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I recently installed the Infinity Kappa 60.5cs in my door along with a Pioneer DEH7600 HU. I didn't install an amp so I used the passive crossovers that came with the speakers. It sounds really good, EXCEPT for a slight hiss that I can hear in quieter parts of songs. The hiss doesn't seem to increase when the car is on or when I accelerate, so I don't think it's the alternator. I've heard of replacing the grounding wire to eliminate this problem. Does this mean replacing the grounding (negative) wire to my passovers or the grounding wire that is bolted to the chasis? If it is the wire connected to the chasis, is the black one you can see right when you pop off the storage and lighter plug housing? How much wire would I have replace? Could I just cut off as much as I can and splice on a thicker gauge wire and ground it with that or will I have to replace the entire grounding wire to the chasis? Thanks a ton for whoever tackles my questions.

 
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gotta reduce the amount of power going to the tweet to reduce the hiss, easiest way to cause hiss is coil rub, but reduction of power helps.

try setting the passive crossover to -6 dB if you have a crossover with attenuator jumpers, then compensate for the reduction in volume using the pioneer easy EQ, center the frequency at 3, 8, or 10k, id start at 8k with a 2W width (widest passband) and boost it a bit.

that should elimanate the hissing, unless you boost too much

 
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Thanks, I'll try that in the morning.

 
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Update:
My xovers have two settings: flat and contour. I have mine set on contour, which is supposed to decrease midrange output resulting in more perceived bass and high frequency. Since my xovers are inside my door, I'm not ready to take those off again. I messed w/the EQ on my Pioneer today and the hiss is pretty much gone. I've noticed some CDs have a hiss and others don't at all. I'm guessing the CD player is just picking up signals the old one didn't.

 
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i got a lot more hiss in my pioneer deck than others i've used. maybe the 2V output was to blame...

do you have the speakers amped? might want to adjust gain if you do.

presing and holding the eq button should get you into that menu WR was talking about.