Speaker popping

[Matt]

it sounds like one of my passenger side front speakers is popping every so often, i've read this is quite common on 406's and is mainly caused by a design fault with the multiplug connector on the headunit.

i was thinking of changing the headunit for a CD player becuause my multichanger doesnt work, but is there anything else that could be causing the popping? it doesnt do it all the time just every so often

Cheers
Matt.

[mbell666]

Is it an exec with the jbl system?

I believe the popping problem is only cars with the jbl system (d9 exec's). Many theories on what causes from bad grounds to bad wiring in different places. Not aware of any one who's actaully fixed it, never managed to on mine.

If it is the jbl system it is not as straight ford as changing the head unit. Jhe jbl system has a power amp in the boot and the normal head unit speaker outputs are connected to this. If you connect up a standard head unit you have an amplified head unit connected to a power amp. This is not good.

You will need a head unit with front and rear pre-outs and connect these in place of the standard speaker connections.

This will only fix the popping if its caused by the head unit or head unit wiring (I always though it was on mine).

[Matt]

thanks, yeah its a d9 exec with the jbl system, i saw someone mention a fix that was on a 406 coupe fourm but i cant see what that fix might be

its a shame they pop otherwise it would be a nice sounding system, i dont want to spend money on a headunit if its not going to fix it, i may have to get a car audio place to look at it

[mbell666]

From memory the coupe (from their forum) fix was connecting an extra ground wire or something. I did some testing on mine and it didn't seem to fix it for me...

Personally i think the problem is at the head unit end, maybe head unit or connector. Tired many things, tie wraps, hot glue gun to stop movement of cables etc but never fixed it

Another head unit may do it, but its trail and error so its your money and time at risk. I never tired that as i dint want to lose the stalk and screen.

[Matt]

I was having a closer look at this today and found that the passenger side tweeter in the front was disconnected because its broke, could that cause popping on other speakers? and where can i get a replacement tweeter from?

[mbell666]

could that cause popping on other speakers?

Doubt it, might it the wires were lose and shorting, but would expect them to be in some kind of connector so that couldn't happen.

and where can i get a replacement tweeter from?

Stealers, scrap yard, ebay..... or might be able to replace it with standard size speaker, not sure sure what size/fitting they are.

[muffindell]

I'm sure from memory that the head units were connected to the amp at normal line level (speaker level). If that is the case then it would cause all sort of problems, amplifying any noise picked up from the head unit or cable (but it is a cheap way of increasing the volume I suppose). When you say 'popping' what do you mean to be accurate?

[Matt]

its a deep pop and sometimes a rumble, first time i heard it i wondered if it was something coming lose on the outside of the car but the next few times confirmed it was those speakers

[muffindell]

Sounds like something switching on and off causing interference. You really need to check your ground is good at the battery end, stereo and amp. Try switching things on and off without the engine running and see if it does it.

[Welly]

By all accounts this noise/interference is caused by a dry joint on the PCB part of the multi plug on the back of the head unit i.e. the PCB board inside the head unit and not the plugs/wiring.

Supafrisk sent hers unit away for repairs but not sure how she got on? it certainly seems only to effect JBL amplified systems.

On my system the noise is a bloody loud bang that scares the crap out of you and any occupants

[muffindell]

Yep, that could do it Welt It's sometimes difficult to give an answer to some of these question, since it could be several different things which you can only sort by trying things yourself

[mbell666]

did look for dry joints on mine but never spotted any, dint go as far as just to re-solder it for the sake but probably should have.

if my memory is right theres two possible places where the dry joints could be, the rear of the socket or where the circuit board with the socket is soldered onto the main pcb.