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Thread: ARGH! Engine noise!!

  1. #11
    What can I say? I like serial. Curiosity's Avatar
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    Have you tried bypassing the EQ? Process of elimination!

  2. #12
    Constant Bitrate JayKaye's Avatar
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    Ill give bypassing the EQ a shot, will let you all know how it went.

  3. #13
    Constant Bitrate
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    What happened with this?

  4. #14
    Jesus Freak antimatter's Avatar
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    I guess that was the problem. Ungrateful thread starter. Not enough decency to update his own thread with.

    shame shame
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  5. #15
    Constant Bitrate JayKaye's Avatar
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    oops! sorry guys. I only realised i left this thread open when I checked my 'suscribed threads'

    Turns out the problem was a combination of a few issues listed below:

    1) the PSU I made for the CarPC was too close to the RCA inputs for the EQ. Moving the PSU further back, along with rewiring the 4g wiring I have running behind the dash, reduced the engine noise to almost zero in the front speakers but the rear speakers were still giving me some grief.

    2) the rear speakers were running off cheap-o RCA's, I removed these and the fronts work perfect with little to no noise. I have still yet to replace the RCA cable with a decent low-noise one (like the one running my front speakers).

    Hope this helps


    oh, also. Just wanna add that I rewired my speaker (inc. RCA's) and power cables to seperate sides of the car with the spkr cables running on the side of the car that the ECU wasnt on. This helps too

  6. #16
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    rember one thing, EQ's (little known fact) are only made (its main goal) to cut levels not boost, turning its gain down and not boosting your 400khz and up freqs. will and probaly would have removed most of your noise before doing anything else. one important thing to do most techs in my idustry dont get or understand is case grounding all componets. that means running a wire from case screw of the reciver to case screw of your amps, computers, eq's etc

  7. #17
    Constant Bitrate gubon13's Avatar
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    Quote Originally Posted by 14.4vTech
    rember one thing, EQ's (little known fact) are only made (its main goal) to cut levels not boost, turning its gain down and not boosting your 400khz and up freqs. will and probaly would have removed most of your noise before doing anything else. one important thing to do most techs in my idustry dont get or understand is case grounding all componets. that means running a wire from case screw of the reciver to case screw of your amps, computers, eq's etc
    agreed - grounding is as important as the power input, but people just seem to cheese it a lot.

    btw, what industry are you in? only thing that came to mind when i thought of 14.4v was my cordless torque drill...
    "Is Wayne Brady gonna have to choke a b@$#*??!!"

  8. #18
    Constant Bitrate JayKaye's Avatar
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    Quote Originally Posted by 14.4vTech
    rember one thing, EQ's (little known fact) are only made (its main goal) to cut levels not boost, turning its gain down and not boosting your 400khz and up freqs. will and probaly would have removed most of your noise before doing anything else. one important thing to do most techs in my idustry dont get or understand is case grounding all componets. that means running a wire from case screw of the reciver to case screw of your amps, computers, eq's etc
    do you mean grounding all the equipment (eq, amps etc..) together and THEN grounding it to the car? or only grounding the equipment without grounding that to the car?

  9. #19
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    Quote Originally Posted by gubon13
    agreed - grounding is as important as the power input, but people just seem to cheese it a lot.

    btw, what industry are you in? only thing that came to mind when i thought of 14.4v was my cordless torque drill...
    LMAO ive been a Mechanic (auto) my Passion and main income comes from audio video installs in cars, also do some home theater but preffer cars, I am also a consultant for a company thats making mobile computers for cars.

    The last three years I wa working in a high end shop mainly working on late modle Bentleys, porche, BMW & BENZ

    Oh and your cars system is supposed to charge at 14.4 volts, unseen number for the most


    Quote Originally Posted by JayKaye
    do you mean grounding all the equipment (eq, amps etc..) together and THEN grounding it to the car? or only grounding the equipment without grounding that to the car?
    Ground all your componets the way they are supposed to be grounded, then run a wire from the head unit case to the next coments case and from that case to the next it creates more of a stable common ground, all your componets ground to their case.

    Good reading here for you all to lear about GROUND LOOPS
    http://www.epanorama.net/documents/g...oop/index.html

  10. #20
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    did u ever figure out that engine noise? My car was doing the same thing on the right side of the front end and come to find out it was a bearing in my tire that needed to be replaced?

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