No real surprises here, the HT2550 is pretty well endowed for a lower cost projector. True, like most home projectors today, there are no more “legacy” composite video or S-Video connectors. What there is, from left to right:
A pair of stereo audio jacks – one in, one out. A PC VGA input (standard DB15 connector) comes next. It can handle analog computer, or component video.
A pair of HDMIs is next. They are different! The left one is HDMI 1, and is HDMI 2.0 with HDCP 2.2 – which meets the requirements of Blu-ray UHD and other copy protected content.
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The second one is the good old HDMI 1.4 which has been around for a number of years. In theory, the first one should handle anything HDMI, but most manufacturers include an HDMI 1.4 – just in case there’s a problem, perhaps with a 10 year old player…
As always, I must complain - a third HDMI input would be very helpful for those not doing switching through an AV receiver. I tell all the manufacturers, but few have done so. Most recently a Vivitek had three. Other than high end commercial projectors, though. two is all you will normally find.
Next comes a USB Type B, for servicing, followed by an old school, RS-232 serial port, for command and control of the projector. Then comes the USB Type A port which is there to provide a 5V 1.5amp output. (It can be used for recharging most 3D glasses). Finally there's a 12 volt screen trigger. That's something not often found on lower cost home projectors, but, if you need it, great. It's used for raising and lowering a motorized screen which has a 12 volt trigger. More and more, these days, however, companies are moving to wireless control rather than 12 volt triggers.
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