Wiredwrx

Hello Will and everyone.

Hoping for some help.

Current setup:
M2-ATX
SV24
Using on board sound
Powring the some USB ports off the M2, some through the MB
Using AUX IN on crappy "Rampage" HU
High/constant power from battery to distribution blolck, all devices constant power from there.
Acc power from single sourcen all accessory power taken from the same point.
All ground itens grounded to the exact same point using same gauge of wire used for power.

I get some electrical noise from the computer. grounding the all metal case to the same ground point improved the situation.

But, I get heavy engine whine disconnected the computer from the headunit, and noise went away.

Checked the carputer with earphones, no noise. Used an Ipod thriugh the HU, no noise. Disconnected antenna from HU, no improvement. Grounded the chassis of the HU to the same ground point, no change.

It's gotta be in the patch cable between the catputer and the HU. Is there a more " proper" solution then a GLI?? Do you think I should try a balun or a choke first/also??

Any help is greatly appreciated, thanks in advance.

Michael

__________________
...I love the French language...especially to curse with...Nom de Dieu de putain de bordel de merde de saloperies de connards d'enculés de ta mère. You see, it's like wiping your *** with silk, I love it. www.yellinlawoffice.com

RedGTiVR6

So when you disconect the computer from the HU your noise goes away?

I hate to say it, but Rampage is not known for being even remotely high quality. If you've checked all your connects, all of your solder points are solid, and wires are not crossed, then I'd questions your RCA.

What kind of cable are you using? Is it shielded? Is it the Rampage quality RCA as well?

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Nomader

hello.. good thread!!
I just installed everything.. and guess what. I am getting noise.. let me explain.
I have moved my head unit back in the trunk. by extending all the cables of the ISO connector all the way to the trunk. the HU works perfectly alone.. no problem there (by the way it is a veeery good Blaupunkt HU). Now I use the AUX in cable for blaupunkt which is not rca just a plain headphone jack that plugs directly into the soundcard..
I don't have noise when using headphones.
I don't have noise when using the HU alone.

so I guess the thing grounds through the Aux In cable right?
I had 2 noises.. one noise was constant.. it was there even when engine not running..(hard disk and mouse noises) the second was the whine which gets worse when i rev up..

iI used a good ground position..I tried to remove the ground cable from the ISO connector of the HU and ground the HU in the same ground with the PC...did not help a lot..
what i did and it actually removed the first noise was to place the HU on the metal case of my PC..that removed the hard disk nise by 95% and reduced the alternator whine by say 60%.. I stil heare that bird sing any ideas how to remove it 100%??

I am using 4 AWG wires from the battery (for future expantions then 12 awg for the PC - just for 50 cm long) the ground is also 4 AWG and then it gets to 12 AWG (as the 4 AWG won't fit in the DSATX)

Wiredwrx

Thanks for the response Red. I know Rampage is crap, but I didn't think it would cause this problem, and it was cheap.

The ONLY time there is noise is when they are connected together. Also, while it does get worse once the computer is started, even if it off, but has power and get, there is whine.

I am using a " patch cabe" between audio out of the carputer and aux in. It is a 3 conductor cable, and I am almosy certain it is shielded. Could be "rampage" quality. I have some "quality" rca's available, but not looking forward to all the gender changers and stuff like that.


Thanks
Michael

__________________
...I love the French language...especially to curse with...Nom de Dieu de putain de bordel de merde de saloperies de connards d'enculés de ta mère. You see, it's like wiping your *** with silk, I love it. www.yellinlawoffice.com

RedGTiVR6

ok - so is there noise when it's JUST the hu?

Can you possibly find a link to the type of cables you're using?

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Wiredwrx

There is no noise from the headunit IF the cable is disconnected from the computer, but once connected, there is noise as long as the carputer is getting power, wether on or off. If I plug an ipod into the HU using the same cable, there is no noise.

The cable I have has a 1/8 mini plug on both ends, that is three conductors. Both end would fit into the earphone jack of an IPOD, so if you at a pair of headphones, you will see what kind of connectors it has on both ends. This also fits directly into my HU's aux in jack. The connectors have a 6 foot length of 2 conductor and a 3rd that is a shield. I would give you a link, but I am currently on my Blackberry, and don't have the "luxury" of navigating between windows to cut and paste a link, sorry.

EDIT: Got to a computer, here is the link http://www.allelectronics.com/cgi-bin/item/CB-121/117/6"#39;_CABLE_W__3.5MM_STEREO_PHONE_PLUGS_.html
Michael

__________________
...I love the French language...especially to curse with...Nom de Dieu de putain de bordel de merde de saloperies de connards d'enculés de ta mère. You see, it's like wiping your *** with silk, I love it. www.yellinlawoffice.com

Will Albers

When you hook up the ipod, are you running it off of the ipod battery or do you have it powered by the cig lighter?

