If you go to an Audio Video website, they will sell you whatever you want.  When you buy through EMA, you have the advantage of tapping into the knowledge of our engineers who use the gear and know it’s limitations and idiosyncrasies. Today’s equipment is more complex than ever and security features continue to evolve.  For example: certain video components will plug into each other but may not communicate HDCP thus no video signal. There are many formats and protocols.  We design systems to talk to each other.