I think the product is not very well thought out. An HDMI output device is by default on a 16: 9 format designed. There are certainly 16: 9 TVs that do not have HDMI port for which the device would be to use then. However, I have a part for a 4: 3 TV bought. One can but unfortunately not on the device between 16: 9 and 4: 3 switch.
Short: My TV does not know about 16: 9 and my HDMI device nothing of 4: 3. Thus, this conversion should be integrated into the HDMI2A converter. But is not it. Therefore back.