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JOE
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devnull
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 Posted
- July 9 2006 : 6:44p
| | Does the noise change when you rev the engine or change the speed of the A/C blower? | |
JOE
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Posted
- July 9 2006 : 6:58p
| | i don't even have it turned on. i just put the key on. but yes if i start it and rev the engine it does get louder. the head unit does this with out being on just powered up it seems like something is shorted to an input for the amp. but the other head unit works just fine. | |
devnull
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Posted
- July 9 2006 : 8:49p
| Thats usually a ground loop.
Try re-doing the grounds at the HU and amp. Make sure the connections are solid, and try to ground to a common point, if at all possible.
Also, you can try lifting the ground at one end or the other of the RCA cables. Or, try one of those ground loop isolators, which I've really only had moderate luck with.
Best way would be to opto-isolate your RCAs, or convert to a balanced run, but both of those are kind of impractical unless you are really trying to create an SQ contender. | |
MichaelS
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Posted
- July 9 2006 : 8:52p
| In addition to what Dev said,
I would install an amp turn on relay if you are using amplifiers. It sounds like a very bad ground though.
Joe, I need to talk to you about a lift install....I will call you when I know more. | |
JOE
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Posted
- July 9 2006 : 8:55p
| | i tried new grounds on the hu this morning i did not think the amp grounds could be the issue becouse the other hu worked fine is the avic just that much more sensitive? i feel like an ass i do this stuff for a living and i can't figure out my own truck | |
MichaelS
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Posted
- July 9 2006 : 8:58p
| Just for shits and giggles install the amp turn on relay to make sure you aren't getting any feedback from the amps.
And run a NEW ground to your avic, hopefully you didn't use the one from the stock harness. You should know better though.  | |
JOE
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Posted
- July 9 2006 : 9:03p
| | thanks guys normally i do run a relay for the amps on my stuff but this is a small system for me so i did not think i needed one but i'll try it tomorrow after work. tek call when your ready or if you just need ideas the new direct shop line is 908-561-3354 | |
JOE
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Posted
- July 10 2006 : 6:31p
| | ok i ran all new power and grounds to everything i took out the capacitor i ran the rca's out side the truck i put a relay on the remote leads i still have the same issue anyone please help | |
MichaelS
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Posted
- July 10 2006 : 6:41p
| What brand RCA's are these? Did you solder or crimp all your connections?
What vehicle did this install go into? Make sure your ground at the battery is CLEAN and TIGHT. If it is an older vehicle, your best bet might be to run a new ground wire right to the battery. Before that, I would check the alternator and alternator grounds (if indeed ita an older vehicle).
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Tom in Tacoma
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Posted Wirelessly
- July 10 2006 : 6:44p
| | Joe, have you considered that it's just the head unit? It sounds as if you've tried everything else... | |
JOE
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Posted
- July 10 2006 : 6:59p
| | tek it is my 95 f350 the battery and cables are new the rca sets in it now are the lightning storms from the white truck and you should know better than to ask the solder question tom it may very well be but why did it not do it in the sound board? | |
devnull
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Posted
- July 10 2006 : 7:46p
| Did you try lifting the ground on one end of the RCAs?
Also, try taking a piece of #10 (or larger) wire and run it from the amp's ground point to the AVIC's ground as a test and see if it has any effect on the noise.
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JOE
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Posted
- July 10 2006 : 8:14p
| | Not sure what you mean lifting the rca ground. i ran an 8 gauge wire to the head unit from the frame at the amp ground, no difference. i also tried to put a 4 gauge from the battery all the way back to the cap, and 8 gauge from the cap to all amps and hu still exact same thing. i'm so confused becuase another hu is very clear and no noise at all, and this hu is perfect in the sound board with another set of amps and speakers. now i was talking to a friend of mine who does home theater and his idea is that the hu has a bad internal filter,and the sound board power supply has a good filtering system. what do you guys think of that idea? | |
devnull
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Posted
- July 10 2006 : 8:32p
| Yes, it could be the filters on the HU's internal power supply.
A typical big-ass (useless) cap isn't likely to be tuned for the frequency of the line-noise, but you could try it, or a smaller ceramic cap at the power in's of the HU. Without a scope reading of the noise it's a bit of gueswork figuring out what would be the right value though.
By lifting the ground I mean disconnecting the ground from one end of the RCA run. You can sometimes test this theory by pulling the RCAs out (probably at the amp) just enough so that the outer ground ring is not touching the amp, but the center conductor is still mating with the amp's input jack.
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JOE
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Posted
- July 10 2006 : 8:47p
| | ok i tried it and other than a slight click when you pull it out or put it back in it is the same. if i remove them all completly than it goes away | |
devnull
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Posted
- July 11 2006 : 8:48a
| That sounds like noise is getting coupled into the HU, vs. a basic ground-loop problem (provided that you pulled ALL the RCA's when you did that test).
Try this (sorry to run you through so many tests):
With the truck completely off, pull the HU and jump the hot lead to the turn-on lead. This should make the HU and the amps come on. See if it sounds clean at that stage.
The click the key foward (I *think* that truck has 2 clicks before the crank?) First click should be ACC where some things come on. Second click should be RUN where all other things (blower motors, etc) come on. See if you get the noise in either of those positions.
If it happens in ACC mode, then look for what items are running and start pulling fuses until you find the culprit item and go from there (it's probably going to be a motor of some kind).
If it happens only when running, then it's probably alternator induced. Try cleaning the wires on the ALT, and possibly install a noise-killing cap right at/near the alt.
If none of that helps, get a new HU :) | |
MichaelS
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Posted Wirelessly
- July 11 2006 : 10:34a
| | see joe, two for alternator now. | |
JOE
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Posted
- July 11 2006 : 9:05p
| | thanks for all the help guys. i found it. it was exactly what i thought from the begining, but did not want it to be. i installed a brand new avic n3 tonight and all is good. i just really hoped it was something else that i was missing. thanks again | |
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Need help with my pioneer avic
