Wireless and HDR
A new feature of the TW9300W is the possibility to show HDR-images, which means that there are more details in the lighter parts of the image. The use of this feature will be discussed on another page in this review. Unfortunately the HDR-function does not work flawlessly with every source. We tested the projector in combination with an Nvidia Shield, Google Chromecast Ultra and Samsung UBD-K8500 Blu-ray player. While all three of these devices support HDR-signals, we only succeeded in sending HDR-signals to the projector with the Samsung UBD-K8500 Blu-ray player, and only using 24Hz mode. Epson stated that they are not aware of any problems, but on multiple internet forums users are experiencing comparable problems. While we were unable to verify this, it seems to be an issue with the HDMI chipset in the projector: supposedly it has a maximum bandwidth of 10 Gbps. This means that the projector can only process 4K24p HDR images when these are shown in 4:2:2 colour mode with 10 or 12 bit colour. There is not enough bandwidth for 4:4:4 colour mode. Depending on the source-device this means that the images are either shown in 4:2:2 format – which the TW9300W can handle – or are changed to 8-bit colour, which results in a loss of the wider colour space.
However, that is not the complete story. The TW9300W that we discuss comes with a separate HDMI-sender, which can wirelessly send signals to the built-in HDMI-receiver. This functionality is only present in the TW9300W, the regular TW9300 and the TW7300 do not offer this option. Transmitting the HDMI-signals is done using the WiHD standard, which means that the images are uncompressed and have very limited latency. The strange thing about the TW9300W is that some modes that are unavailable with a wired connection, are available when using a wireless connection. The table below shows which combinations of input source and resolution we managed to get working. The Nvidia Shield console offers the same options in both wired and wireless mode, but we see differences with the Chromecast Ultra and the Samsung Blu-ray player. We do not have an explanation for this.
|Signal type||Freq.||Nvidia Shield||Chromecast Ultra||UHD Blu-ray|
|Colour depth / space||(Hz)||HDMI||Wireless||HDMI||Wireless||HDMI||Wireless|
|8-bit RGB Rec.709||24||Yes||Yes||-||-||-||-|
|8-bit 4:4:4 Rec.709||24||Yes||Yes||-||-||-||Yes (HDR)|
|12-bit 4:2:2 Rec.709||24||Yes||Yes||-||-||-||-|
|12-bit 4:2:2 Rec.2020||24||Yes||Yes||-||-||Yes (HDR)||-|
|8-bit 4:2:0 Rec.709||50||-||-||-||Yes||-||-|
|8-bit 4:2:0 Rec.709||59.94||Yes||Yes||-||Yes||-||-|
The image quality when using the wireless connection is (to the eye) the same compared with the quality of a wired connection when viewing the same signal, but in comparison with Epson’s full hd-projectors that we tested previously it seems that the wireless 4K-connection of the TW9300W is not as robust. The sender has to be placed in front of the projector to have a good connection, and even then we experience some hiccups every now and then in the signal; for example when someone walked between the sender and the projector.