— Speaker Coverage · Point source
K-array Mastiff KM312P: SPL & coverage at 12 m
Problem. 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.
Answer. At a 12 m listener position and 60% drive, this preset computes an SPL of approximately 114 dB, comfortably under the roughly 116 dB available at full output from the same distance. The 100 x 30 degree dispersion gives a -6 dB horizontal coverage radius of approximately 14.3 m, which reaches past the 12 m listener with headroom to spare.
02 / In depth
How this preset reads — the engineering view.
The KM312P is rated at 138 dB SPL at 1 m. Because SPL falls with the inverse square of distance, that figure drops fast as the listener moves away: at 12 m and full output the model shows approximately 116 dB, and at the preset's 60% drive level approximately 114 dB reaches the listener position.
The cabinet's 100 x 30 degree (H x V) nominal dispersion is what sets the approximately 14.3 m horizontal coverage radius at -6 dB in this preset. The wide horizontal pattern favours even near-field fill across a room this width, but as a passive enclosure the KM312P depends entirely on a matched amplifier channel to reach its rated output.
Use the planner by dragging the listener distance and drive level sliders and watching the SPL figure move in response. Box count shown alongside is only a front-coverage area estimate; SPL adequacy at a given listener position is a separate check and should be read from the SPL result, not inferred from box count alone.
The planner does not model room reverberation or RT60, coverage zoning across multiple areas of a room, subwoofer pairing or crossover, array mechanical rigging, or DSP and delay-line tuning between cabinets. Those remain separate design steps beyond this single-cabinet SPL and coverage estimate.
What this preset deliberately does not solve
- Figures are free-field inverse-square estimates from the rated 1 m SPL; they do not account for room reflections, absorption, or crowd absorption losses.
- Coverage radius reflects the nominal 100 x 30 degree dispersion figure only; real-world pattern control can vary with frequency and mounting angle.
- This is a single-cabinet estimate; multi-box arrays, delays, and subwoofer integration change the effective coverage and are not modelled here.
How this preset differs from its siblings
Other point-source options in the catalogue carry different rated SPL and dispersion figures, which shift both the safe listener distance and the coverage radius the planner computes. The KM312P's 138 dB rating and comparatively wide 100 x 30 degree pattern suit a wide, single-position live event footprint rather than a narrow-throw or higher-output cabinet, which is why it needs its own preset rather than sharing one with other models.
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
116
dB · target 103 dB · headroom +13 dB
Coverage radius
14.3
metres · -6 dB axis
Quantity
1
boxes for 450.0 m²
A planning link — not a quote.
- model
- K-array Mastiff-KM312P stage monitor
- max spl
- 138 dB @1m
- spl at listener
- 114 dB · max 116 dB
- dispersion
- H 100° · V 30°
- power
- 1200 W applied · 2000 W RMS
- bandwidth
- 60-19000 Hz
- impedance
- 8 ohm
- coverage
- r ≈ 14.30 m · area 642.5 m²
The high-output Mastiff monitor — two 12-inch woofers plus a coaxial 12-inch/2.4-inch section, 138 dB peak with selectable 30°/100° vertical. For loud stages needing a low-profile wedge.
What changes this estimate
- Room drawings & obstructions
- Confirmed ceiling height
- Finishes & absorption in the space
- Final loudspeaker model & dispersion
A planning link — not a quote.
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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.