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Thread: Infill T3 static noise (Fixed, Problem solved)

  1. #11
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    Speaker wire is high voltage, power line is low voltage.

    There shouldn't be any interference.
    Jan Bennett
    FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

    Please post on the forums! Chances are, someone else has or will have the same questions as you!

  2. #12
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    I guess that brings me back to why am I getting a "buzz" whenever the T3 is on and the car is running. and the buzz frequency tracks the engine RPMs (higher RPMs, higher the frequency pitch). I only hear it when the engine is running and nothing is playing on the unit.

    I have everything hard-grounded to the vehicle chasis.

    Scot

  3. #13
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    Power line and RCA noise filters

    Quote Originally Posted by ScotLarsen View Post
    Did you ever figure this out? I am having the same problem. I am guessing I need to shield the speaker wires in case they are picking up interference for the power lines.

    Scot
    I'm still working on it. I've purchased American International's Xterminator power line noise filter. But I haven't put it on because bigjoe22 had a problem of burning something in the unit with a noise filter, so I got scared and waiting for his feedback. Also, I don't know exactly what type of noise filter he's using and if it has eliminated the static.

    Anyways, I contacted Infill and they said that in Korea, depending on the type of static, they use power line filter, and/or RCA noise filters (ground loop isolator) for the buzz. So this problem is not just me or you, but quite wide spread. So I don't know why some people has this static and some don't. Maybe it just has to do with the car or maybe some units are just born with it.

    But I know for sure the static is either from the supplied power plug or the T3 unit itself, because recently I took T3 out and put my factory radio back in and it sounds perfect without static.

    So I'm doing research on ground loop isolators/ RCA noise filters. Maybe using both power line filters and RCA noise filters will do the trick.
    Infill T3 with Infill Station
    2007 Hyundai Sonata

  4. #14
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    Thanks for the feedback IR...

    I was considering moving all my external grounds (video camera ground, etc) behind the infill noise filter. My guess is it's a ground loop of some sort. I was also thinking I should cap all the exposed rca connectors.

    Would nice to hear from someone who maybe solved this issue?

    Thanks, Scot

  5. #15
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    PS - have you checked this thread:

    http://www.mp3car.com/vbulletin/faq-...-speakers.html

    The article referenced in the last post is especially helpful.

    Forget my previous idea, I am going to start with disconnecting my wiring harness ground and connect directly to the chassis along with the rest of my grounds.

    Scot

  6. #16
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    Ground loop isolator RCA connection

    Quote Originally Posted by ScotLarsen View Post
    PS - have you checked this thread:

    http://www.mp3car.com/vbulletin/faq-...-speakers.html

    The article referenced in the last post is especially helpful.

    Forget my previous idea, I am going to start with disconnecting my wiring harness ground and connect directly to the chassis along with the rest of my grounds.

    Scot
    Thanks for the links. I've tried grounding both units of T3 directly to the chassis. But buzz was still there. But if the static is a ground loop problem, shouldn't I have the same static with my factory radio too? So that's why I think the problem is with the designated power supply adaptor or the unit itself. So theoretically, filter between the unit and the power supply adapter or a filter between the unit and the speaker should eliminate the static.

    I'm thinking of getting the RCA/ground loop isolator but all models I've seen on the net have RCA connectors. Since T3 has wires that connect directly to wiring harness, I don't know how to connect RCA connectors to the wires of the wiring harness. Does each RCA connector have a positive and negative wires? Then I can cut out the end connectors, strip and attach them directly to the wiring harness wires. Anybody know if this is correct?
    Infill T3 with Infill Station
    2007 Hyundai Sonata

  7. #17
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    If I had to guess, I would say the outer RCA ring is the ground (or shield), and the inner pin is the positive lead. This format is pretty typical.

    Have you checked to see if your RCA wires are running near your power leads? With the infill and the RCA connections between the top and bottom unit, it seems very difficult to not have the power lines and the RCA leads right next to each other. Some of the links I posted talk about this as a potential problem.

    Scot

  8. #18
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    Talking The static is gone!!!!!!!!!!!!!!!!!!!!!

    The static is finally GONE!!!!!!!!!!!!!!!

    Yes, the static is finally completely gone! Oh, I can't describe how happy I am!!!! And all it took was a ground loop isolator from a Radio Shack. No need for cutting and stripping the RCA cables either! The way T3 is setup, the sound is sent from the bottom computer unit to the top monitor unit via RCA cables; front left, FR, RR, RL. So I bought two ground loop isolators as each has a connector for two cables. I simply attached the RCA ground loop isolators between the bottom unit and the top unit. And yaba daba dooooo!!!! Absolutely, no static, no buzz, no hum, complete silence from the speakers. Oh yeah, and absolutely no reduction in the sound quality or volume level.
    Infill T3 with Infill Station
    2007 Hyundai Sonata

  9. #19
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    Congratulations!

    And I am glad to hear I was thinking along the right path. I was going to shield the RCA cables, but I will get the same GLI from Radio Shack.

    Thanks, Scot

  10. #20
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    Quote Originally Posted by ScotLarsen View Post
    Congratulations!

    And I am glad to hear I was thinking along the right path. I was going to shield the RCA cables, but I will get the same GLI from Radio Shack.

    Thanks, Scot
    Oh, you also need to get a phono plug adaptor too, because filter is male on both sides, one side needs to be female.
    Infill T3 with Infill Station
    2007 Hyundai Sonata

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