— Projector Throw · Premium home cinema
BenQ W4000i throw distance & placement (120-inch)
Problem. A premium home cinema built around the BenQ W4000i needs a placement zone that reaches a 120-inch 16:9 screen without pinning the projector to one exact spot on the rear wall or shelf. The zoom lens gives that latitude, but the usable range still has to be checked against the room's actual depth.
Answer. For a 120-inch 16:9 screen (2.66 m wide), the BenQ W4000i's 1.15-1.5:1 zoom range works out to a throw distance of 3.06-3.99 m. That is nearly a metre of front-to-back placement latitude, so a rear shelf, a mid-room stand, or a short-throw-style position closer to the screen can all be made to work with the same unit.
02 / In depth
How this preset reads — the engineering view.
The BenQ W4000i is a zoom-lens projector, not a fixed-throw model, so it does not demand one precise mounting distance. Its 1.15-1.5:1 throw ratio spans 3.06-3.99 m for a 120-inch 16:9 image — meaning the projector can sit anywhere in that band and still fill the screen correctly, with the zoom ring taking up the slack.
At 3200 lumens with a 4LED light source, the W4000i is built for a room where light can be reasonably controlled — evening viewing, blackout curtains, or a dedicated media room — rather than a bright daytime lounge with open windows. Its native 3840x2160 resolution delivers true 4K detail with no reliance on pixel-shifting, which matters most on a 120-inch image where source resolution is easy to see. This combination suits a treated home cinema or media room screen in the 100-135-inch class more than a casual all-day family room.
From this page, drag the screen size slider in the calculator to see the 3.06-3.99 m throw band expand or contract for other diagonals, and check the throw-ratio readout to confirm the W4000i's zoom still covers your actual room depth. Because the range spans nearly a metre, most rooms between roughly 3 and 4 m of usable depth will have at least one valid mounting position.
The calculator confirms throw distance and placement latitude only. It does not decide screen gain or material, ambient-light rejection performance, mount type (ceiling vs shelf vs rear-shelf bracket), the exact optical lens fitted on interchangeable-lens bodies, or the audio system feeding the room — those are separate specification decisions.
What this preset deliberately does not solve
- The 3.06-3.99 m band assumes a flat, perpendicular mounting position; keystone correction is not modelled here.
- 3200 lumens is a light-controlled-room figure; a bright or partially daylit room will need brightness re-checked against ambient conditions.
- Lens-shift range (if any) on this body is not represented in the throw-distance figure and should be checked separately for off-centre mounting.
How this preset differs from its siblings
Other premium home cinema projectors in this class sometimes use fixed short-throw or ultra-short-throw optics with a much narrower placement band, or a longer-throw lens designed for rear-room ceiling mounts only. The BenQ W4000i's 1.15-1.5:1 zoom sits in between, giving close to a metre of placement freedom at 120 inches rather than a single fixed distance — which is why its throw math is worth checking on its own rather than assuming another premium home cinema model's figures apply.
03 / Hydrated calculator
Try the configuration — live.
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Projector Throw Calculator
Pick a projector, set distance or screen size, and see the result instantly. Built for quick decisions before final site review.
A planning link — not a quote.
Lens
Standard Lens
Throw Ratio: 1.15 – 1.50 : 1
Units
Throw Distance
Image Size
Zoom Range
Wide angle to telephoto
Throw distance now 3.52 m
Estimated Image Brightness
257 nits
Comfortable for brighter rooms or smaller screens.
Official product page · reviewed 2026-06-09
Vertical Shift
±60%
Max 90 cm from centre
Horizontal Shift
±15%
Max 40 cm from centre
Viewing Distance
4.96 m
THX 4.09 m
Pixel Density
128 PPD
37 PPI on screen
This combination looks workable for first-pass planning. Final placement still depends on the room and screen.
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