Hiss usually is caused from an improper ground or grounded signal wire feeding the speakers or the source in which is playing. It's not always the culprit, however in many instances it is. I would start checking grounds, and I would also if you have the scosche harness like i do, utilize the extra Black Terminal'd ground that is in it and ground to your chassis inside the area where you mount the deck. Start there and work your way to the speakers.
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