Our take
The TH670 is a straightforward Full HD lamp projector to compare when native 1080p and optical zoom matter more than a built-in app platform. Check the room distance and lamp condition, and do not assume the model meets an ANSI brightness requirement that the reviewed manual does not establish.
A conventional home or multipurpose setup that needs native 1080p and moderate placement adjustment.
Avoid it if you need built-in streaming, native 4K, an ANSI output threshold verified by the checked sources, or a highly flexible lens-shift installation.
Pros & cons
What could work for you, and what to consider before buying.
What works in its favor
- BenQ's manual specifies native 1920 × 1080 resolution rather than only supported Full HD input.
- A 1.2× optical zoom gives some physical placement flexibility after the image distance is measured.
- The official material lists a 10 W built-in speaker for simple temporary viewing.
What to weigh up
- The reviewed official manual does not establish a comparable ANSI-lumen value.
- Lamp condition and remaining hours depend on the particular unit, especially for renewed or used offers.
- Streaming apps and precise throw ratio are not established by the saved model packet.
Specifications and exact model details
The key details
| Model covered | TH670 |
|---|---|
| Image format | 1920 × 1080 native |
| Rated light output | ANSI brightness not established |
| Placement | 1.2× optical zoom; verify throw distance |
Performance figures are manufacturer claims. Source checked October 17, 2026. Regional models and included accessories can differ.
Full review: how the features affect your choice
What the features mean for you
Native Full HD supports detailed home viewing
BenQ's TH670 manual specifies a 1920 × 1080 image. That makes it a genuine native Full HD option for movies, console menus and ordinary computer content, unlike models that only accept a 1080p signal while projecting a lower-resolution panel. The resolution alone does not tell you how large or bright the picture will be in your room, so keep image size, screen surface and ambient light in the decision. It also does not make the projector native 4K. If the main priority is a clear Full HD source at a conventional distance, the panel specification is a useful starting point rather than a complete selection test.
Use the optical zoom after measuring the room
The official manual lists a 1.2× optical zoom. This provides some adjustment to the image size without moving the projector, but the saved packet does not give a confirmed throw ratio for the specific candidate. Measure the lens-to-screen distance and verify the exact distance chart before purchasing a mount or planning a large image. Zoom cannot eliminate the need for the right physical location, and keystone adjustment, if used, is not a substitute for a square installation. For a living room with a fixed shelf or ceiling point, placement is a major practical question: compare it against the room rather than relying on a broad screen-size headline.
Keep brightness unknown unless the exact source supports it
The BenQ support page and manual used in this packet support resolution, lamp power and other setup facts, but they do not establish a comparable ANSI-lumen value for the TH670. Search snippets and unrelated model pages are not enough to fill that gap. If you must meet a numeric ANSI minimum, choose a model with an exact-model statement and keep this projector outside that filter until better evidence is found. Picture suitability also depends on screen size, room light and the condition of the lamp. For a used projector, original output claims do not tell you current performance; request a demonstration at the intended image size.
A lamp and speaker make a simple but not self-contained system
BenQ specifies a 210 W lamp and a built-in 10 W speaker, with the manual listing about 3 kg weight. The speaker may simplify a temporary setup, but it does not guarantee room-filling audio or a cinema-style sound experience. An external sound system can still be appropriate. Lamp life and condition vary by unit; ask for the counter, replacement details and clear startup demonstration before considering a used offer. The reviewed sources do not establish a battery, so plan for mains power. Keep ventilation and service access available, and check which remote, cable and input accessories are present in the particular package.
Plan streaming through a separate source
The saved TH670 facts establish HDMI and other physical connections, not a built-in streaming platform. A media player, console or laptop can supply the content, but verify the exact input formats and audio route for your equipment. If you expect protected subscription video, check that the device can output over the selected connection and that the receiver or soundbar handles the signal. This extra source is not a flaw when the room already has a receiver; it is a planning requirement for someone expecting a projector to operate by itself. Confirm the manual's port list and the seller's exact package before ordering accessories.
Compare it by room fit and documented tradeoffs
The TH670 is a useful comparison point for the native Full HD Epson Home Cinema 5040UB and Acer H6531BD. Epson documents a much wider powered zoom and 4K Enhancement, while its output ratings use ISO and IDMS rather than ANSI. Acer specifies 3500 ANSI lumens and a conventional 1.5–1.65:1 throw, but does not document an integrated app system. The TH670's saved evidence is narrower: Full HD, optical zoom, lamp and speaker. Choose based on what the room demands, and verify throw, lamp state and output evidence for the exact offer. These distinctions come from manuals, not hands-on comparisons.
Compare for your needs
Compare Epson Home Cinema 5040UB for powered lens adjustment and processing, or Acer H6531BD when an exact-model ANSI figure matters. Check each room distance and lamp condition.
Find the video projector that fits you.
Tell us what matters. We’ll help you weigh the options.
Before you buy
Is TH670 native 1080p?
Yes. BenQ's official manual specifies 1920 × 1080 resolution for TH670.
What does its 1.2× zoom do?
It gives some optical image-size adjustment, but you still need to measure the lens distance and check the model's full throw chart.
Does it have built-in streaming apps?
The checked BenQ sources establish physical inputs and a speaker, not an integrated streaming platform. Plan for an external source device.
Where can I check the current price?
Use the Amazon link for current offers. Check the exact model, seller, product condition, delivery, and return terms. This page does not display a live price or confirm stock.
Sources and review basis
Sources & review basis
We use the linked product documentation for the features above. Our suitability notes and buying advice are editorial judgments based on those features, not measured performance results.
- BenQ TH670 official support page and user manual ↗ — checked October 17, 2026.
- BenQ TH670 official support page ↗ — checked October 17, 2026.
- BenQ TH670/TH670s official user manual ↗ — checked October 17, 2026.
The decision
BenQ TH670 is a native Full HD lamp projector with some optical zoom and simple onboard audio. Its ANSI output, throw ratio and app support remain unestablished in the reviewed evidence.
Is it the right fit?
Check the exact model and today’s offers on Amazon.