Thursday, November 1, 2018

LG C8 vs E8 (OLED65C8PUA vs OLED65E8PUA; OLED55C8PUA vs OLED55E8PUA)

LG C8 vs E8: The differences between the LG C8 and E8 are limited to sound, design, and screen sizes they are available in (the C8 comes in three screen sizes, including a 77-inch class model whereas the E8 can be only be found in the 65-inch and 55-inch size class). in other words, the picture quality, processing power, and Smart TV functionality are identical on the C8 vs E8. Sound
LG C8 LG E8
Speakers 2 Full Range Drivers 2 Sub-woofers 2 Tweeters 2 Mid Range drivers 2 Sub-woofers
Direction Down-firing Front-firing
Number of channels 2.2 Channel 4.2 Channel
Total Audio Power Output 40 Watts 60 Watts
The C8's speakers are down-firing whereas the E8 has front-firing speakers. This leads to voices and dialogues being projected more clearly by the E8 in comparison to the C8. However, it should be said that due to the alpine stand which has a cutout below the speakers, the C8 is able to direct the sound coming from the down-firing speakers towards you, at least to some degree (provided the TV is placed on a table top surface rather than being wall mounted). Nevertheless, this does not equate the audio quality on the C8 to E8, not least because the E8 has 4.2 channel speakers (and a total of 60 Watts audio power output) whereas the speaker configuration is 2.2 channel on the C8, and the audio power output is 40 Watts. This means that the C8 has two full-range drivers instead of two dedicated tweeters and two mid-range drivers that can be found on the E8. Both series, however, have two sub-woofers, and given that the C8 and E8 allocate 20 Watts to them, it's not surprising that the bass response is on par between the C8 and E8. There is some difference in the mid-range and high-frequency tones, however. Design
LG C8 LG E8
Design Cinema Screen Picture-on-Glass
Thickness 1.8 inches 2 inches
Clearance beneath the display 2 inches 0.4 inches
The E8 has the Picture-on-Glass design whereas the C8 does not. By omitting the glass back panel, the C8 is approximately 0.2 inches thinner than the E8. Nevertheless, the bottom half of the E8's panel (where the inputs and electronics are located) measures only about 2 inches vs 1.8 inches on the C8, so both TVs are very thin. When the E8 is mounted on a table top surface, the glass extends almost to surface the TV is placed on, leaving a clearance of only 0.4 inches. In comparison, the C8's alpine stand provides 2 inches of clearance beneath the TV. The C8's table top stand is wider than the one included with the E8 which necessitates a wider table or cabinet for the C8 to be placed on. In terms of wall mounting, both the C8 and E8 support the VESA 300x200 standard (except for the 77-inch C8 model which is compatible with VESA 400x200 brackets).
Pricing/Availability LG C8 LG E8
77-inch class OLED77C8PUA -
65-inch class OLED65C8PUA OLED65E8PUA
55-inch class OLED55C8PUA OLED55E8PUA
Check availability and pricing on Amazon.com for the C8 in the 77-inch OLED77C8PUA, 65-inch OLED65C8PUA, and 55-inch OLED55C8PUA class, as well as the E8 in the 65-inch OLED65E8PUA and 55-inch OLED55E8PUA class (affiliate links). LG C8/E8 vs E7 If the C8 and E8 are compared to E7, however, there are more substantial differences (such as the image processor and peak brightness capability) that directly affect the picture quality.
LG C8/E8 LG E7
Processor Alpha 9 M16P
Image Noise Removal 4-step 2-step
Sharpness Enhancer Yes (Object-based) Yes
Thanks to the increased processing power on the C8/E8's Alpha 9 chip vs E7's M16P SoC (up to 35% for both the CPU and GPU, according to LG), the C8/E8 are able to perform a quad-step image noise reduction that involves comparing different frames in order for temporal image noise to be identified and removed. Furthermore, a decountouring filter is applied twice on the E8/C8 for the purpose of achieving smooth gradation with low bitrate content. The E7 lacks the quad-step noise reduction process, meaning it's more prone to exhibiting posterization artifacts due to quantization errors in the source content. The C8/E8 also have a slight advantage over the E7 in terms of depth and sharpness enhancements. For example, the C8/E8 separately analyze textures and edges, and then process them accordingly so that edges are sharper whereas textures remain clear.
