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Troubleshooting help...

Discussion in 'Audio & Video' started by Bmw2Taco, Mar 14, 2021.

  1. Mar 14, 2021 at 6:31 PM
    #1
    Bmw2Taco

    Bmw2Taco [OP] Well-Known Member

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    18 dcsb TRD with JBL. I have a Rockford Fosgate 4 ch amp driving Kicker front components and rear speakers. I also have the PacAmp Pro AP4TY12 interface. OEM head unit. Everything has been fine for 2 years. Last week suddenly I lose sound from all speakers other than front left. At the same time the volume of front left is higher and a high frequency hiss is heard. Even when i turn off the head unit, the hiss is still heard. This issue is sporatic. It will happen and then go back to normal. I immediately suspected the AmPro module. Crutchfield sent me a replacement. I swapped it out but the issue persists. So...other than replacing the amp how can i troubleshoot this? Any ideas? How can I measure the output of the amp?
     
  2. Mar 14, 2021 at 6:34 PM
    #2
    destin_meeks

    destin_meeks I used to fix people's crappy stereos

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    A digital multi-meter from harbor freight for $10

    set it to AC volts
     
  3. Mar 14, 2021 at 6:51 PM
    #3
    Bmw2Taco

    Bmw2Taco [OP] Well-Known Member

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    A multimeter to measure the speaker terminal output? What AC Volt output value should I expect as normal? I guess I was thinking it was measured in Watts and not Volts.
     
  4. Mar 14, 2021 at 7:18 PM
    #4
    destin_meeks

    destin_meeks I used to fix people's crappy stereos

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    Seeing 10+ volts would tell you the amp is putting out plenty of power
     
  5. Mar 14, 2021 at 7:19 PM
    #5
    destin_meeks

    destin_meeks I used to fix people's crappy stereos

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    Factory radio stays clean till like 7volts I think
     
  6. Mar 14, 2021 at 7:23 PM
    #6
    Bmw2Taco

    Bmw2Taco [OP] Well-Known Member

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    Thanks Destin! Ill check this tomorrow and report back.
     
  7. Mar 17, 2021 at 3:16 PM
    #7
    Larzzzz

    Larzzzz Grande' Ricardo

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    Check this out.. enter the amp watts and speaker ohms and it'll give you the rest.

    https://testguy.net/content/266-Ohm-s-Law-Watt-s-Law-Cheat-Sheet
     
  8. Mar 17, 2021 at 3:27 PM
    #8
    Bmw2Taco

    Bmw2Taco [OP] Well-Known Member

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    So I picked up a cheap Kolbalt MM and I get 0.00v. I had a sine wave running from my phone at 1kHz. What am I doing wrong? The MM shows roughly 13 volts when I check the amp power terminals as expected. 0.00v when i check any of the speaker output terminals.20210317_182238.jpg
     
  9. Mar 17, 2021 at 3:28 PM
    #9
    destin_meeks

    destin_meeks I used to fix people's crappy stereos

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    Audio is AC volts. You’re set to DC
     
  10. Mar 17, 2021 at 3:30 PM
    #10
    destin_meeks

    destin_meeks I used to fix people's crappy stereos

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  11. Mar 17, 2021 at 3:31 PM
    #11
    destin_meeks

    destin_meeks I used to fix people's crappy stereos

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    You also want to disconnect your speakers when doing that, because pumping sine waves into them will blow them faster than anything else (and hurt your ears)
     
  12. Mar 17, 2021 at 3:59 PM
    #12
    Bmw2Taco

    Bmw2Taco [OP] Well-Known Member

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    Does this look right? Consistent across all 4 channels. 20210317_185557.jpg
     
  13. Mar 17, 2021 at 4:30 PM
    #13
    destin_meeks

    destin_meeks I used to fix people's crappy stereos

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    No, not if there “should” be audio playing.

    turn off the truck, go to the battery, and pull the amp fuse.

    count to 30, and put it back.

    try again
     
  14. Mar 17, 2021 at 4:52 PM
    #14
    Bmw2Taco

    Bmw2Taco [OP] Well-Known Member

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    Yes there was sound. No issue when I took the measurement. Ill pull the fuse and remeasure.
     
  15. Mar 17, 2021 at 6:07 PM
    #15
    Bmw2Taco

    Bmw2Taco [OP] Well-Known Member

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    Im about to lose my $h*t!! So the sound issue happened and I connected the MM. 0.0v on all channels. I disconnected power to amp, reconnected after 40 sec and the issue remains. 0.0v. Do you think it makes sense to replace the amp? If the issue still remains then it has to be the OEM HU.
     
  16. Mar 17, 2021 at 6:12 PM
    #16
    destin_meeks

    destin_meeks I used to fix people's crappy stereos

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    When you installed the amp, did you cut and splice them factory wiring? Or build a t-harness behind the factory radio
     
  17. Mar 17, 2021 at 6:26 PM
    #17
    Bmw2Taco

    Bmw2Taco [OP] Well-Known Member

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    No splicing with the PacAMP, plug and play. I did however splice into the factory speaker wires bundled behind the rear passenger seat. I think I'm going to "borrow" an amp from local big box retailer tomorrow to rule out the amp.
     
  18. Mar 17, 2021 at 6:34 PM
    #18
    destin_meeks

    destin_meeks I used to fix people's crappy stereos

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    I would just hook back up all the wiring back by the amp to factory and see. If you used the APH harness, your JBL amp should still be ready to go.
     
  19. Mar 17, 2021 at 6:38 PM
    #19
    Bmw2Taco

    Bmw2Taco [OP] Well-Known Member

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    That's a way to rule out the HU. I soldered all 8 speakers leads though...that would be PITA to revert back to factory just to rule out the HU. I believe I will replace the amp. 10 minute swap.
     
  20. Mar 17, 2021 at 6:43 PM
    #20
    destin_meeks

    destin_meeks I used to fix people's crappy stereos

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    Oh so you cut and spliced the JBL wiring? Bummer

    in that case, an amp swap will be the easiest thing to check
     

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