Hi, I'm having a strange problem with my head unit, almost a month after installation I began to hear a very loud engine noise through the speakers. To begin I have it connected to a 4-channel Kicker kx-350.4 and four sets of Phoenix Gold 6.5" component system speakers.
Before buying the new head unit I had a Pioneer deh-p8200r and never had that kind of noise with identically the same setup. I checked all the grounds, from the head unit to the amplifier, battery, also installed inline 12V noise filters and nothing happened, I took the head unit out of the dash and turn it on to check if it was some kind of radiation inside the dash but nothing happened. I followed a noise-supression guide from Crutchfield.com but solved nothing, I connected mi iPod through the RCA cables to my amp and the noise was gone so it isn't my amp nor the rca cables. I decided to install the old head unit back into my car and with it there is not a little bit of noise so I concluded it's a problem with the head unit. One last important thing, the noise is even present I have the key on ACC.
I contated Pioneer and the gave me a list of local repair shops but when I call to one of them they told me they woudnt repair it because I dont have the receipt. So I will have to repair it on my own but I just wanted to know if this is a common problem, I've been making installations for almost 4 years and never had this kind of problem. I will appreciate any help you can give me.
Here we go again. i just had the same problem with my pioneer 1900mp. a little research found something out. with the pioneer units, they have a problem with the rca pre out jacks. they can burn out as soon as a little bit of electricity gets into them. of course i tried everything to diagnose the "engine" noise. but nothing worked, so i tried running speaker wires to the high inputs of my 4 channel amp, and the noise was gone. it's your pre outs, unfortunately. but fortunately for you, if it's still within the warranty period, they will probably work something out with you. pioneer customer service is wonderful. give it a shot.
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.
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Either that speaker is not connected or, the speaker is blown. To test: Disconnect that speaker from the stereo and, using a 9volt battery, tap the speaker's + and - to the battery's + and -. You should hear a "pop". That would indicate that the speaker works. DO NOT connect the 9 volt battery to the stereo side of the speaker wire!!!!
How did you install the head unit? Did you use a wire harness adapter or do it yourself? How are the connections made? It could be several things so more information is needed. Is the sound present with the volume off and coming from all speakers or just one? Does it get louder the more your turn the volume up?
Check your radio fuse. It is likely if you didn't disconnect your battery terminal that you may have blown a fuse.
About the speaker distortion, you may need to install filters to each speaker. They are not very expensive and can be found at just about any electronics store.
good day. well its a common head unit problem, have you tried to check on the noise filter of the head unit if it is properly connected. if its not then connect it for it maybe the reason your having the annoying noise. hope this helps. have a nice day
Well, I have the same problem and I would think it has something to do with the RCA-connections. If I power up my head unit while I have my main fuse for the amp's removed and then replace the fuse as the head unit is already playing music (thus putting out a current through the RCA-connections) it works just fine. But if I just power up my stereo with the fuse in, my subs go all crazy. I guess it has something to do with disruptions in the rca cable. Maybe they are drawn too close to some power cables or speaker cables?
It is not the deck that is a load of crap.... I install radios all the time and never had that problem.. You had some idiot work on your audio and he did something wrong. Now my first question is if you have an amp that was later added or put in at the same time. Allot of the time they wire the rca's and the speaker wires in utilizing the harness adapter. Duh,,,, right... Second, they made their own ground which consisted of them tapping into metal under the dash... now think about this that winding noise is probrably from the stereo being grounded to the same place as everything else in your car when they should have used a factory ground.. My suggestion is you paid for it... Make those **** fix what they did until they get it right if they keep fucking up start demanding free shit.... your time is being wasted on their fuck up take what ever you can from those assholes...
The humming is always there you just can hear it better when the cd is playing. The humming is caused by the electrical system in your car. There is an inline filter you can buy and insert it between the car's power source and the head unit. I had a head unit I bought that was absolutly terrible until I installed that filter.
Also if you did a do it yourself job on your amp wiring it is usually best practice to run your RCA cables on the opposite side of the car as your power cable.
You can also purchase shielded spark plug wires which is a source of noise usually of a different kind tho.
First make sure you have a good ground. This means that you have grounded your amp to bare metal not painted metal.
If that didn't work put in the inline filter on the head deck as they are only $20 available at radioshack.
If that doesn't work, go back an wire your car right this time and put the power and RCA on opposite sides of the car.
If you still have that hum it may be the spark plug wires but that sounds more like static than hum.
You have a text book case of alternator hum...
Switch the input wires from the sub to the speaker amp and vis versa. See if the problem switches to the other amp. If it does, you know you have a fault in the head unit. If it stays in the same amp, then you know you have a problem in the amp unit. Check with the manuufacturer online about how long the warranty is on each unit. Maybe they are still covered. Good Luck
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