— Speaker Coverage · Install line array
JBL Professional SRX906LA — SPL & coverage, conference hall
Problem. 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.
Answer. At 60% drive the JBL Professional SRX906LA delivers roughly 108 dB SPL at a 15 m listener, comfortably inside its 134 dB @1 m rating with headroom to spare. Its 120° × 15° dispersion supports a -6 dB horizontal coverage radius of around 26 m across the room.
02 / In depth
How this preset reads — the engineering view.
The SRX906LA is rated 134 dB SPL at 1 m. SPL falls with distance under the inverse-square law: at 15 m and full output the planner returns roughly 110 dB, and at the preset's 60% drive setting that eases to roughly 108 dB at the listener — well above the intelligibility floor for a conference room this size, with margin left in the cabinet.
The 120° x 15° (H x 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 plan, while the tight 15° vertical pattern keeps the wavefront off the ceiling and floor, controlling throw and reducing the reflections that erode speech clarity. The cabinet is self-powered, so the planner's drive-level input maps directly to the box's own amplification rather than an external amplifier channel.
To use the planner: drag the listener distance and drive-level sliders and watch the SPL figure move in response. Box count is a separate, front-coverage estimate derived from room area and dispersion — it tells you how many cabinets are needed to blanket the floor plan, while the SPL reading is the separate feasibility check confirming the chosen cabinet and drive level actually reach the listener at an adequate level.
The planner does not model room reverberation or RT60, so a hard-finished conference hall will read louder and less intelligible in practice than the raw SPL figure suggests. It also does not handle zoning across separate seating areas, subwoofer pairing for programme material below the cabinet's low-frequency roll-off, array mechanical rigging, or the DSP/delay tuning that a commissioned system would apply.
What this preset deliberately does not solve
- SPL figures assume free-field inverse-square propagation only — no reverberant-field or RT60 correction is applied.
- Box count is a front-coverage area estimate, not a substitute for a measured or simulated design (EASE / MAPP / SoundVision).
- Subwoofer pairing, array rigging and DSP/delay alignment are outside the planner's scope and need a separate design pass.
How this preset differs from its siblings
Other install line-array options in the catalogue trade SPL headroom and dispersion shape differently: a narrower vertical pattern reaches further with less floor spill, while a wider horizontal pattern (as here) favours broad seating plans over long throw. The SRX906LA's 134 dB @1 m rating and 120° x 15° dispersion sit it firmly in the speech-priority, wide-room category rather than the long-throw, narrow-beam end of the line-array range — this preset exists to show that specific balance in a 30 x 18 m conference layout rather than a narrower hall where a tighter-dispersion cabinet would be the better fit.
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
110
dB · target 85 dB · headroom +25 dB
Coverage radius
26.0
metres · -6 dB axis
Quantity
1
boxes for 540.0 m²
A planning link — not a quote.
- model
- JBL Professional SRX906LA powered line array
- max spl
- 134 dB @1m
- spl at listener
- 108 dB · max 110 dB
- dispersion
- H 120° · V 15°
- sensitivity
- 98 dB @1W/1m
- power
- 360 W applied · 600 W RMS
- bandwidth
- 63-17000 Hz
- impedance
- active
- coverage
- r ≈ 25.98 m · area 2120.6 m²
Dual 6.5-inch powered line array — Class D + DSP + LevelMax limiting. Three-point rigging, HARMAN HControl Ethernet. Contemporary touring/rental cabinet.
What changes this estimate
- Room drawings & obstructions
- Confirmed ceiling height
- Finishes & absorption in the space
- Final loudspeaker model & dispersion
Feasibility
110 dB max at the listener carries 25 dB over the 85 dB target — comfortable headroom; a smaller cabinet may be more cost-effective.
A planning link — not a quote.
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· 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.