JVC DLA-NX7 4K D-ILA Projector Review
Brightness. The DLA-NX7 is rated for 1,900 lumens, with no specific measurement methodology cited in its spec sheet and manual. Our 9-point-averaged ANSI measurements on two different samples were relatively close to one another (despite more than 200 hours on one of the lamps), and showed a maximum of 1,628 lumens with the projector lens at its widest (brightest) zoom position, and a 4096x2160, DCI-4K resolution signal that utilized all available pixels on the imaging devices. This measurement was achieved in the HDR10 mode with the manual iris fully open, the lamp in High power mode, and the HDR color space selected (the Rec. 2020 color space engages a filter that reduced brightness by 15%). A single-point measurement of only the brightest sector in the image (the middle-top box of an imaginary tic-tac-toe grid) yielded 1,750 lumens.
With 1920x1080 or 3840x2160 test signals at the more commonly used 16:9 aspect ratio, the ANSI lumen measurements for all the modes is shown in the table below. All measurements were taken in the High lamp mode and wide zoom position; engaging the vertical lens shift fully in either direction had negligible effect on brightness. Switching to the Low power lamp setting (the default for all modes except the HDR-compliant modes) reduced brightness in any mode by approximately 29%.
JVC DLA-NX7 ANSI Lumens
|Frame Adapt HDR||1563||1107|
|User 1 (...User 6)||1,555||1,104|
Zoom Lens Light Loss. Moving the zoom position from full wide to full telephoto results in a 26.4% loss of brightness. This is in keeping with the wide 2.0x range of the zoom. Given such a range, many users will not require the full telephoto capabilities and will therefore come in with a smaller reduction in brightness.
Brightness Uniformity. The high quality lens on the DLA-NX7 produced an exceptionally sharp image from edge to edge and also showed superb brightness uniformity, measuring in at a high 87%.
Fan Noise. Fan noise on the DLA-NX7 is noticeably improved since the last generation JVC consumer projectors as respresented by my JVC DLA-X790 reference. Not only did it come in 2 to 3 dB quieter in any given lamp mode in casual measurements, but at its loudest, it delivered its noise at what seemed to be a lower, less distracting pitch. With the lamp on Low in Natural or any other mode, the projector was whisper quiet. With High lamp mode, which kicks in for HDR viewing, the fan's hush became more noticeable from my measuring position 5 feet in front of the projector, but would not likely be distracting in most rooms with a typical ambient noise floor. After activating High Altitude mode on the NX7, which is recommended for elevations of 3,000 feet (900 meters) or higher, the noise remained acceptably quiet when combined with Low lamp mode, and was even quieter than the X790's High lamp mode with High Altitude off. Combining the NX7's High lamp mode and High Altitude settings produced the greatest amount of noise, but was quieter than just about any projector I've heard with these settings. Depending on the distance between the projector and viewers, you may be able to avoid special efforts to acoustically isolate the projector.
Frame Interpolation. The DLA-NX7's Motion Control menu has settings for a Clear Motion Drive frame interpolation feature and a Motion Enhance feature that is said to reduce image blur, each with a Low and High setting; some modes also offer an Inverse Telecine setting to restore film-based 60 Hz content to a 24 Hz frame rate. Additionally, there is also a Low Latency mode that can be switched on or off, and which grays out the Clear Motion Drive settings when active. When it's active, the Clear Motion frame interpolation is available for both 4K and 1080p signals.
In its Low setting, Clear Motion Drive imparts only a slight video sheen to film-based content while still being very effective in reducing blur. Although I conducted most evaluations with CMD turned off, this setting was an acceptable choice for most content. The High setting, which is recommended for sports, imparts a high degree of video "soap opera effect" to film-based content, and provides marginally better blur reduction for very fast moving objects. I did not see any noticeable effect of the Motion Enhance feature.
Input Lag. With a 4K test signal, the DLA-NX7 measured between 50.0 and 54.8 milliseconds lag time with its Low Latency mode turned on in any picture mode. This is more lag than the 33.8 ms JVC says they've measured for this model; we'll be rechecking our numbers and will update the review with additional information as it becomes available. As it stands, the 50-55 ms range in our tests, or even a measurement of 33 ms, is acceptable lag time for casual gaming, but well above the 20 ms or below sought by serious gamers competing in online play. With Low Latency turned off, 4K input lag was between 109 ms and 112 ms. For reference, the JVC DLA-X790, from last year's line-up of 1080p e-shift projectors, measured between 32.9 and 38.5 ms in any mode with its Low Latency setting turned on.
JVC DLA-NX7 Connections
All input/output connections and the power cord attach on the DLA-NX7's back panel, where there is also a push-button control panel and additional IR sensor.
• (2) HDMI 2.0b/HDCP 2.2 inputs
• (1) 3D sync output (Mini Din 3-pin)
• (1) 12v DC/100ma trigger output (3.5 mm)
• (1) RS-232C control (D-sub 9-pin)
• (1) USB (service only) • (1) LAN control (RJ-45)
|Review Contents:||Introduction, Features||Color Modes, SDR Viewing||HDR Viewing, 3D Viewing, Conclusion||Measurements, Connections|
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