RCA Pre-Out Making Producing a Mumming and a Popping Sound.
The unit sounded o.k. for during the first six months of use. Just recently, mostly when I first start the car the subwoofers connected to the amp starts to hum and pop in a rhytum. I tried new RCA cables but that didn't work. I have a 2002 Nissian Altima. The humming sounds simular to ground loop, but my ground cables to the amp are of proper gage and are no longer than 20 inches. Is it because of the negative ground factory speakers that came with the car ?
An expert who has achieved level 3 by getting 1000 points
An expert that got 10 achievements.
An expert that got 5 achievements.
An expert who has answered 1,000 questions.
Re: RCA Pre-Out Making Producing a Mumming and a Popping...
The speakers hook to speaker wires not to any thing else no power no negative poles do you have a remote shut off switch connected to amp this would be important to cut off amp
when cut off amp if you still here the humming this can be an indicator of low power being produced by alternator alternators produce 14 anything below 12 would mean replacement of alternator
if alternator fine then you need to find new ground for amp and make sure you have a good ground for sterio this can be checked with a test light
to check a ground all you do is hook gator clip to power then touch test light end to ground on radio end light comes on got a good ground (make sure not to touch any other sterio wires just the ground wire while connected to power to check grounds)
if pulsing in test light on the ground means you have a bad ground
just disconnect move to better ground
check the amp ground the same way as decribed above
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Make sure RCA is on threw head unit,
2.make sure you have good cables
3.most ken units have 2 sets of RCA
hook ups one is for cd/changer the other
is a low pass for amp.
4 you have bad RCA channels send to
kenwood for service
If the amplifier itself is making the popping sound I suggest you disconnect it immediately, as it could be an electrical short within the amp. If the popping sound is actually coming from the speakers, it could be due to a crossed wire, blown amp channel, or blown speaker. If you posses the technical know-how, you can test the amp channel and speaker by connecting a different speaker to the channel responsible for the popping sound. If the new speaker makes the same popping noise then it is most likely a blown channel. I hope this helps =)
High chance that the fault was not came from the wiring but in the unit itself. This kind of symptoms is an indication that there is a bad solder joints (cracked, dried, cold solder) in the sound output circuitry. This circuitry is responsible for producing sound and feeds to your speakers. Since the unit is totally muted(no sound), this circuitry is disable due to said reasons. The only way to back it from normal operation, it needs to take apart and re-solder the joints in this circuitry. You need an assistance of a qualified technician to do this job.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.
It sounds like you have some wiring issues, moreso issues with your speaker wiring, or your speakers. I would first test the speakers, 1 by 1 using a double A, or AA 1.5v battery. Each speaker wire pair should be tested by attaching 1 wire to the negative side of the batter, and momentarily making contact with the other wire to the positive side of the battery. A low popping/scratching sound should be heard from each speaker. If not, replace each defective unit. Also, double check your wires to ensure they are not damaged.
Ground Loop Isolators are nice, but if you want truly crystal clear sound, you will need to run a common ground. All electronics will need to be run close to the amp, as more than about 3 feet of ground wire from the amp can cause sound issues. When I ran my common ground, I connected my radio and satellite together, and ran one sigle ground wire to the backseat of my car, where the amp grounds are located. This will optimize the clarity of the sound coming through the speakers. For the popping sound in the speakers when the car is powered on or off, you need to see if the radio itself has a wire to power the remote connection on the amp. Most of the time, they will, and this is the wire you will use to turn on the amp itself, as it delays each item powering on and reduces the chance of popping in the speakers. DO NOT run the remote wire from the amp to the accessory wire of the radio, as this will cause the popping sound you are hearing. If the radio does not have an Amp Turn-on wire, then you may need to improvise by using an accessory wire in another location, but even this is may cause popping as well. The pop comes from multiple things turning on at once, so the Amp Turn-on wire delays the amps for just a moment, preventing the pops.
Does the stereo have a switch in the back that switches between Amp and Pre-Amp ? Some units mute the high level speaker output if it's switched to pre-amp mode in the case where you would use the RCA jacks to route the low level audio to external amplifiers. I can you further if you give me the make and model. Also, good info could be found on details of your unit at www.crutchfield.com.
It sounds like the preamp wire that carries the left channel signal between the HU and the 2ch amp has an issue. Here's two quick things to check.
Check that both ends of the left preamp cable between the deck and 2ch amp is not loose or disconnected.
Swap the left and right preamp connections at the amp. If the issue stays with the left channel, the issue is with the amp. If the issue moves to the right channel, the issue is with the preamp cable or the HU's preamp output.
I purchased a DEH-P780MP and have the exact same sound. My suond however increases in pitch throughout the RPM range and is audible when operating the headunit on ACC. I have found this problem to being typical in Checy Sports cars since I can swap this head unit out from my camaro SS into my Mustang Saleen and the sound disappears. The same is true for a swap into my SUV. Never quite figured it out! I think the 12V line from the fusebox or from the battery itself doesn't have "clean" power.
most ram trucks came with a infinity system. the amps are in the front doors, mounted to the 6x9 speakers. and they power the tweeters in the columms, and also rear speakers if you have them. I had to replace the entire system.