BenQ TH671ST vs BenQ TK705STi
Bold marks the better figure where both are stated to the same standard. “—” means the manufacturer doesn't state it.
 BenQ TH671STMSRP $749 |  BenQ TK705STiMSRP $1,999 | |
|---|---|---|
| Display system | ||
| Imaging technology | DLP | DLP |
| Technology brand | DLP | — |
| Number of imaging devices | 1 | — |
| Chip / panel model | DC3 DMD | — |
| Chip / panel diagonal | 0.65 in | 0.47 in |
| Native aspect ratio | 16:9 | 16:9 |
| Native resolution | 1920 × 1080 | — |
| Addressable resolution | — | 3840 × 2160 |
| Colour wheel segments | 6 segment (RGBYCW) | — |
| Colour wheel speed | 2× | — |
| Optics | ||
| Throw ratio | 0.69–0.83:1 | 0.8:1 |
| Throw reference point | Lens | — |
| Projection distance table | 60″: 0.92–1.1 m · 70″: 1.07–1.29 m · 80″: 1.22–1.47 m · 90″: 1.38–1.65 m · 100″: 1.53–1.84 m · 110″: 1.68–2.02 m · 120″: 1.83–2.21 m · 140″: 2.14–2.57 m · 160″: 2.44–2.94 m · 180″: 2.75–3.31 m | 50″: 0.89 m · 60″: 1.06 m · 70″: 1.24 m · 80″: 1.42 m · 90″: 1.59 m · 100″: 1.77 m · 110″: 1.95 m · 120″: 2.13 m · 130″: 2.3 m · 140″: 2.48 m · 150″: 2.66 m · 160″: 2.83 m |
| Zoom type | Optical | Digital |
| Zoom ratio | 1.2× | 1× |
| Focus | Manual | Auto |
| Fixed offset | 103% | 100% |
| Focal length | 10.2–12.24 mm | 8.5 mm |
| F-number | 2.6–2.78 | 1.8 |
| Image size range | 60–120 in | 30–300 in |
| Vertical keystone | -40–40° | -30–30° |
| Horizontal keystone | — | -20–20° |
| Light source | ||
| Light source type | Lamp | LED |
| Light source detail | — | 4LED |
| Lamp wattage | 240 W | — |
| Light source life | Normal: 4,000 h · Smarteco: 10,000 h · Lampsave: 15,000 h · Eco: 10,000 h | Normal: 20,000 h · Eco: 30,000 h |
| Warm-up time | 30 s | — |
| Cool-down time | 90 s | — |
| Light-source dimming | — | Manual steps |
| Brightness | ||
| ANSI lumens | 3,000 lm | 3,000 lm |
| Contrast & black level | ||
| Dynamic contrast | 10,000:1 | 600,000:1 |
| Colour | ||
| Rec.709 gamut | 92% | 98% |
| Gamut metric | Coverage | Coverage |
| Gamma / EOTF presets | 2.2, 2.4, 2.6 | — |
| Bit depth / 'number of colours' | 30 bit | 30 bit |
| Calibration & picture control | ||
| Colour management system | 6-axis | — |
| Greyscale control points | — | 11 |
| Picture mode memories | 2 | — |
| HDR | ||
| HDR formats | — | HDR10, HDR10+, HLG |
| Motion & gaming | ||
| Frame interpolation (MEMC) | — | Yes |
| Max refresh rate | 1920×1080: 60 Hz | — |
| Input lag (rated) | 1920×1080 @ 60 Hz: 16.7 ms | 1920×1080 @ 60 Hz: 5 ms · 3840×2160 @ 60 Hz: 5 ms |
| Auto low-latency mode | — | Yes |
| Audio | ||
| Speaker power | 5 W | 16 W |
| Speaker count | 1 | 2 |
| Audio channels | Mono | — |
| Audio partner | Waves MaxxAudio | — |
| Audio outputs | 3.5 mm | 3.5 mm, HDMI eARC, Bluetooth |
| HDMI ARC | — | Yes |
| HDMI eARC | — | Yes |
| Bluetooth speaker mode | — | Yes |
| Bluetooth audio out | — | Yes |
