I have vifa tweeter that powered up by massive audio amp and I'm getting this constant high pitched noise sound out of the tweeters when they are on low volume. It's not loud by any means by I can definitely hear it.

The sound change with engine speed but not very loud...

When I turn the volume up the noise sound is masked by the music, but it comes back when I turn the volume back down.

The sound still remains even with the gain down below half way.

What i have done is adding extra grounding for alternator and battery that mounted to chassis but the noise still noticeable.

What would be the problem here?

Need help from all sifus here......

TQ......

Aha I have this same problem

it's due to the alternator charging

are your RCA and power cables next to each other, maybe the emag flux transfer over

Are you using pioneer HU by any chance?
http://www.diymobileaudio.com/forum/techni...ator-whine.html

Else I dunno what to do. Some sifu can give other solution for both of us?

spacelion: yes... im using pioneer hu... i located my RCA separately with the power cable... so should be no emag flux transfer over.


im installed my audio equipment according to normal practice.

i have try to used other tweeter but the hissing sound still there....

when im disconnect my RCA for front stage from the amp.... the sound immediately disappear....

from that... i know... grounding for the amp working perfectly....

IMO.... could be the pico fuse trigger the problem....

but at the end...... im not sure whether the pico fuse causes the problem or there are other problems like grounding or something else.

the hissing sound really messed up my front stage..... so cannot really enjoy the music....

please advise both of us......

tq

spacelion: i hve read that thread.... its about RCA grounding right? but..... it tat safe to practice tat RCA grounding?..... im afraid it will cause fire...
some thread not suggest to perform that procedure.....
nway
need more clarifications from our ICE sifus here.....

the famous pico fuse issue...

send your HU back for a pico fuse change... if you dont want to ground it... ground it sometimes takes away the whine.... but the hiss is still there...

so best is to have it replaced.

and when you reinstall your HU or do something to your HU next time...

make sure... you take away the keys from the car so that your installer will not make the same ol' mistakes again...

craziechild: if i use the ground loop accessory...... the hissing and whine sound will disappear permanently ? n how do u know its pico fuse.... mybe u can share a little bit how to diagnose regarding this pico fuse...

what im afraid... maybe its from poor factory grounding.....

give me headache.... tired relocated the grounding for billions times... but at the end.... the result remain same....

wat's ur hu max volumn and ur normal listening volumn level?

howiechoo: my max volume 4 hu is 62..... normally i listening around 16 to 20....

most probably ur gain is too high,,it pick up noise,,,,a typical pioneer hu give the best signal to noise ratio at around 35-42 clicks....

howiechoo: the hissing sound still remains even with the gain down below half way.....

hissing and whining noise is different. hissing is cause by electrical component or wiring issues,,,whining can cause by gain, wiring and component issues

howiechoo: from what i understands..... whining noise mostly like aeroplane sound and the hissing noise like static sound.... what im facing now is hissing noise problem.... and when the accelerator pressed.... the hissing noise became louder enough to heard even with 0 clicks on the hu volume.... and the hissing remain constant on volume when the accelerator not pressed...... when i turned the volume up to 20 clicks... the hissing noise blend together with the music....

what i have done to get rid the hissing sound are:

1. extra grounding for alternator and battery that mounted to scraped car body (0 gauge wire size).
2. relocated grounding for amp for many times until myself lost counted on it.
3. extra grounding for hu and mounted to scraped car body from back of the hu (10 gauge wire)
4. located the power cable, grounding, remote separately from rca and wire speaker to avoid electromagnetic flux transfer effect.
5. using different rca (stinger,pg, monster)
6. changing to others tweeter
7. re-tune the amp and electronic crossover gain

but at the end.... the hissing noise still there...

When u do the additional grounding ... Does it improve ?
If the noise react to your gas pedal ... Then it is a ground loop.

In a car .. Noise come from 3 main source ...
1) ignition system / alternator.
2) ground loop
3) power / signal wiring interference

I would systematically work on these 3 areas..

For ignition system / alternator :
1) install filter cap (helix head caps) on alternator
2) ground engine compartment
3) install power stabilizer
4) install filter caps on HU and amps.

For ground loop :
run a separate zero gauge cable from battery to (power distributor box for amps) as ground.
( car body is not the ideal ground, copper is a much better conductor than steel ).
Use this cable as negative reference for all components ..amps, HU.
Ground the body of your HU separate too.

Power / signal wiring interference :
Separate power n RCA wiring.

The principle is to reduce the noise floor .. Thus allowing your amps to amplify pure signal ISO noise.

Klman888: Yes.... the hissing sound reacted when the gas pedal pressed

what do u mean is to run separate grounding wire from negative terminal of the battery and hock all component, amp or hu grounding to this points?

n 1 more thing, wat kind of filter cap do u use for alternator? never heard it before bro....

nway.. thanks for u respond

Helix cap 33, 33 microfarad cap designed to reduce alternator noise.
U install it between alternator n battery.

Normal practice is to use the car body as ground. U scrap till bare metal n connect your negative terminals there.
A better way is to run a zero gauge from the battery negative terminal to rear of car. U then connect all negative terminal to this zero gauge cable.

For your case, I would start with grounding your engine compartment n install a power stabilizer first.
Eg.. Pivot raizin or similar.

Electrical noise is inherent in a car, u can only reduce it, elimination is not possible.

Have fun

its the pico fuse...

dun add anything till you get your pico fuse replaced... you will be wasting your brain juice if its not replaced...

the pico fuse issue is the ground loop within your HU... do anything to your already good ground looped ride... is just a waste of brain juice...

http://www.then16files.com/2007/03/helix-cap-33.html

craziechild: i will try to switch to the other hu n c wat happen..... if there are no improvements in my system.... then i will proceed to Klman888 methods

Klman888: Gonna try u method bro after i switch to other hu...

sentinal3_16: thanks for the link bro

Haha... As long as it helps...
Keep us informed on your progress.
Have fun.

Klman888: sure.... will inform u guys the results after switching to other hu.... n 1 more questions bro... r u using tat helix cap 33? n how much it cost?

This post has been edited by Zzzini: Feb 10 2014, 03:32 PM