C8/E8 E7
Black Frame Insertion Yes No
HEVC decoder Main10 Profile @ level 5.2 Main10 Profile @ level 5.1
HFR content 4K @ 120fps (maximum bitrate 60Mbps); only via USB No
The C8/E8 have the ability to insert black frames during fast motion content for the purpose of clearing the visual persistence so that individual frames don't appear blurred together. The E7 lacks this option so it's more prone to the type of motion blur caused by the sample-and-hold principle used by the three OLED TVs for rendering and displaying frames. That being said, all three OLED TVs have the same native refresh rate of 120Hz, and nearly instantaneous pixel response time, so they don't exhibit any dark trails following fast moving objects. Furthermore, the C8/E8 and E7 can generate intermediate frames to be inserted between the original ones, so they have the same frame interpolation capability. There is a difference in terms of HFR (High Frame Rate) content support, though. Due to the inclusion of a HEVC decoder conforming to the Main10 Profile at level 5.2, the C8 and E8 are able to decode HEVC files up to 3840×2160 at 120fps (maximum bitrate 60Mbps), albeit only via USB because their HDMI 2.0 inputs don't have sufficient bandwidth to carry such signal. The E7's HEVC decoder, on the other hand, conforms to the Main10 Profile at level 5.1, so it's limited to decoding HEVC files up to 3840×2160 at 60fps.
C8/E8 E7
3D LUT Size 33x33x33 17x17x17
True Color Accuracy Pro Standard
Auto calibration via CalMAN Yes; CalMAN software is sold separately No
The C8/E8 utilize a 33x33x33 3D Cube LUTs (look-up tables), meaning that they have 35,937 reference color data points for color corrections as well as color interpolation of all the 1.07 billion colors their 10-bit panel is capable of that don't have a directly corresponding entry in the 3D LUT. The E7 also has a 10-bit panel, so the total number of colors is the same as the E8/C8 but the reference color data points are fewer: the 17x17x17 3D LUT can store only 4,913 data points to be looked-up when calculating the rest of the 1.07 billion colors. In other words, the C8/E8 have to perform less calculations than the E7, or less color interpolation. As a result, the C8/E8 can achieve more accurate colors than the E7, especially after calibration. Unlike the E7, the C8/E8 are able to provide the CalMAN software by SpectraCal (sold separately) with a direct access to their internal 3D LUTs so that they can be auto calibrated. But to do that, you'll need a colorimeter and pattern generator (also sold separately). Additionally, the CalMAN software has an access to a 1D LUT on the C8/E8 which contains 1024 reference data points, and it can be used for calibrating grayscale and gamma.
C8/E8 E7
Ultra Luminance Pro Standard
The C8/E8 have the Ultra Luminance Pro technology whereas the E7 has the standard Ultra Luminance. As a result, there is a slightly more brightness headroom on the C8/E8 vs E7 in case you need to make the SDR content brighter (e.g. when you're watching TV under high ambient light conditions). When it comes to HDR content, there is no significant difference between the C8/E8 vs E7 in terms of shadow and mid-tones reproduction (due to the fact that the ST.2084 Perceptual Quantizer (PQ) EOTF uses absolute lumiance). Therefore, the extra brightness on the C8/E8 is not used for making the entire HDR image brighter but is instead only allocated for highlights. In other words, the slight advantage the C8/E8 have over the E7 in terms of peak brightness can only be observed in specular highlights with HDR content.
C8/E8 E7
Logo Luminance Adjustment Yes No
In terms of preventing image retention, the E8/C8 have one additional feature under OLED Panel setting in comparison to the E7. It's called Logo Luminance Adjustment, and might be useful if you watch mainly broadcast TV. The C8/E8 and E7 all have the Pixel Refresher option in case you're noticing more prominent image retention, for example. That being said, all three OLED TVs are configured to automatically run a shorter compensation cycle after accumulating a couple of hours of usage so that they can measure and correct any irregularities in the voltage supplied to different areas of the panel, thus removing any temporary image retention.

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