LG CineBeam S (PU615U) Ultra Short Throw Projector Review

The CineBeam S represents LG’s ongoing effort to merge advanced projection technology with modern living trends that prioritize flexibility and design. While many 4K projectors still require several feet of throw distance and dedicated mounting, the CineBeam S eliminates those constraints with its ultra-short-throw optical system.

The projector can display a 40-inch image when placed just 3.2 inches from the wall, and a 100-inch picture from only 15.5 inches away. This capability allows the projector to be positioned directly in front of the viewing surface, freeing users from complex ceiling installations or the need for long cable runs.

Like LG’s smaller CineBeam Q (HU710PB), the CineBeam S employs a 4K UHD (3,840 x 2,160) imaging system that uses XPR pixel-shifting technology to achieve over 8 million addressable pixels on-screen. It utilizes an RGB laser light source that provides rich color reproduction and wide coverage of the DCI-P3 color gamut—up to 154 percent—making it suitable for viewing HDR content with vivid color accuracy.

The projector is rated at 500 ANSI lumens of brightness, which is comparable to other compact projectors in its class and sufficient for dark or moderately lit environments. A dynamic contrast ratio of 450,000:1 enables it to display deep blacks and maintain separation between bright and dark image areas.

Visually, the CineBeam S continues LG’s minimalist design approach. It’s compact 4.3-by-6.3-by-6.3-inch housing weighs just over four pounds and features a metallic finish that integrates cleanly into a variety of room settings. The projector’s aesthetic focus reflects LG’s intent to treat it not only as a piece of technology but also as an unobtrusive design element. The small footprint and cube-like form factor make it easy to place the projector on a shelf, coffee table, or media stand, and just as easy to move it from one location to another.

Feature and performance-wise, the new CineBeam S is be nearly identical to the award-winning CineBeam Q. The notable difference is the CineBeam S has an ultra-short-throw lens system, so the unit can project a large image even when positioned very close to the projection surface. The projector produces a 40-inch diagonal picture from just 3.2 inches away, and from 15.5 inches, it can deliver a 100-inch picture.

Since the PU615U supports USB power delivery, you can power the projector with a USB battery bank that can deliver at least 20V/5A (100 W). This feature lets you use the projector virtually anywhere, even though it doesn’t have a built-in battery. You can use the second USB-C connection to play content (video, music, or photos) stored on a USB stick or hard drive. Wireless options include Wi-Fi, Bluetooth, and compatibility with LG’s ThinQ smart ecosystem for voice control and app-based operation.

The unit’s remote control has all the buttons you would expect on a projector remote control. Some of the projector's buttons include Power On/Off, Settings, Volume, Mute, D-pad with an "OK" button, Back, Homepage, and Input Source. There are dedicated buttons to switch picture modes, access installation features, and quickly access popular video streaming services.

The PU615U’s ultra-short-throw optical engine defines its physical layout and performance. The lens assembly is positioned at the top front of the chassis, directing light upward at a steep angle to create a large projected image on a nearby wall or screen. The projector can display image sizes ranging from 40 to 100 inches with projection distances between 3.1 and 15.4 inches. The upward projection ratio of approximately 122 percent means the image appears higher than the projector’s lens, allowing for convenient table placement directly below the viewing area.

Automatic setup features simplify installation and adjustment. Auto Screen Adjustment analyzes the projected image to correct geometry, focus, and alignment without manual input. Users can fine-tune the results using options for keystone correction, screen scaling, and shifting. Wall Color Adjustment compensates for surfaces that are not pure white, maintaining accurate color balance in nontraditional projection environments.

The PU615U uses LG’s webOS platform, which contributes significantly to its ease of use. Since the menu is based on the system utilized in millions of LG TVs, it is well-organized and easy to navigate. It is easy to navigate between streaming apps and input sources.

The PU615U features dual integrated stereo speakers with Dolby Atmos virtualization. The unit’s audio performance is stronger than might be expected from a projector of this size. The projector includes several preset sound modes. I did most of my listening in the STANDARD audio mode.

The dual speakers produce a wide stereo field with clearly articulated dialogue and midrange frequencies. Dolby Atmos virtualization enhances spatial cues, giving the impression of height and width that extends beyond the physical dimensions of the projector. At higher volumes, the sound remains composed with minimal distortion, although bass output is limited.

While its compact size limits low-frequency extension, the built-in sound is clear and balanced for general use. Users seeking enhanced performance can connect an external sound system via HDMI Audio Return channel (ARC) or Bluetooth.

The projector’s internal cooling system operates quietly, maintaining a low noise profile during normal operation. We do not measure audible noise, but LG lists the PU615U’s fan noise as 28dB. When the projector was set to Normal and ECO Light level, I could barely hear the unit's fan from my sitting position during quiet scenes.