Engine noise, i dont no what to do now

[npcout 10+ year member]

First off, sorry for the double post, but i wanted to make my post more informative from the begining. Once again, i apologize.

I completed my installation of,

Car: 1998 Plymouth Breeze

Head Unit: Sony CDX-GT805DX (http://www.sonicelectronix.com/item_6927_Sony+CDX-GT805DX.html}

Speakers: Kickers 6.5's & 6X9

Sub Amp: Power Acoustik 1440 Max 720RMS

Speaker Amps: Pyramids (40RMS X 2 & 50RMS X 2)

Installation:

1 4-gauge power wire to distribution block. 8-gauge out to 1 speaker amp, 8-gauge out to other speaker amp. (There small amps, barely draw any power)

1 4-guage power wire to another distribution block. 8-gauge out to capacitor. (3 farad). 8-gauge out to sub amp.

Sub RCA's ran down power cable side (I had them in there from last install), speaker RCA's ran down opposite side.

I used a ground block to ground all my grounds to one location. I used a seat belt bolt under the back seat. Cleaned it off the best i could with sandpaper, steel wool and all.. Grounds got a little bit long because trying to get them all to one location.

PROBLEM:

After installed, i turned just my stero on, when it starts up, my speakers make a weird sound, only for a second tho, like they have power going to them.

Now, when i turn on the car, all i hear is a loud hiss type sound coming out of the speakers. When i press the gas, the sound gets louder. Keep in mind, this is extremely loud. I had to turn my speakers almost all the way up to not be able to hear it that well.

When i unplug my RCA's, it goes away. I dont think my sub picks up any bad noise, im not 100% possitive but im pretty sure it doesnt.

WHAT TO DO NOW:

Im going to ground my headunit somewhere else to its own ground spot

Reground amps, and make the ground wires as short as possible. May not be able to ground them all in the same spot though.

Try and pull HU out while playing to see if im getting radiating noise

ANY OTHER SUGGESTIONS, PLEASE HELP ITS FUSTERATING

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[krisfnbz 10+ year member]

You should always run your power cables on the opposite side of any speaker cable or RCA cables..make sure your grounds are good, and short...their is a sticky on how to ground your Hu a good way...my .02

 

[krisfnbz 10+ year member]

And... your head unit and speakers seem to be ok... but your amps... sub and speakers need some work. What sub are you running?? and pics would help much better

 

[xterra_on_22s 10+ year member]

it's your 6.5's just sell them to me and get a diiferent pair

lol

 

[npcout 10+ year member]

And... your head unit and speakers seem to be ok... but your amps... sub and speakers need some work. What sub are you running?? and pics would help much better

Im running a kicker L5 but there is nothing wrong with my sub. It sounds fine, its just my 4 speakers powered off my amp. My speakers omit a loud loud sound when the car is on.

 

[duckfart 10+ year member]

SOunds like either a bad ground or bad RCAs

 

[helotaxi 5,000+ posts]

You should always run your power cables on the opposite side of any speaker cable or RCA cables

Myth. No basis in reality. DC cannot and thus will not radiate noise into an AC signal. Also since the signal cables for the offending amps are run on the other side of the car anyway, this isn't even relevant.

Your problem you will find to be your HU ground or REALLY bad ground isolation on the speaker amps (quite possible with the Pyramids). Start by regrounding the HU behind the dash to bare metal.