How to Position the TOUMEI S2 Ultra-Short-Throw Projector: A Measure-Place-Align Checklist

An ultra-short-throw projector can sit close to the screen, but “close” is not a complete installation measurement. Before you choose a console, mark a screen position, or move furniture, you need to separate three things: the optical throw, the projector's physical footprint, and the final image alignment.

For the TOUMEI S2, the safest approach is straightforward: choose the image size first, estimate the lens-to-screen-plane throw, test the projector in the actual room, and use digital image correction only after the physical position is close.

This guide stays focused on that S2-specific task. For definitions, screen considerations, and wider buying questions, read the broader UST laser projector guide.

The quick answer

The S2 specification lists a 0.18:1 throw ratio, a 16:9 aspect ratio, and a manufacturer-listed image range of 60 to 110 inches. Based on those values, the estimated optical throw is approximately:

These are planning estimates, not exact furniture instructions. The available S2 specification does not publish the lens reference point, vertical offset, screen-bottom height, rear-to-wall distance, or a complete installation drawing. Do not read “15.7 inches for a 100-inch image” as “put the back of the projector 15.7 inches from the wall.” It is an estimate from the lens reference to the screen plane.

What you are positioning

This checklist uses the model-specific specification for the S2 Android 13 configuration. The document supports the following facts:

The resolution line above preserves the manufacturer's XPR wording. It should not be rewritten as a claim of native 1080p. The 1000 ANSI figure is also a manufacturer specification, not an independent brightness measurement.

Measure: work backward from the picture

1. Choose a target diagonal within the listed range

Start with a 16:9 image between 60 and 110 inches. Mark the intended image rectangle, or at least its centerline and lower edge, on the actual projection surface. This gives every later measurement one shared reference.

Do not choose the projector position first and hope the picture lands where you want it. With a 0.18:1 throw ratio, a small physical move can produce a noticeable change in image size and position.

If you are still deciding between two screen sizes, mark both outlines with low-tack painter's tape. Sit at your normal viewing distance and compare them before committing to furniture or a fixed screen.

2. Estimate the optical throw

Throw ratio uses image width, not image diagonal:

Estimated lens-to-screen throw = 16:9 image width × 0.18

For a 100-inch 16:9 image, the picture is approximately 87.2 inches wide. Multiplying 87.2 by 0.18 gives an estimated lens-to-screen-plane throw of about 15.7 inches, or 40 cm.

Use the table as a starting marker, then fine-tune with the actual projector and projection surface. The calculation does not include an unpublished distance between the lens reference and the outside of the S2 chassis.

3. Do not mix two measurement reference points

A quoted “distance from the wall” may be measured from the back of a projector, a cabinet edge, the lens, or another point. A throw-ratio calculation normally refers to the lens and image plane. Two distances can therefore describe the same installation and still have different numbers.

Only compare distances when both sources identify the same start and end points. If either reference is missing, keep it as an estimate and verify the final position with the physical projector.

4. Test the product footprint before buying a console

The S2 specification lists overall product dimensions of 300 × 220 × 105 mm. Before ordering a narrow media console, make a simple paper or cardboard template based on the first two dimensions and compare it with the intended support.

Because the source does not label a full installation drawing or the orientation of every dimension, use that template as an initial envelope rather than a guaranteed cabinet plan. Check the actual unit before drilling, cutting, or commissioning custom furniture.

The support also needs to:

• hold the full projector securely;
• support its 1.95 kg net weight;
• leave access for power and source cables;
• keep the projector stable when a cable is connected; and
• avoid blocking any ventilation opening.

The available specification does not state a required ventilation clearance, so do not invent one. Follow the instructions supplied with the exact unit and avoid enclosing it tightly.

5. Mark the unknowns instead of guessing them

Vertical offset determines how high the picture begins above the projector, while the lens reference point determines where the throw-distance measurement starts. The available specification does not provide either measurement.

That matters when a console decision depends on a few centimeters. If the furniture must be made before you can dry-fit the S2, contact TOUMEI with:

• your target screen diagonal;
• the visible screen width and height;
• the intended screen-bottom height;
• the console's width, depth, and height; and
• a side-view sketch showing the wall and furniture.

A model-specific answer based on the current selling configuration is more useful than treating a generic UST diagram as an S2 installation drawing.

Place: make the first dry fit

Once the screen area and starting throw are marked, place the S2 on a stable, level support. Begin with the projector centered on the image centerline and its body square to the screen plane.

Use this order:

1. Place the projector near the calculated starting point for your chosen image size.
2. Connect a compatible power input and your intended video source, leaving the cables relaxed rather than pulled tight. The reviewed specification lists either 19V/3.42A DC input or 20V/3.25A Type-C power input.
3. Display a test pattern or another image with clear horizontal and vertical lines.
4. Move the projector in small physical increments until the image is close to the marked rectangle.
5. Recheck that the projector remains level, centered, and square after every move.

If the top and bottom widths differ sharply, or one side is much taller than the other, return to physical placement before relying on correction. A careful dry fit reduces how much digital geometry adjustment is needed later.

Keep the room conditions realistic

The S2 sheet lists 1000 ANSI as a manufacturer specification, but it does not document a daylight-viewing test. Judge the setup under the lighting conditions you actually plan to use. A larger image spreads the available light over more area, so compare your preferred sizes in the same room rather than assuming the largest listed size will always look best.

