— Projector Throw · Home cinema
BenQ TK700STi throw distance & placement
Problem. A short-zoom home cinema projector still needs a placement window that matches the room, not just the screen size. For a 120-inch 16:9 image, the question is how much shelf, ceiling-mount, or table depth the BenQ TK700STi actually needs to fill that screen cleanly.
Answer. At a 120-inch 16:9 screen (2.66 m wide), the BenQ TK700STi throws from 2.39 m to 2.87 m. That 0.48 m window is the zoom range on this lens, so the projector can sit anywhere across roughly half a metre of depth and still fill the same 120-inch image.
02 / In depth
How this preset reads — the engineering view.
The TK700STi carries a zoom lens with a 0.9-1.08:1 throw ratio, which is what produces the 2.39-2.87 m range at 120 inches. In practice this means the mount or shelf position does not have to be pinned to a single exact distance: moving the projector anywhere inside that window and adjusting the zoom ring keeps the image at 120 inches, which is more forgiving than a fixed-ratio lens during first fit-out or later furniture changes.
3000 lumens keeps this model in the category of projectors meant for a darkened or dim room rather than one with strong daylight or bright ambient lighting; a 120-inch image at this brightness reads best with curtains, blinds, or a room built for evening viewing. Native 3840x2160 resolution means genuine 4K source detail is resolved on-panel rather than upscaled from a lower native chip, and the lamp light source is a conventional replaceable-lamp engine rather than a laser or LED module, which is a maintenance and running-cost distinction worth knowing before final placement.
From here, use the calculator above to drag the screen size slider and watch the throw distance move in real time: a smaller screen shortens the required distance, a larger one lengthens it, and the 0.9-1.08:1 zoom keeps a usable placement window at every size. Because this is a zoom lens rather than a fixed throw or a lens-shift model, the calculator's placement latitude for the TK700STi will consistently be wider than for a fixed-ratio projector at the same screen size.
The calculator resolves throw distance and placement latitude only; it does not account for screen gain or ambient light rejection, which change how bright the image appears at a given lumen output, nor does it select a ceiling mount, judge whether this specific lens ships on the TK700STi body without variation, or address audio. Those remain separate decisions for the room and installation plan.
What this preset deliberately does not solve
- Throw figures assume a flat 16:9 screen at the stated width; curved, ultra-wide, or masked screens will shift the effective distance.
- 3000 lumens is the rated brightness in ideal conditions; real-world perceived brightness depends on ambient light and screen gain, which this calculator does not model.
- As a lamp-based light source, brightness and colour will gradually decline over the lamp's service life, which is not reflected in the throw calculation.
How this preset differs from its siblings
Where many home cinema projectors in this class use a fixed throw ratio or a narrower zoom band, the TK700STi's 0.9-1.08:1 zoom gives a comparatively wide 0.48 m placement window at 120 inches, useful when exact mount distance cannot be fixed in advance. Its native 3840x2160 panel and 3000-lumen lamp source also place it differently on the brightness-versus-resolution spectrum than laser or lower-resolution alternatives, which is why this model earns its own preset rather than sharing generic home-cinema defaults.
03 / Hydrated calculator
Try the configuration — live.
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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.