Help please

ZippyTs · 05:19 AM

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.

Perry Babin · 29th January 2010, 05:21 AM

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.

ZippyTs · 29th January 2010, 05:27 AM

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.

Perry Babin · 29th January 2010, 05:31 AM

If it does it with the head unit alone, check the shield ground on the RCA outputs of the head unit.

ZippyTs · 29th January 2010, 07:10 PM

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)

Perry Babin · 29th January 2010, 07:17 PM

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.

ZippyTs · 29th January 2010, 07:34 PM

They all look good, I am waiting for my iron to warm up and i will hit them all again

Perry Babin · 29th January 2010, 07:36 PM

Do you read 0 ohms from the input shields to the output shields on the RCA jacks?

ZippyTs · 07:44 PM

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

Perry Babin · 29th January 2010, 07:46 PM

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.

29th January 2010, 05:08 AM	#1
ZippyTs diyAudio Member Join Date: Oct 2009 Location: Sacramento, Ca	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. Last edited by ZippyTs; 29th January 2010 at 05:19 AM.

29th January 2010, 05:21 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

29th January 2010, 05:31 AM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	If it does it with the head unit alone, check the shield ground on the RCA outputs of the head unit. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

29th January 2010, 07:17 PM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

29th January 2010, 07:36 PM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Do you read 0 ohms from the input shields to the output shields on the RCA jacks? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links


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29th January 2010, 05:27 AM	#3
ZippyTs diyAudio Member Join Date: Oct 2009 Location: Sacramento, Ca	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.

29th January 2010, 07:10 PM	#5
ZippyTs diyAudio Member Join Date: Oct 2009 Location: Sacramento, Ca	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)

29th January 2010, 07:34 PM	#7
ZippyTs diyAudio Member Join Date: Oct 2009 Location: Sacramento, Ca	They all look good, I am waiting for my iron to warm up and i will hit them all again

29th January 2010, 07:40 PM	#9
ZippyTs diyAudio Member Join Date: Oct 2009 Location: Sacramento, Ca	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.

29th January 2010, 07:46 PM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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