Align: correct in the right order

The S2 specification lists TOF laser focus, automatic keystone correction within ±10°, and manual side projection. Use these features after the physical position is close.

1. Confirm the physical position

Check the centerline, level, and angle to the screen again. Move the projector in small increments and reassess the complete frame before changing another variable.

2. Check focus

Use the S2's TOF laser focus, then inspect fine text and detail near both the center and edges. If one region remains noticeably softer than another, recheck the physical angle and projection surface before repeatedly applying digital correction.

3. Apply automatic keystone only if needed

The documented automatic keystone range is ±10°. Treat it as a finishing adjustment within that range, not as a substitute for a suitable projector location.

Digital keystone works by remapping the picture inside the available imaging area. Larger corrections can leave unused borders and use fewer pixels for the visible image. Physical centering and leveling should therefore do most of the work.

4. Use manual side projection for the remaining lateral correction

If the room forces a slight side placement, use manual side projection after the basic position and focus are set. If the result still needs a large correction, move the projector closer to the centerline and test again.

5. Inspect the complete frame

Before accepting the setup, check:

• whether all four corners land where expected;
• whether horizontal and vertical lines look straight;
• whether fine text remains readable across the image;
• whether the projected frame stays inside the intended area;
• whether cables remain accessible without pulling the projector; and
• whether the projector can stay in that position during normal use.

When the result is right, record your own final measurements: chosen diagonal, chassis position, support height, and distance from the support edges. Those room-specific measurements will be more useful when you move and replace the projector than a generic wall-distance claim.

Is the S2 a practical fit for your room?

The S2 may suit your setup if:

• your target image is within the manufacturer-listed 60-110-inch range;
• you want a short optical throw and can verify the final position in the room;
• your support can accommodate the complete projector and its 1.95 kg weight;
• you have practical access to continuous power; and
• you can complete a dry fit before committing to exact furniture dimensions.

The S2 may not suit your setup if:

• you need a projector with a verified built-in battery;
• your required image is outside the documented 60-110-inch range;
• you need an official rear-to-wall distance, vertical offset, or screen-bottom height before any onsite test;
• your planned support cannot hold the projector securely; or
• the room requires a large off-axis correction instead of near-centered physical placement.

The S2 documentation used for this guide lists Type-C as a power input and does not document a built-in battery. It should not be presented as a battery-powered model. It also should not be assumed that the Type-C port accepts video unless the documentation for the exact selling version confirms it.

One-page S2 measure-place-align checklist

Measure

• Choose a 16:9 image size between 60 and 110 inches.
• Mark the planned image rectangle, centerline, and lower edge.
• Use the 0.18:1 throw ratio or the table above for a starting estimate.
• Label that estimate as lens to screen plane, not rear of chassis to wall.
• Test the listed 300 × 220 × 105 mm product envelope on the planned support.
• Confirm the support can safely hold 1.95 kg.
• Plan access for power and source cables.
• Keep console height and wall spacing provisional until the dry fit.

Place

• Put the projector on a stable, level support.
• Center it on the screen centerline.
• Keep the projector square to the screen plane.
• Start near the estimated throw distance for the chosen image size.
• Display a test image with straight edges.
• Move the projector in small increments until the frame is close.

Align

• Recheck the physical center, level, and angle first.
• Use TOF laser focus and inspect both the center and edges.
• Apply automatic keystone only as needed within the documented ±10° range.
• Use manual side projection for any remaining lateral adjustment.
• Inspect all four corners, straight lines, fine text, and frame boundaries.
• Record the final room-specific measurements after alignment.

Common S2 placement questions

How far should the S2 be from the wall for a 100-inch image?

The calculated starting point is approximately 15.7 inches / 40 cm from the lens reference to the screen plane. The available specification does not provide the exact lens reference location or a rear-to-wall measurement, so it would be inaccurate to turn 15.7 inches into a chassis-to-wall instruction. Use it as an optical starting estimate and complete a dry fit.

Can I choose a media console from the throw-ratio table alone?

No. The table estimates optical throw. Furniture fit also depends on the complete product envelope, lens position, vertical offset, cable access, ventilation, and the screen's lower edge. Several of those installation measurements are not provided in the available S2 specification, so verify the actual unit before committing to tight furniture dimensions.

Can the documented S2 configuration run without a power cable?

The model-specific source used here documents Type-C and DC power inputs and does not list a built-in battery. Plan for continuous power and confirm the exact adapter and configuration supplied in your country.

Should keystone correction determine where I put the projector?

Start with physical placement. The S2 lists automatic keystone correction within ±10° and manual side projection, but these are final alignment tools. Centering, leveling, and squaring the projector first gives you a better starting point.

Where can I check the current S2 configuration?

Review the current TOUMEI S2 product listing and confirm the options shown there. This guide uses the optical and physical facts in the S2 Android 13 specification, so compare the configuration shown at purchase time before ordering.

Plan the room, then make the final choice

A useful S2 placement plan does not begin with a guessed wall distance. It begins with the picture size, converts the 0.18:1 throw ratio into a lens-to-screen estimate, checks the full projector envelope, and leaves unpublished offsets for a real-room dry fit.

If that process works in your space, review the TOUMEI S2. You can also compare other TOUMEI projectors, or contact TOUMEI with your target image size and room measurements before making a final choice.