ok, need some ideas here guys. worked on a zephyr several months ago and put in an amp on subs and seperate amp on the factory speakers off of the factory indash stereo. the problem i am having is that the vehicle was getting a weird "hiss" out of all the speakers (front/rear mids AND front tweeters -- all factory speakers). this hiss is only noticed if the volume on the radio is completely off and then it was very faint. i re-adjusted the 4 channel amp and managed to get the hiss out of the mid-range speakers but couldn't get the tweeters to stop hissing. i realize that the tweeter is more prone to hiss because of the frequency tweeters are designed for but just for giggles i attempted to put bass blocker (caps) inline to eliminate the problem to no avail. i also tried tuning the inline converters down and that didn't help. i also tested for a bad inline converter and/or bad patch cords and all are fine. at this point i broke down in tears and ran around the shop naked until i was sent home sick -- lol j/k. i also tried manually grounded the radio to see if there was noise getting in thru a ground loop and no such luck. also tried using a ground loop isolator and that didn't help any either. btw, this hiss isn't like engine noise where it moves up and down with engine reving and isn't static. i really hope someone else has an idea because i'm fresh out. thanks in advance for the help and i await a response.
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"I cannot teach anybody anything, I can only make them think."
-Socrates-
i'm willing to bet you're hearing the noise floor.
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Prove your connections, use a meter!
I promise, I'll behave!
ok, that makes sense now... any suggestions to suppress it or fix it? thanks for the reply.
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"I cannot teach anybody anything, I can only make them think."
-Socrates-
Best only way to fix it is get rid of the OEM head unit as this is the source of the problem and you are not likely to get the hiss completely removed no matter what you do. Adding an aftermarket amp to factory head (and also retaining the factory speakers) is a recipe for nothing but trouble, including soon to be blown factory speakers. Convince your customer to go all the way and upgrade the entire system.
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Support the12volt.comhmmm interesting. i generally haven't had many systems have noise such as this in them after adding an aftermarket amp to the highs and mids but then again the tweeters are the only thing making the noise. really wish i would talk him into getting a new head unit but with the vehicle being brand new and he is my store manager i kinda doubt that will happen lol. thanks for the advice.
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"I cannot teach anybody anything, I can only make them think."
-Socrates-
Just put a Sony unit in my 2001 Lincoln LS using the Metra kit. Very clean looking install - meshes real nice with the factory dash plastics.