That cut it down by half, but its still pretty bad.
Well, at least we can say pretty savely that the cable is the problem now.
I found that the case was contributing a small bit
Sounds like grounding. Is any of the metal of the case touching the floor or adjacent objects?
I've already tried wrapping the cable in aluminum foil, it didn't help much.
Ah no, aluminum foil won't really help... Iso-tape does a better job, might be worth a try (at least wrapping the connectors).
As for stores, I certainly don't know any in the US... Getting an insulated 9-piner might be somewhat of a problem, I don't even know if they exist (I assume you are talking of a connector similar to this, as there are loads of connectors with 9 pins).
I'm also not sure if the connector itself is the problem, usually badly insulated cables are much more troublesome (they quite literally become antennas). How far away is the connector from the heavy duty parts (HD, CPU, video card)? Just taking the old connector and solder in a well insulated cable possibly might solve the problem, but I can't give any guarantee (also, out of curiosity, what else is hanging on that connector? it's certainly not just the headphones). Analog cables inside a computer are somewhat of a contraption any way you turn it, given all the electromagnetic fields in there. I usually connect my phones to the phone outlet of the speakers, but depending on your setup that might not be a possibility.
Alternatively, you might think about USB headphones to connect to your USB front port. Those are digital, so cable interference isn't a problem.
Or you could put a DI-box in there (ok, now that was just a joke).
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