whine!!!!

psychofox · Apr 27, 2008

Hi Guys,

installed new speakers

yay!!!

Now there is a whine coming from it

boo!!!

The speakers are amped, installed the same way as my sub (power wire down one side, the other wires down the other side). there is an RCA splitter from my head unit for the speakers and sub, it is earthed in the same place as the other amp, but with on a different bolt (seat belt bolts in boot). the only way i could get the Remote cable connected to the head unit was to splice them (two wires into one conection). Other then that, i believe it is wired correctly.

The whine happens when i accelerate, or use any electrics in the car.

How can i get rid of this? :bang: as it is doing my head in.

Edit: Just realised if i unplug the the remote wire, the wine sops (as well as the new speakers and sub), could the remote be what is causing it?

Luke M · Apr 27, 2008

i might be wrong but i thought you should earth all amps to the same point and bolt.

psychofox · Apr 27, 2008

mog1571 said:
i might be wrong but i thought you should earth all amps to the same point and bolt.

Really?
so it's wrong if its in the same place, just a different bolt?

paulbfd · Apr 28, 2008

I always earth to the same point.

Did you scrape away any paint so the earth point was against bare metal?

volxstu · Apr 28, 2008

Dont forget your ground loop isolators that should do the trick they just connect to the RCA cables. and yes earth to the same position the more loops you have the more chance of interfearance.

psychofox · Apr 28, 2008

I will earth to the same point and see if that makes a change.

Where can i get the ground loop isolaters?

volxstu · Apr 28, 2008

psychofox said:
I will earth to the same point and see if that makes a change.

Where can i get the ground loop isolaters?

Just type it into Maplin's or ebay i wouldnt really have a clue which is a good quality one and which isnt but you can necer go wrong with Autoleads really can you.

I just had a look on Ebay and there seems to be a massive influx of them they are obviosly getting popular so as i always say with car audio you get what you pay for.

psychofox · Apr 28, 2008

volxstu said:
Just type it into Maplin's or ebay i wouldnt really have a clue which is a good quality one and which isnt but you can necer go wrong with Autoleads really can you.

I just had a look on Ebay and there seems to be a massive influx of them they are obviosly getting popular so as i always say with car audio you get what you pay for.

had a look on maplins, £10 is that reasonable?

volxstu · Apr 28, 2008

psychofox said:
had a look on maplins, £10 is that reasonable?

Right well im not too sure about the Quality of some of the Maplin stuff but that could just be me it just seems a bit too Radio Shack who went bust for being well... crap.
I had a look on ebay and this seems to be about the same as what maplin are offereing
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&Item=260234758764&Category=14932&_trksid=p3907.m29
But i do quite like the look of.
http://cgi.ebay.co.uk/CAR-AUDIO-TUN...ryZ14932QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
Im not too sure on how you rate one of these things so i will have a look and find out.

Xen · Apr 28, 2008

https://www.fiatforum.com/ice-guides/135760-audio-interference-how-why-what-do.html

psychofox · Apr 30, 2008

Right, so far i have moved the earth wire so it is on the same bolt as the one for the other amp, same whine sound :bang:

Captain Mike · Apr 30, 2008

psychofox said:
Right, so far i have moved the earth wire so it is on the same bolt as the one for the other amp, samne whine sound :bang:

is the noise like this:

eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

or this:

eiiooooooooeeieiieieoeeooeeiieieieoeoieoeiioeoei ?????

psychofox · Apr 30, 2008

Xen said:
https://www.fiatforum.com/ice-guides/135760-audio-interference-how-why-what-do.html

Had a look at this (thanks for that).

Run power lines and RCA cables down seperate sides of the car. - Done
- Use shielded RCA cables. - Done
- Only use cables of the length you require - measure up and buy the shortest cable that will reach. - Done
- If avoidable, don't wind up the excess. - not winded
- Consider using ferrite rings on your cables. - where can i get a ferrite ring?
- Consider fitting a suppression capacitor to the alternator. - where can i get this, is it easy to fit?
- Ensure you have a good earth. - think it good (same place as 1st one which worked fine).
- Ensure the head unit has a power supply choke. - where can i get this, is it easy to fit?

psychofox · Apr 30, 2008

j1ppers said:
is the noise like this:

eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

QUOTE]

Like that, when the electrics are used and accelerator. Its very loud.

Xen · Apr 30, 2008

what solution you need depends on what is causing the problem tbh. does the pitch of the whine alter with engine speed? what about when the car is off and just using the audio equiptment with ignition off?
Is the whine only through one amp or both? If you disconnect the remote wire to the old amp and speakers, does the new setup still whine?

psychofox · Apr 30, 2008

Xen said:
what solution you need depends on what is causing the problem tbh. does the pitch of the whine alter with engine speed? what about when the car is off and just using the audio equiptment with ignition off?
Is the whine only through one amp or both? If you disconnect the remote wire to the old amp and speakers, does the new setup still whine?

The pitch does change the quicker i go, and it sounds perfect when the engine is off (no whine at all). The remote's are crimped together (HU end), im not sure if the whine is there or not as if i disconnect it, both turn off.

Xen · Apr 30, 2008

i'd try disconnect the old amps remote wire first and make sure that isn't interfering with the new one (if it is, theres a way around it so don't panic

)

Sounds like alternator interference to me tho, so a suppression capacitor may be required. A ground loop isolator from maplins would also do the trick, but im not a fan of them.... it affects the sound quality at low frequency due to the way they work (cutting out low frequency signals)

psychofox · May 1, 2008

Xen said:
i'd try disconnect the old amps remote wire first and make sure that isn't interfering with the new one (if it is, theres a way around it so don't panic )

Sounds like alternator interference to me tho, so a suppression capacitor may be required. A ground loop isolator from maplins would also do the trick, but im not a fan of them.... it affects the sound quality at low frequency due to the way they work (cutting out low frequency signals)

Thanks i'll try this at the weekend.
Where would i get a suppression capacitor?

toddjeffery01 · May 2, 2008

So your using the same signal from the head unit to power your sub and speakers? on a rca splitter? if so im sure you should be using wires for the Front speakers going to your amp power your speakers and the one for the sub either Rear or Sub wires, The wine has to be an interference from other electrical equipment, also if you have 2 amps, make sure you splite the live before you connect to your amps, you cant branch from one +12v to the other, becuase effectively your running them in series not parrelle.

Xen · May 2, 2008

If hes running a 4 channel amp for his speakers tho, he won't have any choice but to split the signal to the sub. I'm starting to doubt the problem is signal related though if only the sub is getting interference.
series would be the neg of one amp to the pos of the other. Either way you mentioned would both be parrellel, but patching from one directly to the other would restrict the current allowed to the second amp if the cabling wasn't thick enough. I do think your right in that the interference could be power related rather than signal related though.

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