I have a 3-year old iMac (pre-Retina display). can I connect my cable box via HDMI to a Firewire in order to use my iMac display as a substitute TV?

Is the USB-C Digital AV Multiport Adapter the right adapter to use for this Use Question above?

USB-C Digital AV Multiport Adapter

USB-C Digital AV Multiport Adapter

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