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Help with factory head unit volume decreasing

Discussion in 'Audio & Video' started by Mike402, Apr 29, 2021.

  1. Apr 29, 2021 at 11:14 AM
    #1
    Mike402

    Mike402 [OP] Well-Known Member

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    Greetings, thought I would throw this out to the experts and see if this has come up before.

    I upgraded the Entune non JBL system in my 2020 Taco to the following:

    Kicker front & rears
    Subaru tweeters
    JL audio stealthbox
    Rockford Fosgate PM1000x5 amp

    I have the factory head unit, and used this adapter: https://www.amazon.com/dp/B087Z1794K?ref=ppx_pop_mob_b_asin_title

    Everything works and plays fine with one exception. Every now and again, the volume level goes down, and it only plays at mid level when I have it turned to max. If I shut everything off and restart the car, it will return to normal volume levels. This will happen sometimes in the middle of a song, all of a sudden, volume goes way down randomly.

    I checked to make sure the autolevel setting on the head unit is turned to off. I am playing songs via youtube from my phone, and have ensured that the phone volume is turned all the way up. All other settings seem to be ok. All the amp settings seem to be in order with the gains, crossover points, etc. Does it make a difference if the car is running or not, some sort of battery saver feature?

    Seems like the two likely culprits would either be the head unit adapter or something in the amp, but I don't know how to isolate those or diagnose, short of replacing them.

    Has anyone else experienced this, or any other ideas what it could be? Very frustrating!
     
  2. Apr 29, 2021 at 1:48 PM
    #2
    LC7

    LC7 Well-Known Member

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    I'm interested to hear the answer as well. It sounds like an issue with the amp-on trigger wire (usually blue?), like a bad connection that breaks when jiggled or something.
     
  3. Apr 29, 2021 at 1:50 PM
    #3
    Plain Jane Taco

    Plain Jane Taco Open the pod bay doors please, HAL

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    What do you have the auto volume set at?
     
  4. Apr 29, 2021 at 2:22 PM
    #4
    Mike402

    Mike402 [OP] Well-Known Member

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    Ok that sounds like something easy to check. I could try recrimping the connection to the adapter.

    So if that lost connection, the system would revert to head unit power?
     
  5. Apr 29, 2021 at 2:22 PM
    #5
    Mike402

    Mike402 [OP] Well-Known Member

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    I have the auto volume set to off. Should that be set to high?
     
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  6. Apr 29, 2021 at 2:27 PM
    #6
    Mike402

    Mike402 [OP] Well-Known Member

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    Also one thing I should point out, the adapter has a gain switch inside. I left it set at the factory setting, as I'm hesitant to mess with that and send a bad signal to the amp/speakers. But that wouldn't explain why it is changing from high to low.
     
  7. Apr 29, 2021 at 3:27 PM
    #7
    GRNT4R

    GRNT4R Well-Known Member

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    If your budget allows. Maybe look at an audio control LC2i or one of their other line level adaptor. You could return what you have ans get a cleaner signal from the Audio Control unit
     
  8. Apr 29, 2021 at 5:49 PM
    #8
    dolbytone

    dolbytone Well-Known Member

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    No, you’d just have no sound if your amp turn on wasn’t supplying 12VDC.

    I’m inclined to believe you have a voltage drop, or resistance on the ground, ie. check your power connections.
     
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  9. Apr 29, 2021 at 8:43 PM
    #9
    Mike402

    Mike402 [OP] Well-Known Member

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    Not familiar with that audio control. Do you know if you have to splice wires, or is it a plug and play? Only reason I'm hesitant to change this adapter out is because I also have the anytime camera setup, and everything plays nicely together.
     
  10. Apr 29, 2021 at 8:48 PM
    #10
    Mike402

    Mike402 [OP] Well-Known Member

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    So I went ahead and pulled my radio and cut the remote turn on lead and crimped them together again.

    I actually went two hours driving around and had no problems, and thought, holy shit that's it. But then I parked and it happened again.

