The HDMI standard does not define a cable length. It only defines an expected impedance. 4K (or 3G) should work fine over a good quality 3' cable. 25' will probably not meet the impedance specifications from the HDMI standard.
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The HDMI standard does not define a cable length. It only defines an expected impedance. 4K (or 3G) should work fine over a good quality 3' cable. 25' will probably not meet the impedance specifications from the HDMI standard.