“Large screen†is the mainstream trend of home-use large-screen display devices. Smart-projection is considered by many to be due to the advantages of both traditional projection (free switching) and smart TVs (rich content and strong expandability). The next breakthrough point for home display devices is that more and more consumers are willing to understand and purchase smart projection products and move the “bigscreen†home theater into their homes. However, “low resolution and high price†have become a common phenomenon in smart projection products. Throughout the current market, smart projection products generally have resolution below 1080P. Even with smart projection products with 1080P resolution, the price is close to 5000. Around Yuan, this deterred many users. 
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Recently, Cool LeTV launched the R4 Series Smart Projection, which not only has 1080P resolution, but also has a very high price/performance ratio. Today Xiaobian brings the real machine evaluation of this product to the vast number of consumers. How does it perform? Let's take a look at the evaluation report.
ã€Appearance Gallery】
Cool Music regards the R4S as an all-in-one design in the four corners, which is more agile than traditional models. The overall use of all-metal materials, sandblasting process, plus black color, so that the entire projector texture and technology sense. You can see "Full HD 1080P" full HD on the front.
R4S has a very user-friendly detailing design, such as a lens cover that can be slid laterally, which can effectively protect the projection lens from wear. The top cowhide material hand strap and equipped function keys are convenient for the user to control and carry. The back interface part also uses a flip design to prevent dust from entering.
It is worth mentioning that R4S is a professional-grade dual-channel split-band HIFI stereo customized by American AR. This separate speaker unit arrangement is conducive to the virtual surround sound effect of the speakers. The effects of listening to songs and watching movies will be very shocking. .
The lens is the core component of the smart projection product, and the R4S uses a 7-piece all-glass telecentric HD lens and an all-metal precision precision-milling lens barrel. The highly efficient double-lit lighting system not only greatly improves the performance and reliability of the entire machine. And the projected picture is clearer and sharper. The use of all-glass lenses and metal tube materials effectively reduces the phenomenon of thermal defocusing and running coke.
Interfaces, R4S is equipped with two USB ports, an HDMI2.0 interface, an AV interface, 3.5mm audio and coaxial digital audio output interface, to meet the user's daily viewing needs is basically no problem, below the interface is the projection of heat Outlet, you can see inside the copper heat conductive sheet, effectively protect the machine for a long time and stable operation.
[projection projection effect experience]
The projection ratio of R4S reached 1.2:1, which means that at a distance of 1 meter, the projected image width can reach 0.833 meters. We only need to place it at a height of 2.6 meters, and we can have a huge 100-inch projection screen. Whether it is watching a movie, watching a game or a family party, the big-screen viewing effects are even more impressive.
R4S uses RGGB four-channel light source design, compared with RGB three-color channel design brightness increased by 30%, with 8A high-current LED package and over-current drive technology processing, brightness corresponding to 6-channel design of 6-channel upgrade 70%. In the actual picture test process, R4S projection screen has high definition, strong sense of hierarchy, and excellent image color and detail restoration capabilities.
R4S uses Mstar dual 64-bit smart system, equipped with Mali3D GPU, even European 4K video decoding can also be smooth and smooth. By playing a 4K video test, we can see that the characters dance freely and smoothly, with no signs of stalling or smearing.
The R4S has 11 image optimizations, especially HDR high dynamic range technology. By playing the HDR test video, we can see that the overall screen brightness has been effectively improved, in addition to a variety of image systems optimized, the screen color saturation and texture is very strong, the screen color contrast is obvious, river, forest, mountain more three-dimensional, strong sense of hierarchy .
In addition, the advantages of R4S projection 1080P resolution is undoubtedly demonstrated. Even the fine lines on the wings of the dragonfly can be clearly displayed in front of the audience.
Actual machine projection screen effect display
ã€Projection data measured】
The intensity of light is the main factor affecting the projected projection screen. Many users complain that their projection equipment is blurred or unclear in the daytime or in the lighting environment, and the projection screen is ineffective. We tested the use of R4S in light-off and light-on environments for this type of pain point of use.
It can be seen that in the light-on environment, the R4S projection screen effect can still be kept clear, and Optimus Prime's character outlines and mechanical components can be clearly displayed and the colors are more realistic. The R4S performs satisfactorily in the lighting environment.
1, running coke, virtual focus test
The R4S is equipped with a 7-piece all-glass lens and a metal lens barrel. The machine performs well in terms of virtual focus and coke-out. Through actual testing, after one hour of machine operation, the projected image is still clear and the font shows sharpness. Obviously run out of focus and virtual focus.
