BAD engine intereference PLEASE HELP

**shades1315** · 03-31-2005, 10:51 PM

I have a farenheit dvd player hooked up to my alpine cda-9827 through and aux-input and also to my lcd tv screen. At first my dvd player was plugged into my cigarrette lighter until a local audiophile told me this is the noisiest place in the car, then i tried hooking it directly to the battery and grounding it the the car body with a self tapping screw. That helped a little bit, but not much so i just tried the last thing i could think of, i spliced the positive and negative wires inline with the positive and negative going into my head unit, this also helped minimally, i also have the power wires hooked up to a 20 amp heavy duty noise filter which helps some. The sound i get is an irritating high pitched whine that increases in frequency with the engine rpms, this sounds is not noticeable when my headlights are off but gets extremely bad when my lights are on making it impossible to watch movies at night, or when it's raining, or when it's cloudy, you get the picture. I even had my alternator tested but it was fine also. I am out of ideas here, any help or suggestions would be greatly appreciated. Thanks in advance!

**ekip** · 04-01-2005, 12:39 AM

You will need this Ground loop isolator

That will take the interference out from the rca lines. Check also your amps grounding.

**XPbimmer** · 04-01-2005, 02:09 AM

Well the most obvious cause of amp interference has to be when wiring the linesignal-cable close to or even along the amp´s power cable(s)..
In my, and most other carPCs the puter is in the back with the amps, so this fairly short cabling shouldn't be the problem.
My problem is also the humming or summing or what you may call it. Mine just isn't caused by audio-cabling but apparently by my lilliput monitor somehow.. When i unplug the connector from the monitor all humming dissapears. Very strange..
I will need to look at my groundings and hunt down the source for this..

Well, good luck getting rid of this most irritating sound..! - Kinda sounds like having supercharged the f*** out of the engine..

Mads
- Denmark

**shades1315** · 04-01-2005, 07:23 AM

i've tried a ground loop isolator and it makes the sound worse, also i don't have an amp but the dvd player's power wires and rca cables are on opposite sides of the car so that probably isn't the problem either, any other ideas?

**Matthew230** · 04-01-2005, 07:32 AM

Is the audio out on your DVD player a headphone jack ?

**shades1315** · 04-01-2005, 02:27 PM

no the output is rca i have the audio split and running to my head unit and tv with rca cables

**Matthew230** · 04-01-2005, 02:43 PM

Have you tried grounding the DVD audio to the Heaunit audio ?

**shades1315** · 04-02-2005, 12:12 AM

yes it is grounded with the head unit and also gets it's power from the same line as the headunit

**Peoples** · 04-02-2005, 12:18 AM

man, my friend's amp does that.....it kinda sounds cool but after a while its annoying as hell.....as he speeds up on the highway it sounds like a ghostbuster's power pack charging up