If its the first, its telling you that the head unit is producing noise outside of ground loops, which it is not. If its the later, im amazed

You have a ground loop between your PC and HU. No way around it. Grab a ground loop isolator and test it. If the noise goes away then its 100% a ground loop between the PC and the deck

But then the problem is which is the culpret?

I would yank the deck, connect it to the same power source as the PC and leave the deck right on top of the PC. Hook it up to a speaker and a very small RCA. Check if the noise goes away. Ground the chassis of the deck to the same point, check to see if the noise goes away. If the noise is still there, then we are in trouble.

I'm going to go out on a limb and say that the rampage deck's internals are pretty crappy. They have not isolated the aux in on the deck from chassis gound forcing a ground loop no matter what you do. Your only choice is a new deck or ground loop isolator to make up for the bad design.

Maybe its time to invest ina new deck with a decent design? Any available on the classified forum?

Wiredwrx

By the ipod battery, so I guess you not amazed


I'm tending to think that is the case.


Well, they ARE taking power and ground from the same wires in the same physical location.


I'll try a different, single speaker on the HU, but the car is 10 years old, and I am almost sure that there is no crossover or external amp to cause problems. Can I use an 8 ohm speaker, or do I need a 4 ohm one??

[quote=Will Albers] Ground the chassis of the deck to the same point, check to see if the noise goes away. If the noise is still there, then we are in trouble.

Well, I grounded the HU chassis to the same wires that ground the carputer and the HU, it made no difference. Only grounding the carputer chassis helped with the RFI a little, but I am more concerned with the engine whine.

[quote=Will Albers]I'm going to go out on a limb and say that the rampage deck's internals are pretty crappy. They have not isolated the aux in on the deck from chassis gound forcing a ground loop no matter what you do. Your only choice is a new deck or ground loop isolator to make up for the bad design.

Then a GLI it is. I am fine with a bandaid, as long as the booboo goes away.


Hmmmm, I will think about it, but chances are, unless it is ACTUALLY the HU, I will still have engine whine.

__________________
...I love the French language...especially to curse with...Nom de Dieu de putain de bordel de merde de saloperies de connards d'enculés de ta mère. You see, it's like wiping your *** with silk, I love it. www.yellinlawoffice.com

nemo1

Hi All,

I am having the same problem. I am connecting the output of my sound card to the HU. I get the aeroplane sound. Tried sound card to headphones and its ok then tried using PDA to Hu and it is also ok but when I connect sound card to HU the problem is there again. I ask around about the noise isolator and the sales person tells me that it will reduce the bass level if I install the noise isolator. Any way to fix this? Pls. help..

Many many thanks

Wiredwrx

So, the GLI fixed the problem.

Thanks
Michael

__________________
...I love the French language...especially to curse with...Nom de Dieu de putain de bordel de merde de saloperies de connards d'enculés de ta mère. You see, it's like wiping your *** with silk, I love it. www.yellinlawoffice.com

Nomader

if you check my post a few threads above u will see i had similar problems.. what did solve my problem is that I removed the ground from the HU ISO plug and i ran a 12 AWG ( i wish i had 10 awg..) from the HU case to the PC case.. that took away most of the noise.. then i bought a ground loop isolator which did not effect the sound quality at all.. i feel that it is even better (as it removed the noises even those that u don't notice) and bass is even better. and that removed all the remaining noises.. so veeery happy now.
I tottaly disagree that isolators effect the sound quality.. if u think of it they are just magnetic transformers with a 1:1 ratio..they let music pass through (magnetically) but DC current is blocked.

nemo1

Thank You Nomader...I will try it out and post the outcome...

nemo1

Nomader...after reading your threads, I noticed that you are using a Blaupunkt HU. I am also using a Blaupunkt HU, there are many cables running out from the HU ISO plug, how do you know which one is the ground?

thanks again

Nomader

As far as I know all Blaupunkt HU use the ISO plug.. it is the black cable (usually) DO NOT run the unit without any ground cable at all.. very dangerous it will burn your HU or cables as it will ground itself through any other cable it will find (speaker etc.).

take your time.. remove the connectors cut the small ground wire in the ISO plug. then ground it either on the pc case or into the same position you have grounded your pc (this cable sould be as short as possible and as thick as possible) try which gives you less noise. try to remove as much noise as possible before using the isolator. (sounds easier saying it than doing it)

you can download the manual of your HU from the blaupunkt site, if you don't have it. it has the diagams..if it is different than this one

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Will Albers

Thats good, sort of. Its a ground loop between the deck and PC, the GLI is a band-aid. I would still like to know the culpret (deck ) but if its workin, let it be and enjoy!