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D2 - Sat Nav, ICE, Audio & TV All in car entertainment discussions

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  #1  
Old 6th November 2015, 10:06 PM
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iGO iGO is offline
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Default Aftermarket unit install / popping noise in speakers

Hi everyone
Today got last lead for my Pioneer mechless unit install.
Replacing RNS-D with Bose.
When I connected everything together and power on stereo the popping noise came from speaker. Its happens every time when I switch power, change sources, changing song or searching radio station

Any ideas?

My setup


Thanks
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Old 7th November 2015, 01:04 AM
tipptop tipptop is offline
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How is your new headunit sending out its signal? Speaker level or rca line level? I presume the D2 bose is fully amped, so how are you sending a signal to the bose amp? The original headunit was probably sending a tiny pre amp signal to the bose amp to be amplified out to the speakers, now you may be sending an already amped signal out to be amplified by the bose amp again resulting in noise.

Again im not sure of the D2 setup but on other models like A4 A6 half amplified systems the front speakers were powered directly from the headunit and the rear speakers and sub were powered by an amp. You had to send a pre amp rca signal from the new headunit to the stock amp to cut out the buzzing and popping from the rear. The fronts were fine as they were already powered by speaker level output from the symphony or concert headunit.

Hope this makes sense. I've never tinkered with a bose system just the half amplified non bose versions and the fix for buzzing and popping noise on that was to cut an rca cable, connect the positives and grounds together, plug it into the pre amp rca port on the back of the new headunit and send it to the amp.

Edit just seen your pic and it looks like your cable is taking its signal at pre amp rca level. So ignore my babbling above. All i can say is make sure everything is tight and well connected, maybe ground the case of the pioneer to a good solid ground.
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Last edited by tipptop; 7th November 2015 at 01:10 AM.
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Old 5th December 2015, 05:44 PM
MikkiJayne MikkiJayne is offline
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I had something similar in my C5 - it would thump every time I turned it off. It ended up being a ground loop. Can't remember whether it was because the amp input ground was connected to the head unit or not connected, but a ground loop isolator fixed it so that might be worth a try
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