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crossed wires, a short, exposed wiring.

Another possibility is shoddy wiring. My 2008 GTS came with a 10" subwoofer set-up with a shoddy factory install that had power and ground cables for the amplifier routed on the same side of the vehicle which can cause this hissing sound. I rewired it myself instead of waiting for a Mitsu dealer to do it for me, and the hiss went away.

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14y ago
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Q: What is causing Speaker hissing sound when you accelerate?
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