back rows without over-driving the front seats or spraying sound onto side walls. The d&b audiotechnik Y8, an install line array cabinet with a narrow 80 x 10 degree dispersion, is a common candidate for this kind of long, level-critical throw.
Speaker Coverage · Install line array
JBL Professional VRX932LA-1 SPL & Coverage
A 30 x 18 m conference auditorium needs enough clean SPL at the rearmost listener without the horizontal pattern spilling wastefully past the seated area. The JBL Professional VRX932LA-1 is a passive install line-array cabinet, so the coverage decision has to weigh its rated output headroom against room depth and driven level together.
Speaker Coverage · Install line array
JBL Professional SRX906LA — SPL & coverage, conference hall
A 30 × 18 m conference auditorium needs dependable SPL at a 15 m listener position without over-driving the cabinet or lighting up the side walls with excess horizontal spill.
Speaker Coverage · Point source
JBL Professional Control 25-1: SPL & coverage
A 20 x 12 m restaurant relying on background music needs a cabinet that stays intelligible at a 6 m listening distance without overpowering nearby tables. The real decision is whether the Control 25-1's rated output and dispersion give adequate SPL at that distance once drive level is set for comfortable background listening rather than full output.
Speaker Coverage · Steerable column
JBL Professional CBT 70J-1 — SPL & coverage
A 20 × 12 m house-of-worship hall needs even, intelligible coverage out to a 12 m listener without a visible line-array or a forest of ceiling speakers. The design question is whether a single steerable column can hold usable SPL at the back of the room while keeping its vertical pattern off the ceiling and walls.
Speaker Coverage · Ceiling 100V
JBL Professional Control 26CT: SPL & coverage
A 15 x 10 m restaurant relying on background music needs to know whether a single ceiling cabinet keeps speech-and-music levels comfortable at typical table distances, not just how many boxes fit the floor plan on paper. The Control 26CT's rated output and dispersion answer both the SPL-adequacy question and the physical coverage-radius question for this specific cabinet before layout is finalised.
Speaker Coverage · Install line array
K-array Python KP102 I: SPL & Coverage
A conference auditorium roughly 30 x 18 m needs predictable speech and programme coverage to the back rows without over-driving the front seats. For a passive install line array cabinet such as the Python KP102 I, the real design question is whether its rated output and dispersion can hold usable SPL out to the furthest listener while the horizontal pattern still matches the room width.
Speaker Coverage · Point source
K-array Domino KF212: SPL & Coverage Preset
In a 25 x 18 m live event space, the practical question is not just how many Domino KF212 boxes to hang but whether the SPL reaching a listener at 12 m still lands in a usable range once drive is pulled back from full output. The 90 deg x 60 deg dispersion also has to be checked against the room's width before assuming a single hang covers the floor edge to edge.
Speaker Coverage · Point source
K-array Lyzard KZ1 I — SPL & coverage
A 20 x 12 m restaurant dining room needs even background-music coverage without the cabinet becoming a visual or acoustic distraction at the table. The real decision is whether a compact point-source cabinet like the K-array Lyzard KZ1 I can hold a comfortable listening level out to the far tables at a sensible drive setting.
Speaker Coverage · Touring line array
K-array Firenze KH8 SPL & coverage
A touring line-array cabinet has to hold intelligible level across a large live-event floor without over-driving the box or leaving the back rows short. For a 40 x 25 m room, the real question is not just ”will it get loud enough” but whether the rated output and the 120 x 30 degree pattern still deliver usable SPL and width at the listener position that matters most.
Speaker Coverage · Point source
K-array Tornado KT2: SPL & coverage at 6 m
A 20 x 12 m restaurant relying on background music needs the loudspeaker's rated output to translate into usable, even level at the listener's seat, not just at the cabinet face. For the Tornado KT2, a compact passive point-source box rated 100 dB SPL at 1 m, the real question is what level and coverage radius it actually delivers once distance and drive level are factored in.
Speaker Coverage · Touring line array
K-array Mugello KH5: SPL & Coverage for Touring Rigs
A touring line array cabinet like the Mugello KH5 has to hold usable SPL across a large live-event floor while its horizontal and vertical dispersion decide how many listener positions actually stay inside the pattern. In a 40 x 25 m room, the real question is not just ”is it loud enough at the mix position” but whether the -6 dB coverage angle actually reaches the back and sides of the floor without over-driving the box.
Speaker Coverage · Install line array
K-array Vyper KV102 II — SPL & coverage
A 30 x 18 m conference auditorium needs speech-priority coverage that reaches the back rows without spraying sound onto the ceiling or side walls. The Vyper KV102 II is an install-grade passive line array cabinet, so the real design question is whether its rated output and dispersion can hold usable SPL out to a 15 m listener while its narrow vertical pattern keeps the throw controlled.
Speaker Coverage · Point source
K-array Mastiff KM312P: SPL & coverage at 12 m
A single K-array Mastiff KM312P point-source cabinet is being considered to cover a 25 x 18 m live event space from one flown or stacked position. The real question is whether its rated output and dispersion still deliver an adequate level at a listener 12 m out, not just at the mix position.
· Next
Brief us on the project — with this configuration.
Presets are a typology starting point. The brief wizard captures the room geometry, programme and constraints we need to translate this configuration into a real design.