HeatUnit faulty or wrong installation?
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Silver Member Username: PanamanianPanama cityPanama Post Number: 217 Registered: Aug-05 | I send my car to install a new amplifier to my Pioneer 6x9 4ohms 460w max (80w rms). So I got this pioneer amplifier: GM4300F which is: 40w RMS x 4 at 4 ohms or 100w RMS x 2 bridged(4 ohms stable bridged). After installed, when the unit is working it plays, but if the engine is started INMEDIATLY you could hear a very ...zZZZZZZZZZz like hissing noise, with the engine at idle, if I accelerate while having the car in neutral it will give this noisy sound much louder (and almost nothing of music). The guy blames the low end cheap headunit: Pioneer DEH-3770MP http://www.pioneer.cl/www/Pioneer/PioneerCatalogo.nsf/93D52902421BAD7384256FCD00 7490C0/$file/DEH_3770MP.jpg The HeadUnit has no subwoofer output, so they are connected to the only RCA jack it has (named REAR), he then installed an RCA jack "Y Type" to split it, but mixing both rear and subwoofer. He then tried the same with another PIONEER headunit (that had lot's of RCA= FRONT, REAR and SUBWOOFER). and it played hard, with no noisy sound while engine was started. Therefore he says I should get a new headunit, because the one i have is to play stock speakers, NOT with subwoofers or amps. Is he right? |
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Silver Member Username: Thumpinwith8s2 RE8s,PG Xenon 400.1, New Numbers ... Post Number: 794 Registered: Jun-07 | 1>Can't find any info about that unit, your link is just a picture 2>I would try someone else, obviously the guy doesnt know what he's talking about.IF the HU has ANY RCA jacks then it HAS to be able to be hooked up to an amp. You can't hook RCA's up to stock speakers, RCA's are made for amps. 3>However, you may have a bad HU, normally I would say the whine you're hearing is because of a bad ground on the HU, but since you said he tried another HU and it didn't whine...guess that rules that out. 4>and finally, are you running both a set of rear speakers AND a sub? Thats what it looks like you are saying. IF SO, return those rear speakers..and just run the sub off the RCA's...so called "rear fill" is not really necessary....IMO |
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New member Username: LkiivesPost Number: 10 Registered: Mar-07 | yeah what he said  |
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Bronze Member Username: LkiivesPost Number: 11 Registered: Mar-07 | lol |
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Silver Member Username: KklaggeSan Diego Post Number: 494 Registered: Dec-04 | Sounds like you HU has a burned RCA ground inside it (only reason I can think of that just by leaving everything else alone and switching HU would make it go away)... OR, the install guy is purposely doing something to try and sell you a better HU I agree with Wolfman...lose the rear speakers (unless you drive a boat and the subs are another 10 feet behind the rear speakers...LOL) Does the alt. whining sound happen on all the speakers or just front or rear? |
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