• HW Installation Support

  • Speaker Amplifier Sudden Thump/Bass pop at ignition on and off

I am using factory amplifier and optical decoder box. When system starts and turns off. Sub makes a very loud sound. Any one resolve this?

    Duomax I to am having the same issue but I think mine is from the dsp. I have a new showing up tonight so will see

      Is there a separate dsp and power amp?
      There's a current surge sound at startup and shutdown, most likely caused by an aftermarket dsp or power amp.

      it is a mercedes w211 with harman kardon sound system. the optical decoder box is plugging and sending sound directly to the oem amplifier.

        Duomax try powering you dac from a source other than your car. Run an extension cord and use a usb brick or power bank and see if that makes a difference

          I tried plugging in an input into the box from an external source. I had my phone to rca directly to most box and have the same issue. Whats your situation?

          I have the same problem using a Helix M6 DSP amplifier. Loud pop when I shut down the system. I use Dudu7 headunit.

          Same problem. 2017 wrangler with the factory Alpine stereo upgrade/amp/sub. Loud pop on start.

            Same problem here. Toyota Camry XLE 2005 with JBL amp, Hiworld Canbus.

            Duomax RCA to optical audio conversion? There are two ways to do this
            1: You can add audio isolators to the RCAs.
            2: Add a delay starter on the power supply of the fiber optic decoder box (when the radio starts, delay 2-3 seconds before the fiber optic decoder box works).

              hrtloop Which CANBUS was selected?

                  dudu-lai Apologies, I should have included this:

                      hrtloop Do you use Telegram? Please contact me at LSDUDUlai and I will send you the test software.

                        17 days later

                        I just installed dudu7 yesterday Subaru outback 2017 with OEM Harman kardon amp.and speakers using simple cambus and I am experimenting this exact same problem o happy about getting. This loud pop worry my speakers or amp.could get damaged. Can you share the solution to this .