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Old 29th January 2010, 05:08 AM   #1
ZippyTs is offline ZippyTs  United States
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Default Help please

So I got the new setup installed and finished today. Now its just tweaking other than this terrible hiss/white-noise static sound. it is quite loud and very noticeable. Any thoughts on what it might be? I have attached a pic of preamp setup, and can draw out anything else if you need it.

also here is a link to the noise recorded from my phone first at the tweeter then at the midrange from about 6" away from speakers.

Click the image to open in full size.

Last edited by ZippyTs; 29th January 2010 at 05:19 AM.
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Old 29th January 2010, 05:21 AM   #2
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Does it make the same noise if you plug a single set of RCA cables (directly from the head unit, bypassing the crossover) into each of the inputs on either amp?

Be careful if the tweeters are directly connected to the amplifier.
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Old 29th January 2010, 05:27 AM   #3
ZippyTs is offline ZippyTs  United States
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As of yet I have not tried, but will try tomorrow. though all speakers including sub does it. just on speculation I think its the sony. I will also take a pic of it all too so you can see the layout.

Also forgot to mention it does it with the car off or on, and there in not any pitch or change in tone/sound with different rpm's and such.
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Old 29th January 2010, 05:31 AM   #4
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If it does it with the head unit alone, check the shield ground on the RCA outputs of the head unit.
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Old 29th January 2010, 07:10 PM   #5
ZippyTs is offline ZippyTs  United States
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well after disconnecting the sony the sound is all gone. I guess the sony is booboo. Lucky I only spent 5 bux on it. Perry is that something you could repair or should I try it myself (i dont have a scope yet)
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Old 29th January 2010, 07:17 PM   #6
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It may simply have an open shield ground. Pull the board out of it and see if there are any burned traces or bad solder connections on the RCA jacks.
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Old 29th January 2010, 07:34 PM   #7
ZippyTs is offline ZippyTs  United States
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They all look good, I am waiting for my iron to warm up and i will hit them all again
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Old 29th January 2010, 07:36 PM   #8
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Do you read 0 ohms from the input shields to the output shields on the RCA jacks?
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Old 29th January 2010, 07:40 PM   #9
ZippyTs is offline ZippyTs  United States
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the 3 input shields read .4 to .2 ohms using a fluke 117 meter. output shields are all open
input to output or output to output reads open

Last edited by ZippyTs; 29th January 2010 at 07:44 PM.
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Old 29th January 2010, 07:46 PM   #10
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I would expect the output shields to be connected to the input if the input shields read ~0 ohms between them. The output shields are almost certainly supposed to have continuity between them.
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