Q: What is the maximum length for an HDMI cable before attenuation occurs? (via Quora)
A: In reality, any length of cable will introduce some attenuation.
I think you’re actually asking “how long can a cable be before attenuation becomes a problem?”
But even there, there’s no absolute answer. A cable in an electromagnetically quiet location can be longer than one in a “noisy” location; a well-shielded cable can be much longer than an unshielded cable; etc.
But in general: You want the cable as short as possible. The longer the cable run, the higher-quality the cable (especially its shielding) has to be.
Generic cables usually work fine for short runs of a few feet (a meter or so). Medium-priced cables can do OK up to a couple meters 6-7 feet, or maybe more if there a few active interference sources nearby.
But be prepared to spend some serious money on the heavily-shielded cables that truly long runs require!
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