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Old 10-30-2013, 07:05 PM
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Default Hum at 0 volume

OK to start with I have located the source but having hard time believing. It's the first time in 40some years of audio I have encountered such a problem. I had a 4 channel amp I replaced with a CT sounds 60.4. The previous amp had a input selection switch 2 channel 4 channel. So the last amp had one RCA ran to the amp. My arsenal jvc deck has 3 sets of rcas so I ran an additional set I happened to have which are new. That's when the hum started? I think? (because the HU always had one set to mono and one set to amp with input selector switch) First thing I did was locate the source of hum which took less than a minuet. I started switching and removing RCAs. The first one I removed stop that side's hum so I pulled the other channels RCA which stopped the other side's hum. They were the new RCAs? Hmmm I thought It's the new set? Well I pulled the HU and ran another new set I have to the out puts of the HU which I pulled the others from. Hum back again. Now I switched RCAs on back of deck and that's when I discovered that the hum starts when the additional RCAs are hooked up. Now I'm think'n it's the amp? So I run one set per front and rear inputs of amp at a time. Same deal but it dose not matter if front or rears are hooked up the hum dose not start till the second set is hooked up. I do not have a extra deck lying around at the moment so I pull out some new wyes and hook them up to a single (front or rear dose not matter)HU output RCA and voila the hum is gone! I'm half ass happy now? But I will probably think about it till I can finger it out! This is the crap that kills me ! Ok so in my 40 years plus have I ever had a HU do this. And without having another deck to know for sure if the HU has a short or grounding issue on it's front and rear RCAs I will lose sleep Really this crap drives me crazy! So before I lose my cool and head has anyone here had or heard of such a situation before? Thank's for any ideas or suggestions
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Old 10-30-2013, 07:30 PM
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Default Hum at 0 volume

Do you still have the amp that the CT replaced? If so, put it back in and put its switch on 4 channel and see if the noise is still there.
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Old 10-31-2013, 09:50 AM
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Maybe I did not make that part clear? But the CT amp hasn't a 2 channel 4 channel input switch. That's the only thing I could complain about, other than that it's a great little amp Anyways thanks for your input!
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Old 10-31-2013, 10:30 AM
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I think joens500 was saying to swap back the old amp and see if it also hums when ran off the 4 inputs.

I think you are spot on with troubleshooting it, sounds like a bad ground on one of the rca output/input. Have you tried coupling all the grounds on the decks rca's? I think its called ground loop where one ground is not at the same reference voltage as the other, creating a current that makes noise. Since you are getting clean signal with one connection and noise with two, I would start with grounding the rca's together.
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Old 10-31-2013, 10:31 AM
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did you try grounding the additional/second set of RCAs? what vehicle is this in?
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Old 10-31-2013, 10:42 AM
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Quote:
Originally Posted by lunchbox View Post
I think joens500 was saying to swap back the old amp and see if it also hums when ran off the 4 inputs.

I think you are spot on with troubleshooting it, sounds like a bad ground on one of the rca output/input. Have you tried coupling all the grounds on the decks rca's? I think its called ground loop where one ground is not at the same reference voltage as the other, creating a current that makes noise. Since you are getting clean signal with one connection and noise with two, I would start with grounding the rca's together.
Nope craig'd it all ready. Haven't tried grounding RCAs together yet. But will be my next move. Thanks
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Old 10-31-2013, 10:47 AM
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Originally Posted by fasfocus00 View Post
did you try grounding the additional/second set of RCAs? what vehicle is this in?
99 Cherokee. Never had to ground RCAs together before. The deck is about 3 years old but never had the 3rd RCA connected till I bought the CT amp. Will try ground'n RCAs and see what that dose next. Thanks man
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Old 10-31-2013, 11:08 AM
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They could have been bad this whole time and you never knew, or plug/unplugging it on this last swap worked a solder connection loose. I would also try gently(key word) wiggling the rca connections on both deck and amp to see if it is a bad connection.
Good luck.
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Old 10-31-2013, 11:56 AM
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Quote:
Originally Posted by lunchbox View Post
They could have been bad this whole time and you never knew, or plug/unplugging it on this last swap worked a solder connection loose. I would also try gently(key word) wiggling the rca connections on both deck and amp to see if it is a bad connection.
Good luck.
Tried that already too. I have new RCAs I tied as well. I need to outfit the tacoma with BT so I might buy a new deck! Thanks man
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