    However I now think it has something to do with the bluetooth connection and/playing the songs from Youtube. Because I closed the youtube app and tried it again, and the volume came back to normal.

    So the next step is trying a different/more reliable source. Going to try the radio as well as a USB stick. If it does it with those, then I know it is still a hardware issue within my system.
     
  11. Apr 29, 2021 at 8:54 PM
    #11
    Mike402

    Mike402 [OP] Well-Known Member

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    Interesting. I grounded it with a bolt that was already in place and had two small ground wires going to already right under the driver's seat, towards the front. Do you think that might be causing a problem? Should it have its own ground location? I was trying to avoid drilling another hole in the bottom of my truck.
     
  12. Apr 30, 2021 at 5:23 AM
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    GRNT4R

    GRNT4R Well-Known Member

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  13. Apr 30, 2021 at 6:30 AM
    #13
    dolbytone

    dolbytone Well-Known Member

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    Or he could get a T-Harness because...

    D1B03E72-03BE-4CDE-853C-E9DC60DD6835.jpg
     
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  14. Apr 30, 2021 at 6:39 AM
    #14
    GRNT4R

    GRNT4R Well-Known Member

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    Bingo. There you go
     
  15. Apr 30, 2021 at 10:30 AM
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    Plain Jane Taco

    Plain Jane Taco Open the pod bay doors please, HAL

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    No I would leave it off. Definitely sounds like there's some kind of issue
     
  16. May 2, 2021 at 4:29 AM
    #16
    Knappster26

    Knappster26 New Member

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    I’ve been planning out my audio upgrade recently and have decided on going with the LC7i. Currently, when you turn up the volume on the head unit, it decreases the gain across different frequencies to protect the sh!tty speakers it came with, the audio controller will tune that out. Also, it provides the convenient way to get RCA cables to the amp, and multiple of them at that so you can have different sound zones/levels. To install this bad Larry, you need to cut the speaker input wires (leaving them as long as possible) and direct them to the audio controller. Then you have the RCA Cable to the Amp. Finally you wire the amp to your speakers. Unfortunately this is not as simple as the plug and play, but from my understanding, and I am not an electrical or sound engineer, this is the proper way to get the best signal to your amp using the factory head unit. Good Luck.
     
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  17. May 2, 2021 at 5:00 AM
    #17
    dolbytone

    dolbytone Well-Known Member

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    You never have to cut anything, there are adapters/connectors you should always be using instead of damaging the vehicle harness at all.

    About this fascination with Plug and Play a lot of you guys seem to have. It’s lazy. Stop making it a priority to not have to put in any effort, you’re consequently making the wrong compromises.
     
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  18. May 2, 2021 at 5:30 AM
    #18
    Knappster26

    Knappster26 New Member

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    Good to know. I have not done my install yet but assumed you would have to cut a few wires. Thanks for the input. I would agree that putting in a little extra work is worth the return.
     
  19. May 2, 2021 at 1:27 PM
    #19
    Mike402

    Mike402 [OP] Well-Known Member

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    Well you are paying for someone else's ability and time invested to solve a problem. Take the anytime backup camera harness for example. It would have taken waaay too much time and effort (for me anyways) to try and figure out how to get everything to work instead of buying the plug and play harness. Just have to figure out the value of your time and what you are willing to pay for.

    Now I agree that in the case with the add a amp harness, you are making compromises with using the thin factory speaker wire for an amplified signal, and any limitations with the head unit.
     
  20. May 2, 2021 at 7:06 PM
    #20
    dolbytone

    dolbytone Well-Known Member

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    You misunderstood what I was really referring to, I’m talking about Powerbass speakers, Subaru tweeters, OEM+ systems etc. I’m not talking about buying necessary harnesses and dash kits, speaker wiring adapters, OEM USB/GPS/AUX adapters etc.

    “Plug and Play PLUG AND PLAY!!” It’s wearing me the fuck out because there’s so much better to be had, and for some reason people are more than willing to give that up for mediocre easy to install equipment.
     

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