Pop sound switching when sources, mute and turn off android head unit

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N

Nagyn

Member
Joined 2023
#1
Hello dears,

I have an Android head unit with the following setup:


  • Speaker output socket: for the door speakers
  • 1 RCA output socket: connected to the amp using a splitter
  • Remote power wire
  • Kenwood amp
  • JBL subwoofer

The problem is when I’m switching between radio/Bluetooth or any other source like launching the car link or putting the device on mute I hear a strong pop sound from the subwoofer

Also, when I tried another head unit (the original head unit) the problem disappeared

I tried to measure the output wires and the RCA output using a multimeter in DC mode and I noticed that the reading changed when switching the source

Here are two videos for the measurement process
Speaker wires measure:
RCA measure:


Any recommendations to solve it
 
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#3
Thanks for your reply
You will not believe if I told you that 99% of the unknown after market android head units in my country had the same issue 😃

I’m trying to figure out how to solve it because I tried many android head unit with no luck
 
#4
If you can find a schematic for one that's popping, post it.

Is the popping ONLY when dealing with external sources? And quiet when switching between sources internal to the head unit (AM/FM/CD/USB flash drive plugged into the head unit)?

^^^ If so, the noise isn't the head unit. It's the external units.
 
#5
The popping sound appears when I’m entering or exiting between all sources like radio/usb/bluetooth/Apple CarPlay also mute the sound and turn the device off
All of the above causes the popping sound and gives the mentioned measures
 
#8
It would need to be a circuit diagram of the head unit's circuit board. Popping with external devices could be those devices but switching between various internal functions of the head unit itself would indicate that the problem is internal.

Does it pop with no source connected to the head unit and only using the internal sources?
 
#9
Yes it pop without connected source and I believe it’s internal as you mentioned

I’ll try to find the circuit diagram but I believe it will not be easy to find it

I can take photos of the motherboard if that would help
 
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#13
All cables are connected to this socket
IMG_3262.jpeg
 
#14
Not NEARLY good enough. I'd need to know the exact two pins where they go into the board and the circuit components that connect to those pins. It may not be worth the effort to get that information.

Why are so many people buying head units with this problem if it's a known problem? Why not find a head unit that works properly, instead?
 
#15
No I can get this information for you
Is there any external solution to stabilize the output?

The answer for your question is that the market itself who push you to purchase such devices, the known devices is too expensive and you can’t imagine how much expensive it is

Also this problem appears when you use an amplifier
You won’t notice it when you are wiring the car speakers only
 
#19
I mean that the pop sound is existing on all the head unit output and it’s not noticeable from the door speakers but with the amp and subwoofer it’s very loud

So if you took any of the head unit output to the amp the problem will appear
 
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