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- TH685P vs 4K400x
BenQ TH685P vs Optoma 4K400x
What TH685P does better (1) and where 4K400x wins (4) — every spec side by side.
Dimensions
Size comparison
TH685P4K400x
| TH685P | 4K400x | Difference | |
|---|---|---|---|
| Height | 110 mm | 118 mm | −8 mm |
| Width | 312 mm | 315 mm | −3 mm |
| Depth | 225 mm | 270 mm | −45 mm |
| Weight | 2.8 kg | 3.5 kg | −0.7 kg |
Drawn to the same scale from the official dimensions (front and side).
Why is TH685P better than 4K400x?
- Weight2.8 kg vs 3.5 kg+25%
Why is 4K400x better than TH685P?
- Resolution (on screen)1920 × 1080 (Full HD) vs 3840 × 2160 (4K UHD)
- Built-in speakers (total output)5 W vs 10 W2×
- Fan noise35 dB vs 28 dB+25%
- HDMI inputs1 vs 22×
Specifications
Side by side
| Picture | ||
| Resolution (on screen) | 1920 × 1080 (Full HD) | 3840 × 2160 (4K UHD) |
| Native panel resolution | 1920 × 1080 (Full HD) | 1920 × 1080 (Full HD) |
| 4K method | — | 4K by pixel shifting |
| Display technology | DLP | DLP |
| Light source | Lamp | — |
| Brightness (ANSI / ISO lumens) | — | 4,000 lm |
| Contrast ratio (dynamic / claimed) | — | 1,000,000:1 |
| HDR support | — | Yes |
| Motion interpolation (MEMC) | — | Yes |
| 3D playback | — | Yes |
| Gaming | ||
| Maximum refresh rate | 120 Hz | 120 Hz |
| Game / low-latency mode | — | Yes |
| Lens & placement | ||
| Throw ratio | 1.13:1 | 1.5:1 |
| Throw ratio (zoomed in) | 1.46:1 | 1.66:1 |
| Throw type | Standard throw (1.0:1 and longer) | Standard throw (1.0:1 and longer) |
| Distance for a 100″ 16:9 image | 2.5 m | 3.32 m |
| Smallest image size | 30″ | 33″ |
| Largest image size | 300″ | 300″ |
| Lens shift | — | None |
| Keystone correction | — | Yes |
| Automatic keystone correction | — | No |
| Sound | ||
| Built-in speakers (total output) | 5 W | 10 W |
| Connectivity | ||
| HDMI inputs | 1 | 2 |
| HDMI version | — | 2 |
| USB-C video input | Yes | — |
| USB port | Yes | Yes |
| Ethernet (LAN) | No | No |
| VGA input | Yes | No |
| Audio output | Yes | Yes |
| Battery, power & lifetime | ||
| Power consumption | — | 305 W |
| Light source life | 4,000 h | 4,000 h |
| Light source life (eco mode) | 10,000 h | 15,000 h |
| Design & noise | ||
| Fan noise | 35 dB | 28 dB |
| Fan noise (eco mode) | 29 dB | 26 dB |
| Weight | 2.8 kg | 3.5 kg |
| Width | 312 mm | 315 mm |
| Height | 110 mm | 118 mm |
| Depth | 225 mm | 270 mm |
| Colours | White | White |
