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Engine noise.....help!!!!!!

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Engine noise.....help!!!!!!

Postby lowlife on Fri Sep 02, 2005 9:42 am

I have installed (with the help of a friend at work) 1 10" sub and a Punch400 amp in my truck. Problem is, there is MAD engine noise at idle. What are the most common causes for this? I have been told to try a ground loop isolator to get the noise out but that didn't work. I am open to any ideas!!!

Here is what I know about the system setup:

10ga. power wire running from battery to amp. RCA cables to electronic crossover ("el cheapo" Radio Shack model!!), RCa cables from pre amp outs on CD player to amp.

Also, the truck already had CD player and speakers before this install that didn't whine. The amp only powers the sub and the only speaker that whines is the sub.

I know this is basic info but, hopefully, someone will be able to help. It's driving me crazy!!!!!!!!!



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Postby RighteousAudio on Fri Sep 02, 2005 12:30 pm

are there any other power accesories sharing the ground? Try a different ground source



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Postby redteg on Fri Sep 02, 2005 2:01 pm

As BlueMopar said, check your ground. Be sure that it is grounded to bare metal and that it is good and tight.



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Postby lowflyn on Mon Sep 05, 2005 8:47 pm

Is your power wire and rca's run on the same side of the vehicle to the amp? This is a common cause for this kind of sound. If the power wire and rca's are run near each other this will cause engine noise to get into the speakers and drive you crazy. I know in my car I have my rca's run on the passenger side and my power and remote wires run on the driver's side.



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Postby seimport.com on Tue Sep 06, 2005 8:54 am

It is true if your power and rca are on the same side that it can leak into the audio signal. EXPECIALLY if you got cheap rca wires. You buy cheap quailyt you get cheap quality. Also, see if your wires are being run near any factory wiring harness. That can cause it as well. Third, are you near your fuse box? Fuse box is the easiest place for noise to leak into your system. Last, what kind of alternator do you have? Are you putting too much strain on it? is the noise. If it is a whine, then that is what we call an "alternator" whine, putting too much stress on it. USUALLY they are caused by ground loops. But if you already tested that, check your alternator

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Postby lowlife on Tue Sep 06, 2005 9:16 am

Thanks for the tips. I think the power wire and the RCA's are run pretty close together. I will try moving the RCA's first. I have checked the ground to make sure it is a good ground but will check again. (I am devoting all day this coming Saturday to solving this problem!!) I don't want to drive 8 hours to Atlanta listening to the sub whine. I am not above pulling the RCA's out of the crossover for the trip to get xome relief!!

Anywhoo...thanks for the tips.



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Postby seimport.com on Wed Sep 07, 2005 8:53 am

I have just a few more tips for you. UPGRADE your 10ga to a fatter wire. I just relized that your saidyou had 10 gauge. This might help your noise, but will extremly help your performance. Use the same size wire for your ground. Dont have your ground longer then 2ft. a link to show you what you need
http://www.the12volt.com/info/recwirsz.asp

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Postby SympleTruth316 on Wed Sep 07, 2005 8:05 pm

yes, the rcas and power wire should be run on opposite sides of the vehicle.

if you have 10 gauge, replace it with 8 gauge at the minimum.

if you have cheap rcas, replace them with good rcas.

spin around 3 times and bark like a dog.

You can have the biggest baddest stereo from a competition company but your sound is only as good as your worst wiring component.

make sure your amp isnt screwed into metal.

make sure your rcas ends are taped so they arent touching each other or metal.



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Postby RighteousAudio on Thu Sep 08, 2005 11:08 am

make sure your amp isnt screwed into metal.


does that effect the ground?!?!?!

make sure your rcas ends are taped so they arent touching each other or metal.


you know, I never thought of that....

hey Keith, I have a couple different sets of RCAs... one is a set of "StreetWires" and my friend that I got them from said that they have a little bit of a "crossover" effect in them to filter out a little bit of high frequency... is this true?

the other set of RCAs came in kinda of a cheapy amp-wiring kit, but they are shielded, twisted, oxygen-free, copper-core, and has gold-plated hardware... do you think these are any good?!?!?!



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Postby lowflyn on Thu Sep 08, 2005 7:53 pm

I'd use the cheapy looking ones, being shielded and twisted is alot better than most normal ones.



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Postby SympleTruth316 on Thu Sep 08, 2005 10:30 pm

yeah shielded and twisted are good to have. But ive never heard of a crossover inside an rca.



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Postby AutoXSTi on Thu Sep 22, 2005 9:56 pm

redteg wrote:As BlueMopar said, check your ground. Be sure that it is grounded to bare metal and that it is good and tight.


make sure the metal is almost shiney when you sand it for good continuity.



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Postby rollin on hubs on Tue Sep 27, 2005 12:58 pm

You can have the biggest baddest stereo from a competition company but your sound is only as good as your worst wiring component.


Wow that is about as well stated as you can get.

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Postby RighteousAudio on Tue Sep 27, 2005 1:19 pm

I'd use the cheapy looking ones, being shielded and twisted is alot better than most normal ones.


well... the street wires aren't "normal ones" they run up there with monster cables... Keith told me over NOPI weekend that the "cheapy ones" would be good if they weren't a copper core.... I decided to use them temporarily for aux inputs, and use my street wires for my subwoofer connection



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Postby lowflyn on Tue Sep 27, 2005 9:47 pm

I've ran the same set of rca's in all my stereo's, including my competition system I had with 2 power fosgate HX2 12's and 2 bd 1100's pushing those. Never had a problem nor noticed a difference in sound quality.



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