aeroplane noise or z z z z z.............on acceleration

[sds]

hi,

my setup is

lotus ref 6" front and tweets
10" lotus ref sub
alpine 701 processor
laudison lrx 6.9

lrx 4.1 mono

active

i hear a aeroplane sound almost like z...........every time .when i accelerate.
the installers says its the amp absorbing the noise from the engine.they tried rewiring still the same.

would could be the cause as they tried many ways still can not solve the problem.
TIA

[sszone]

should be something with the fm antenna thingy
i had the same prob so the audio mod shop did some tweaking for me and the sound was gone

[piggyboyz]

Usually it's the the speaker cables getting interference from the power cable.

If u r driving a E46, then u should have speaker cables on the passenger side cos the power cable is running on the RHS of the car.

[yendor]

What piggyboy said is correct. The RHS of the E46 has a big power cable running front to back. If your hi-fi installer runs some speaker cables (to your hi-low converter) close to the power cables, there will be some 'aeroplane' sound. What needs to be done is to move these cables to the left hand side of the car or down the center (handbrake area). If the any of the cables need to cross the power cables, make sure it crosses at 90 degrees. As for the speaker cables from your amp to speakers, you can just run anyway cos the high current required to drive your speakers will quench all the induced noise.

Cheers

[__iceman__]

To be specific, the most sensitive ones are the audio signal cables, meaning the RCA cables more than the speaker cables.

[sds]

thanks guys for the help. i am driving an e60 so are the power cables on the right hand side or left then.tia

[yendor]

Originally Posted by __iceman__

To be specific, the most sensitive ones are the audio signal cables, meaning the RCA cables more than the speaker cables.

Bro, you are right.. but most installers place the hi-lo converter in the boot left carpet and hence they run some speaker cables from the original cables (Blue and Brown wires) across all corners of the car to the boot. The problem is that hi-lo converters are high impedence (around 600ohms) and hence do not draw the same amount of current from the headunit like speakers do. So induced currents from EMF fields causes a great deal more nosie in the hi-lo output.

The E60 i think also has the power cable running on the driver side. If the battery is in right rear and the slave point in the right front then super high probability that cable in on the right too.

Cheers

[piggyboyz]

Originally Posted by sds

thanks guys for the help. i am driving an e60 so are the power cables on the right hand side or left then.tia

I cannot know for sure but usually dependent on the side of the battery location.

Most of the battery for BMW is on the rear right so the cable is normally on the RHS.

[sds]

my problem still cant be solved.the zzzzzzzzzzzzzzz noise is still persistent.

they have now shifted my amp into the spare tyre well.its dam hot inside and i can feel the amp is scorching hot.there is no ventilation .will my amps spoil inside there.

[oneHeadlight]

which installer ? its ok to post...