2, brightness test
We adopt the industry's accepted brightness test method, ANSI's 9-point test method: divide the projection screen into nine equal parts, measure the brightness of each center, and then calculate the average of these 9 points. The average illuminance of R4S.
Our actual luminance test result is 633 ANSI lumens (exactly different from the 880 ANSI lumens given by the official). Since the test is affected by factors such as ambient light, it is for your reference.
3, contrast test
Contrast is an important criterion for considering the quality of a projected picture. Contrast, the ratio of white to black, is the gradient from white to black. (The higher the ratio, the more gradient levels from white to black, the richer the color performance). We also used the ANSI contrast test method to test the ANSI contrast of R4S.
Take the central illuminance of the 16-point black and white color patch, and then the ratio between the average value of the eight white areas and the average value of the eight black areas is the ANSI contrast. The R4S has an ANSI contrast of 72:1. (The ANSI contrast value is between 100-200, which means that there is an excellent picture display capability.) The test is affected by the environment. The value is for reference only.
4, noise test
In the noise test process, we chose to conduct this test in a closed and quiet environment. We placed the detector close to the projector's air outlet and tried to obtain a relatively strict set of data.
Through actual tests, the most noisy place is the projection cooling outlet location, which has reached 62.9 decibels, and the body around the basic 40-50 decibels (30dB ~ 40dB is the ideal quiet environment, more than 50dB will affect the rest and sleep) .
5, temperature test
Intelligent projection equipment has the characteristics of high integration, especially in the process of playing movies, there will be a lot of heat generated by the motherboard, chip, lens, if the projection device cooling effect is not good, long-running will appear to run coke, thermal defocus phenomenon .
We conducted temperature tests on the R4S lens, the heat vent, and the left and right sides, respectively. After testing, the outlet temperature is 33.7°C, the lens temperature is 39.9°C, and the temperature on both the left and right sides of the body is close to the indoor temperature, and the heat dissipation performance of the R4S is better.
6, power test
Finally, in terms of power consumption testing, the power of the projector in standby is 0.83w. The main interface of the system and power consumption when playing online video is about 60w. When playing local video, the power consumption slightly increases to about 63w.
ã€System and Function】
The R4S uses a cool OS system based on Android 6.0. The overall UI design style is simple and clear. The homepage is divided into four sections: video, music, office, and game. The user uses a clear view, and the right operation is a third-party application. After the actual test, equipped with 3GB ddr4 memory, the system operates smoothly.
In terms of function setting, R4S supports brightness mode adjustment, color temperature adjustment, automatic keystone correction, autofocus and front projection, rear projection, ceiling projection, and other projection methods to meet the needs of users in different scenarios.
Especially the auto focus and automatic keystone correction function, the machine runs automatically after power on, we in the actual experience process, auto focus speed is very fast, less than 10 seconds screen can be clear, eliminating the user to manually focus the cumbersome steps , to protect the user's experience. In addition, the autofocus function can monitor the projected picture in real time, fine-tune the picture before it fluctuates, and prevent the thermal defocus phenomenon from occurring.
The R4S supports the Airplay/DLNA/Miracast transmission protocol. It can achieve the projection screen function of Apple, Android, and computer systems. No matter where you are, what equipment and systems you use, you can cast your PC/mobile phone/PAD to cool. LeTV R4S.
We used the iPhone to perform the screencast test. The actual screen shot process was clear and smooth without delay.
R4S has built in iQIYI's content and video resources, covering more than 95% of the entire network of movies, TV dramas, variety shows, animation, sports, documentaries, short videos, etc., and supports full-web search. In particular, iQiyi has a built-in 3D cinema area where users can experience 3D video content resources at home. It is understood that R4S uses DLP-3D active shutter display technology, users can wear 3D glasses at home to immerse themselves in the world.
Written at the end:
Cool music as R4S as a smart projection device, all aspects of remarkable performance, projection resolution of 1080P, the actual use of the test down, the projection screen is clear, the screen color, detail restore excellent, even in the light of the environment, still Has a better projection screen performance, in addition also has many practical features such as auto focus and auto keystone correction, greatly improving the user experience, this cool music as the R4S price of 3799 yuan, compared to the market in the sale of 1080P Projection equipment, high cost performance, interested consumers can focus on.
Smart TV/box information can focus on smart TV information network sofa butler (http://), China's influential TV box and smart TV website, providing information, communication, TV boxes, smart TVs, smart TV software, etc. Answering questions.
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