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The "hum" is probably from a ground loop, caused by the two systems having multiple paths to a common ground. It could also be from a cheap speaker power supply that doesn't filter its power well.
The hiss is just inherent in all audio electronics; it will be worse with cheaper components. It's just low-level background noise.
Depending on the speakers, you might try a different power supply... or you might find a way of grounding the speakers. Make sure the computer is plugged into a properly grounded outlet as well.
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Originally Posted by Godzira
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Originally Posted by Brianrietta
Not a sebberry post goes by where I don't frown and think to myself "so..?"
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