hey I was reading a previous post about a hissing and i think it may applie to me.

"hiss occurs in the upper frequency spectrum

this suggests that your excessive noise floor (hiss) is being caused by the source unit"

Im think its being caused by the head unit as I dont have any amps the speakers are just running straight off the head unit.

I have a JVC KDSX985 head unit running Kenwood KFCP603 components in the front. That is all i have so far and on rock songs i seem to get a hiss from the left hand side. From reading the post Im pretty sure it is the high frequencies it doesnt seem to come from the right but then again the tweeter is kind of pblocked by my leg and the steering wheel etc where is the left has a free path.

Do u htink that is my problem? what else could it be? How do I solve this problem? Im getting a sub soon so will that even it out ?

your gains may be adjusted too high.. very common

I dont have an amp so i guess it must be the head unit gains if any?? :S anyway to adjust that? or do i have to put up with it?

you may have your treble settings turned up too high. the music CD itself could be a poor recording with alot of hiss left in during mastering. also in my experience, most head units output hiss from 75% of their volume control travel upwards, so if you have it at that level or higher you will likely get hiss through the deck amp. those would be the main reasons i'd think

if it a left one and you listen to rock, could be the gitaurs distortion systems

could that is

try different CDs/recordings. if the hiss persists, it'll be from the HU, whereas only poor recordings, as t-bro mentioned, would provide hiss.

if it's the HU, nothing much can be done. but upgrading with an outboard amp will bypass the internal (low quality) amps, and should fix the prob.