• HW Installation Support

  • Exploring the problem of popping sounds

dudu-lai So connecting the amp control wire and updating the MCU would not fix this problem? Setting the amp volume to 0 fixes the thumping noise but I cannot hear any sound as a result. Maybe a workaround for the engineer could be setting it 0 before the head unit shuts off then seeing it to the previous value when it starts up.

      Yesterday i updated the Firmware of the Mekede M6 with DUDU OS.
      When you put in the USB stick and the head unit then reboots to the firmware update, no pop.
      Directly after the update when it starts, no pop.
      If you then reboots the head unit, pop.
      But it seems that it happens in the shutdown phase not in the start phase.
      But this is just a though, i don't know how fast the rebot phases are.
      In tve car is no AMP. It is the head unit with OEM speakers.

        JhonnyD normal

          VishBK You can try to update the MCU. You need to connect the ACC line of the CANBUS box to the AMP CONT of the A connector.

              dudu-lai I have connected the Amp control cable to the AMP C harness cable on my subaru outback 2017 with OEM harman kardon amplifier. and also applied the MCU Updates from here. https://drive.google.com/drive/folders/1QHfKsoY7tsgg4Bls8ezOjKWCTBwZ5NNy?usp=sharing）
              The noise still happening during Dudu OS boot. do i need to also install the APK for jeep. or can you provide me with the one compatible with subaru? sharing here my dudu info. and a picture showing the connected amp cont cables

              Thanks for your support!

                  McDudu Prior to this, was the AMP control wire connected to the ACC cable or was it not connected to the

                      dudu-lai no it was not connected, i soldered the two after i received your feedback regarding this cable needed to be connected to the harness. The harness did not have (AMPC) this pin was empty. so i had to take this cable from another harness to be able to connect it to the amp control cable.
                      here is what the wiring harness looked like prior

                          McDudu If there is no connection, then it is not controlled by the AMP line. If I unplug the CANBUS box, will there be sound from the speaker?

                              dudu-lai My harness did not come with an exposed ACC wire.

                                  VishBK

                                      dudu-lai I should depin this from the canbus connector?

                                          VishBK Yes, remove PIN9 and test the stereo for sound. If there is no sound, PIN9 on the CANBUS side controls the AMP on, then connect the AMP C cable from connector A to the CANBUS box end PIN9

                                              dudu-lai no. Without the canbus you get no sound , the Subaru outback with Harman kardon amplifier required Canbus to get audio with after market headunits. Here is the pin diagram for the original harness

                                              Regards

                                                dudu-lai should i remove this Amp C connection from my harness since you mentioned this amplifier is not controlled via this cable? and what is the solution in this case. I have had 2 different Android Based headunits in the pass on my subaru outback connected with the same cambus and harness combination and they did not cause the thumping or popping noise on boot. so i can confirm this is possible i just dont know with the DUDU7 what is the fix here. thanks for your feedback and support.

                                                    McDudu
                                                    I'm interested in this as well. I have 2016 Subaru Outback with the HK system as well. I don't have issues with the popping on startup but the sound is terrible past mid level with lots of popping and static. Sounds as if the OEM Amp is over powering the speakers. I'm curious if the AMP is wired correctly or not.

                                                        McDudu Is there no sound when the power supply ACC is disconnected from the CANBUS terminal?
                                                        If there is no sound, you can disconnect the power supply of ACC from the CANBUS terminal and then connect the CANBUS terminal using AMP C.

                                                            dudu-lai
                                                            so you are basically trying to control the powering of the oem amplifier using the C control cable. my CANBUS options do not show this power management control for the amplifier. see attached pictures. the hardware i am using is simple soft xp. I will have to take the headunit apart again to try this, please confirm . (side note , since i lasted posted , I updated the headunit to 3.5 beta 3. did not solve any of my issues. so i factory reverted back to 3.5 december release. so right now the unit is in clean state no mods.


                                                                McDudu I will reconfirm with the engineer next Monday

                                                                  Bradha333 Same issue with my subaru 2017, you have to keep the volume super low or your speakers start crackling, and they can get damaged. This is definitely an issue with double amplification. i have lowered the power output dudu7 amp is using but then then issue is the sound is too low. and some songs with different audio levels come at a ok level, others you cant hear and then you get one that blows your speakers. This also creates additional issues if you enable sound profiles. or have the road noise based audio correction features on. I think the answer here would be to be able to disable the Dudu7 internal amp. This is something i have done with other android based headunits in the past which has solve this issues, allowing you to still use equalization and pass the signal to the OEM harman kardon amplifier without pre amplification on it. but i have not found any way to disable the internal dudu7 amp. just lower its sound output which is still pre amped.
                                                                  Maybe someone here knows if there is a way to disable the internal amplifier, and another benefit of that is lower temperatures on the dudu7 itself which is a plus.

                                                                      dudu-lai Removing PIN9 stops the sound, but connecting it to the AMP C cable and updating the MCU does nothing.