I'm no expert, but son used to be an audio fitter for Halfords, and he tends to agree that loose fitting connectors will cause interference through the speakers and also badly laid cables can be a problem. :eusa-think:
But he also said there could be many other reasons for audio interference, ie :
EMI - ElectroMagnetic Interference & RFI - Radio Frequency Interference.
Here's what he sort of said :crazy:
- Even in the newest of cars, the current supplied from the alternator is not 'clean,' due to the way contacts are constantly being switch within the alternator as it spins. This causes the current in power lines connected to the same battery to fluctuate very slightly and very rapidly. This is also the reason for a whine increasing in pitch with engine speed.
- Coil packs for spark plugs are constantly charging and uncharging, there rate dependent on engine speed as well.
- Indicators are causing a constant load and unload on the entire system when being used, causing the current to fluctuate.
- Electronic PAS motors are taking large amounts of current in uneven patterns, causing the current to fluctuate.
- Due to the nature of a permanent magnet motor, where contacts are constantly being switched as the amateur rotates, current fluctuates. Hence using wipers, electric windows etc can cause interference.
- Even the audio system itself is drawing power in an uneven fashion to provide current for powerful bass notes etc.
In other words, there's hell of a lot of electrical components that could cause bad sound through the speakers.
Good earths are essential, all connections must be sound , powered cables and audio cables should not be running inline with each other.
So basically a good audio installation would be something like :
- Run power lines and RCA cables down separate sides of the car.
- Use shielded RCA cables.
- Only use cables of the length you require - measure up and buy the shortest cable that will reach.
- If avoidable, don't wind up the excess.
- Consider using ferrite rings on your cables.
- Consider fitting a suppression capacitor to the alternator.
- Ensure you have a good earth.
- Ensure the head unit has a power supply choke.
Anyway Tomas best bet take it back under warranty and let them sort it out, I would imagine that all the above has been covered and your problem is down to something simple. :thumbup: