Cine4Home review: wireless HDMI kit
celexon WHD30M
No video signal, no projector picture! Most home cinema projectors still have no apps or WiFi connections of their own (with the exception of the LG Largo), so an external video signal has to be fed to them via HDMI for a picture to appear on the screen.
The cable needed for this is therefore a “necessary evil” and often presents users with further problems: the projector is usually ceiling-mounted and the cable has to span many metres across the room, which makes it hard to route discreetly. And as cable length grows, so do the risks with high-frequency signals (e.g. Full HD 3D), which show up as picture dropouts or “sparkles”. High-quality cables that are flexible yet reliable are correspondingly expensive.
Just as wireless networking (WiFi) has replaced wired networks in recent years, there are now wireless alternatives for HDMI transmission too, logically called “wireless HDMI”. Some manufacturers even integrate wireless transmission directly into their projector models (e.g. the Epson EH-TW9x00W series), but they charge a premium of several hundred euros for it.
External retrofit solutions have also been available for some time in various price classes, but most versions show weaknesses in picture quality, transmission stability and user-friendliness. For this reason, “wireless HDMI” has not caught on the way wireless LAN has.
Now the well-known screen and AV accessories manufacturer celexon is offering a new version that aims to set new standards in reliability and ease of use: the “Wireless HDMI Set 30M”, WHD30M for short, is available from ProjektorAG partners and Beamer-Discount for €199.
Previous wireless HDMI solutions have mostly failed to convince us; it was often details such as overly cumbersome activation or incompatibility with certain frame rates that disqualified the systems. Reason enough for us to take a closer look at the current system.
In the box are the transmitter and receiver units (including two handy stands) and the corresponding power supplies. Unfortunately, two short HDMI cables are not included and have to be bought separately.
The 5V power input via micro USB, which almost every standard smartphone also uses, is very practical. This gives you a free choice of power supply: as more and more devices (sources as well as projectors and TVs) have their own USB socket, in many cases no separate power adapter is needed at all. However, you should make absolutely sure that the output of the USB socket used is high enough (5W according to the manual).
Installation
Connecting the wireless kit for the first time is almost self-explanatory: the transmitter is connected via HDMI to the source (player, receiver etc.), and the receiver, also via HDMI, to the projector or TV. Unfortunately, the transmitter has no additional HDMI inputs and therefore cannot act as a switch box. If you want to connect several sources to the transmitter, you have to go via a receiver, for example – which most projector installations have anyway for sound.
In the picture above, you can see the transmitter connected to a PlayStation, whose USB port serves as the power source, so no external power supply is needed.
Opposite: the receiver and an example of the connection to a projector with a USB socket.
As the receiver (like the transmitter) is smaller than a packet of cigarettes and the stand can be removed, it can also be attached to the side of the projector with mounting tape.
Getting started
Once everything is cabled, you switch on the source (in this example the PlayStation) and the projector and wait: transmitter and receiver really do connect fully automatically, and without you having to do anything, the picture appears on the screen after a few seconds. Thanks to this “automatic mode”, the connection behaves almost exactly like a cable connection, the only difference being that it takes a few seconds longer to establish. We have yet to come across a simpler system.
Picture quality
Full HD transmission only lives up to its name if it is lossless. Many earlier wireless systems had shortcomings here because they reduced the resolution to save bandwidth.
To check whether the WHD30M set loses any picture information, we chose video signals that use Full HD down to the finest detail. Our results prove that the full resolution is transmitted for both luminance and colour. Full HD quality is therefore guaranteed.
Transmission stability
The most annoying thing that can happen with a wireless system is a dropped connection, however brief. Continuous picture transmission is therefore essential. In our test set-up, with around 5 m between transmitter and receiver, there was no problem in this respect – the connection was always stable. It did not matter whether transmitter and receiver were pointed directly at each other (although this is of course recommended where possible). Unfortunately, the system gives no information about the current transmission quality, either on the unit or on screen, which would make positioning and aligning noticeably easier.
It is also important that the transmission is not easily disrupted by obstacles, because in everyday use it is often impossible to prevent people walking through the signal path, for example. We therefore tested how well the 60MHz signal gets through in practice:
Thin obstacles such as wooden boards, fabric or glass pose no problem; we could not provoke a signal dropout here. Even “standing in the way” did not throw the transmission off; only when we deliberately blocked the transmitter did the picture finally freeze. The signal is held as a still image for several seconds before the connection drops. The WHD30M system does not reduce resolution to maintain transmission when the connection is poor – it only knows “all or nothing”. Given the stable connection, however, this approach cannot be faulted.
Conclusion
However sceptical we were before the test regarding user-friendliness and transmission stability, the result surprised us all the more. No wireless HD system has yet been so easy to install, so self-sufficient in operation and so stable in transmission. Using it really is as easy as using an HDMI cable – and “laying” it is probably even easier.
The compact dimensions and practical shape also make it easier to position or hide the units, and the 5V USB interface simplifies the power supply. Overall, the WHD30M system comes across as very well thought out and fit for everyday use.
We still see potential for improvement, though: several HDMI inputs switchable by remote control would be desirable, and an on-screen display with information on signal strength and the incoming signal would make it much easier to align transmitter and receiver optimally. But this is complaining at a high level – in this price class, the WHD30M system can be recommended without reservation.
+ Easy installation
+ Micro USB port for power supply (5V)
+ Compact units that are easy to stow away
+ Stable transmission up to Full HD
+ Self-sufficient and extremely simple operation (plug in and forget)
+ Not very sensitive to external influences
– Only one HDMI input / no switching
– No OSD
– No indication of current signal strength.
Matching product categories in our shop:
Further guides:
- Audio Return Channel – HDMI ARC for sound explained
- Projector HDMI connection – HDMI variants and compatibility
- Projector test: the best projectors of 2026 – the best models of 2026 by price class