| Inputs, control & connectivity | ||
| Max input signal | 1920 × 1200 | 3840 × 2160 |
| HDMI port count | 2 | 2 |
| HDMI ports (feature-level) | HDMI 1: HDMI 1.4a; HDMI 2: HDMI 1.4a, HDCP 1.4 | HDMI-1: HDMI 2.1, HDCP 2.2; HDMI-2: HDMI 2.1, HDCP 2.2 |
| Audio input terminals | 3.5 mm | — |
| Horizontal scan frequency | 15–102 kHz | 15–102 kHz |
| Vertical scan frequency | 23–120 Hz | 23–120 Hz |
| USB-C video (DP Alt Mode) | — | Yes |
| VGA input | Yes | — |
| USB media playback | No | Yes |
| RS-232 | Yes | — |
| 12 V trigger | — | Yes |
| Wi-Fi | — | Wi-Fi 6 |
| Bluetooth version | — | 5.2 |
| Firmware / software | ||
| Smart OS | — | Google TV |
| OS version | — | Android 11 |
| Netflix | — | Native |
| Casting | — | Chromecast built-in |
| 3D | ||
| 3D support | Yes | — |
| 3D sync method | DLP-Link | — |
| 3D formats | Top-bottom, Frame sequential, Frame packing, Side-by-side | — |
| Glasses included | 0 | — |
| Setup automation | ||
| Autofocus | None | When moved |
| Auto keystone | No | Yes |
| Screen fit / alignment | — | Yes |
| Obstacle avoidance | — | Yes |
| Eye-protection sensor | — | Yes |
| Acoustic noise | ||
| Fan noise (sound pressure) | Typical: 33 dB(A) · Eco: 29 dB(A) | Normal: 28 dB(A) · Eco: 24 dB(A) |
| Environment & power | ||
| Operating temperature | 0–40°C | 0–40°C |
| Operating humidity | 10–90%RH | 10–90%RH |
| Altitude / high-altitude mode | 3,000 m | 2,000 m |
| High-altitude mode | Yes | Yes |
| Operating orientations | Table, Rear, Ceiling | Table, Ceiling, Rear, Tilt-limited |
| Rated voltage | 100–240 V | 100–240 V |
| Rated frequency | 50–60 Hz | 50–60 Hz |
| Power consumption (max) | 355 W | 250 W |
| Power consumption by mode | Max: 355 W · Normal: 320 W · Eco: 240 W | — |
| Standby power | 0.5 W | 0.5 W |
| Networked standby power | — | 2 W |
| Power supply | — | External brick |
| USB-C PD output | — | 30 W |
| Physical & installation | ||
| Width | 296 mm | 229 mm |
| Depth | 224 mm | 250 mm |
| Height | 120 mm | 168 mm |
| Weight | 2.7 kg | 3.8 kg |
| Mount hole pattern | Thread: M4 · Screw length mm: 20–25 | Thread: M4 |
| Tripod socket | — | Yes |
| Safety & compliance | ||
| Safety & market certifications | CE | — |
| Support & ownership | ||
| Warranty | 🇺🇸 US 3 yr | 🇺🇸 US 3 yr |
| Light-source warranty | US: pre-installed lamp 2,000 hours or one year from purchase, whichever comes first (replacement lamp 90 days or 500 hours) | — |
| User manual | https://esupportdownload.benq.com/esupport/PROJECTOR/UserManual/TH671ST/TH671ST_UM_EN_230426092526.pdf | https://esupportdownload.benq.com/esupport/PROJECTOR%20FOR%20CONSUMER/UserManual/TK705STi/TK705STi_UM_EN_260316112414.pdf |
| In the box | ||
| Box contents | Remote, Power cord, Vga cable, Manual, Quick start guide, Lens cap | Projector, Remote, Power adapter, Power cord, User documents |
| Remote type | IR | Voice |
| 3D glasses in box | 0 | — |