— Speaker Coverage · Install line array
JBL Professional VRX932LA-1 SPL & Coverage
Problem. 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.
Answer. At a 15 m listener position and 60% drive, this preset resolves to roughly 104 dB SPL, comfortably inside the cabinet's rated 130 dB @1 m envelope. The 100 deg x 15 deg dispersion gives a -6 dB horizontal coverage radius of about 17.9 m, which spans the 18 m room width from a centred hang.
02 / In depth
How this preset reads — the engineering view.
The VRX932LA-1 is rated 130 dB maximum SPL at 1 m. Because SPL falls off with the inverse square of distance, that headroom drops to roughly 106 dB at 15 m when driven at full output, and to roughly 104 dB at 15 m at the 60% drive level set in this preset.
Its nominal dispersion of 100 deg horizontal by 15 deg vertical is what sets the approximate 17.9 m horizontal coverage radius at -6 dB in this scene. The narrow vertical pattern concentrates energy along the throw distance and keeps the beam off the ceiling and rear wall, reducing reflected energy back into the room. As a passive cabinet, the VRX932LA-1 needs a matched external amplifier channel sized to its power handling; it has no onboard amplification of its own.
Use the planner by dragging the listener distance and drive level sliders and watching the SPL readout move with them. The box-count suggestion is a front-coverage estimate for spreading pattern across the room width; whether the resulting SPL is actually adequate at the listener position is a separate check the planner reports alongside it, not the same question.
This planner does not model room reverberation or RT60, so it will not tell you whether a hard-surfaced auditorium adds unwanted reflected energy on top of the direct SPL shown. It does not zone SPL across separate seating areas, does not account for subwoofer pairing or crossover, does not model array mechanical rigging or splay angles, and does not include DSP delay or EQ tuning across an array.
What this preset deliberately does not solve
- SPL figures are inverse-square estimates from the rated 1 m sensitivity, not a full room acoustic simulation.
- The -6 dB coverage radius assumes a single cabinet's nominal dispersion pattern and does not account for arraying multiple boxes or mechanical splay.
- Actual measured SPL and coverage will vary with mounting height, aim angle, room surfaces, and amplifier gain structure on site.
How this preset differs from its siblings
Other install line-array cabinets in the catalogue carry different rated 1 m SPL figures and different horizontal/vertical dispersion pairings, both of which shift the coverage radius and the achievable SPL at a given listener distance. The VRX932LA-1's 100 deg x 15 deg pattern and 130 dB rating produce a specific coverage-versus-drive trade-off for a 30 x 18 m room that will not match a cabinet with a wider vertical pattern or a lower rated output, which is why this cabinet has its own preset rather than sharing one with the rest of the line-array family.
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
106
dB · target 85 dB · headroom +21 dB
Coverage radius
17.9
metres · -6 dB axis
Quantity
1
boxes for 540.0 m²
A planning link — not a quote.
- model
- JBL Professional VRX932LA-1 passive line array
- max spl
- 130 dB @1m
- spl at listener
- 104 dB · max 106 dB
- dispersion
- H 100° · V 15°
- sensitivity
- 95 dB @1W/1m
- power
- 480 W applied · 800 W RMS
- bandwidth
- 57-20000 Hz
- impedance
- 8 ohm
- coverage
- r ≈ 17.88 m · area 1003.9 m²
12-inch two-way passive line-array element — arrays of up to six. Constant-curvature for portable/rental and small-venue install.
What changes this estimate
- Room drawings & obstructions
- Confirmed ceiling height
- Finishes & absorption in the space
- Final loudspeaker model & dispersion
Feasibility
106 dB max at the listener carries 21 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.