OMG - So Annoying Please I Need Your Help Guys - Static Type Noise Aerial/Altenator?

[Tasmaniak]

completly aware. easiest way to eliminate the amp is to hook a speaker directly upto the headunit and disconnect the amp alotgether.

 

[jokerflingo]

Thanks for all the replies guys, i also myself think it is a antenna ground and will try to isolate it asap hopefully this weekend. As i have stated earlier it seems to only be the radio when the car is running, when the car is stopped there is no problem with this radio noise and when i am playing a cd/usb with the car running or off there is no problem either.

Its a real small faint static type noise that drives me insane and i can notice it more in some spots when im driving home from the train station then others, sometimes i think its music based too but its probably just some types of music magnify the problem along with spots where i receive bad signal.

Thanks
Matt.

 

[jokerflingo]

Well just a update, today when i was going down a certain road where i can distinguish this noise easily i swapped from the Radio Tuner On FM to the USB Input several times and every time the USB Input was perfect where as the FM Radio had that sound that drives me insane.

Well Jokerflingo
You should have done the "Big Three Power Cable Upgrade" when installing your gear
By improving the current capacity of three main power cables:
1) extra 100amp alternator positive to battery positive,
2) another 100amp battery negative to chassis,
(important to seperate location from factory)
3) another 100amp braid from engine ground to chassis.
(important to seperate location from factory)
Add additional cables to the factory wiring to handle the extra loads.

Will fix all your crackling spikes and whines :beer chug:

Unsure if this would be related since the system sounds perfect on anything but the radio with the engine running?

 

[Tasmaniak]

It MAY not be the antenna. Whilst it seems logical that it is...it just may not be. How is your amp mounted? Whats it is mounted to? Have you tried having a speaker hooked upto the headunits speaker wires and disconnected the amps? Is the noise still there? Do that, then you will KNOW 100% that it's antenna or it's extension cable.

 

[jokerflingo]

It MAY not be the antenna. Whilst it seems logical that it is...it just may not be. How is your amp mounted? Whats it is mounted to? Have you tried having a speaker hooked upto the headunits speaker wires and disconnected the amps? Is the noise still there? Do that, then you will KNOW 100% that it's antenna or it's extension cable.

The amp is mounted under the passenger seat in my Vs Ute, its ground is one of the passenger seat mounting bolts on the floor. Id be leaning more towards the aerial as it seems when the car is stationary that the noise is almost non distinguishable. Yet when i come to this certain type of downhill it is terrible.
Noise does not change with engine revs/speed so i presume it is not that and it works perfectly on anything but the radio with the engine running. This seems to me where a bad ground could be affecting the radio? Because with the engine running if i have a bad ground on the antenna obviously its going to cause interference compared to when the car is not running. Could this be magnified by times when i have a bad signal area as well?

I would also hope its not the Amp as thats alot of work to rewire etc.

Your help is much appreciated and hopefully i will try to isolate the aerial this weekend.

Matt.

 

[Tasmaniak]

so you simply undid the passenger seat bolt and, slipped the O-ring end over the bolt and clamped it back down?

Dude, that needs to go a bare metal surface...not a painted bolt and buckle. complete contact must be made.

Trust me...put the speaker on the end of the HU and disconnect the amp and check it then.

 

[jokerflingo]

so you simply undid the passenger seat bolt and, slipped the O-ring end over the bolt and clamped it back down?

Dude, that needs to go a bare metal surface...not a painted bolt and buckle. complete contact must be made.

Trust me...put the speaker on the end of the HU and disconnect the amp and check it then.

The bolt it is mounted too has been sanded off back to bare metal and the bolt has been fastened correctly and has been checked with a multimeter for a good earth and seems to be fine as the amp has not cut out.

Hopefully this weekend ill check the antenna earth and if that doesn't make a difference then i guess ill have to destroy my car again to root around with the hu/speakers.

I just would of thought since the usb/cd works perfectly with the car running that the amp wouldn't be the problem?

Also with the amp under the passenger seat where do you recommend to earth/ground it too with pretty much a 1-2 foot cable included?

Thanks
Matt.

 

[Tasmaniak]

straight to the floor pan. Sand back some metal and put the ring terminal straight on the flat metal with 2 or 3 screws to pin it down.

 

[jokerflingo]

straight to the floor pan. Sand back some metal and put the ring terminal straight on the flat metal with 2 or 3 screws to pin it down.

Alright i have almost had it with this noise and about to kill something. I have changed every type of ground including the one you suggested and nothing has changed. The Amp, HU and Antenna grounds have been grounded and regrounded with no benefit.

I am seriously thinking of taking it somewhere to get it looked at but i don't believe they will be able to diagnose it as the noise is a quite faint static noise and without being in the car driving somewhere you wouldn't be able to notice and i highly doubt a expert professional is going to do that.

If i do take it somewhere where should i go in Adelaide as all i know is strathfield?

Any help would still be much appreciated and i am now starting to think it could be the amp but if thats the case wouldn't all amps do it?

Thanks
Matt.

 

[jokerflingo]

K another update guys, i would really like a reply to this one if possible.

This weekend i tried grounding the the amp and the antenna both separately and together to the negative on the battery and both made no difference. Now next weekend i am going to disconnect the the speakers from the amp and just wire them up to the back of the HU.

Only problem is when i get round to doing this what do i do if it does or if it doesn't fix the problem?

If it does fix the problem does that mean its the Amp? And if so what do i do? Its still under warranty but if i take it back to Jb Hi Fi and they take it back to Cadence and cant figure out whats happens? Will they replace, repair or swap it with another of equal value or could this be a problem with all the series of Cadence Amps? Or they could just deny the problem as they wont believe me. Also just randomly could the old tweeters in the dash be causing any problems with the new coaxial speakers in the doors that have their own tweeters possibly? I have always thought about this because of the two tweeters annoying each other and the fact that the wiring must be up in the dash? Any ideas?

If it doesn't fix the problem then i don't know what to think? Could it be bad wiring or again the old stock tweeters interfering with the new coaxial that have their own tweeter?

If all else fails i will have to go to a audio shop and hope they have some ideas as you need very good hearing to hear it and the specialist would have to go for a drive with myself to notice it which i don't see happening.

Your advice is much appreciated as i might be onto something very soon hopefully.

Thanks
Matt.