Since HDMI is pure digital, cable quality is something of a misnomer.
Digital is pretty much on/off, so it either works or does not. At the
shows there are cheap HDMI cables, sometimes as low as $6.00
They work
They don't always, of course. Our HDMI cables run from very cheap to
extremely cheap, and in one recent rewiring found that only the second of
the following two configurations worked:
(1) TV--cheap cable--HDMI switch--ubercheap cable -- video source
(2) TV--ubercheap cable--HDMI switch--cheap cable -- video source
I don't know what can cause partial failure in a cable for a purely digital
signal - maybe in the case above the switch is not quite hdmi compliant,
with a minimal voltage requirement above the hdmi spec, and the wire in the
cheap cable has slightly high resistance - but to avoid frustration it is
worthwhile to buy from a dealer like Monoprice or Blue jeans that uses
Belden cable or equivalent; the cost premium above eBay-generic is pretty
minimal.
For analog cables (like VGA) all bets are off. I use high-resolution
projectors a lot, and have encountered many long cheap cables that work OK
at 800x600 but are essentially useless at 1280x768.
David
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