Jordan31

Hi, new here, since pioneer apparently doesnt email back to people asking for help... and sorry if this is in the wrong topic...

Me and my bro have a problem with our system, sounds good and all but, you can hear quiet "hits" thru the subwoofers when you turn the stereo on and switch songs etc. (whether the car is on or just on acc)

We sit in the car for lunch at work, and we've noticed that every noise the cd player makes, like spinning, loading thinking, etc... you can hear it as quick but quiet bass "hits" through the subwoofers, even when songs are playing.

-----different noise------

and as of a couple days ago, we've noticed the power mirrors make noise through the speakers, not subs (at least, i dont think through the subs)

the system sounds great otherwise

We're not sure what the cause of this is, we think it might be the cd player
(cd player ground or something, ive read of a microfuse that goes bad in pioneer cd players)

-pioneer deh 4800 mp grounded through stock ground wire connection
-alpine type s 5.25 front 5x7 rear - not amplified
-2 mtx xthunder 12" 750w max subs
-mtx xthunder 1500w max amplifier for subs

any help would be nice , and if this is not a good enough of description, i'll try to give u more information or get a video for a better idea of the problem.

thanks

-jordan

JohnVroom

This sounds like the RCA is either faulty or needs to be grounded. Both are easy to fix, one is fairly inexpensive and the other is free.

1-Do a wiggly jiggly on the RCA right where it connects to the RCA plugs (HU and amplifier ens) if the signal is affected by lightly jiggling the wire or if the sound happens when you hit the gas or brakes than the RCA is faulty ... replace it or re-solder it (I have only had this problem when I make my own RCA's, never with store bought)

2- The HU signal may have lost its ground, simply connect the RCA shield (the outer electrode of the RCA jack) to ground (this is also referred to as the Pioneer HU fix by many Pioneer owners) this is my guess (and I have had this problem on embarrassingly expensive systems that are not made by Pioneer)

Jordan31

I hope problem #1 is as easy as a bad or loose rca, hope its not my amp

We dont hear these noises going over bumps or anything, its just any mechanical noise the cd player makes (reading, spinning, loading, etc.) we hear through the subwoofers.
I might try using a friends cd player to see if its the cd player at fault.

Problem 2, you said ground through the rca's, but ive read this ends up grounding through the speakers, shortening the life of them?
So could grounding to the chassis help?

thanks for the help and any more ideas would be helpful

MajorChipHazard

Pioneer headunits have a 'fuse' on the main ground circuit of the pc board.They are extremely sensitive to spikes(like when the RCA's are being plugged in with the radio turned out).It causes the earth to go open circuit and you then pick up all sorts of noise.Get the unit to a technician and get him to bypass that lil fuse and you wont have the problem again

JohnVroom

status?

Jordan31

i've read about this "micro fuse" but it doesnt sound like the problem i am or was* having. i didn't hear a lot of noise just quiet bass "hits" between songs

------------------------------------------------

Status? :

well, the cd player noise through the subs has stopped, for now at least, but all i did was slide the cd player out and jiggled around the wires. So maybe it was loose rca's or something.

but the noise through the speakers when i use the power mirrors is still there, we just got 15 more cm of snow, so I havent done anything about it yet.
I dont want to ground through the rca's because apparently it decreases the life of the speakers. so im just gathering any info i can get.

Ive also been emailing pioneer back and forth, so maybe they can tell me something.

JohnVroom

f-yeah it is
who telling you that?? balderdash! Not having the ground there can damage stuff. The RCA shield ground should be there, you are just returning the system to spec by doing this... majorcliphazard is saying the same thing BUT he evidently knows where the Pioneer is loosing the RCA shield ground!

anyway it now sounds like an impressed noise issue rather than what we had before if it is ONLY from the mirrors, some stuff from www.peripheralelectronics.com/sitemap.asp may do the trick

Jordan31

i dont know if grounding the deck to the rca's is actually bad, but ive read this on multiple forums, and i'd rather ground through the chassis first to see if that helps. I have also read about something that wraps around the speaker wires to keep interference out.

and also i'd just rather have everything wired the right way, instead of having a wire twisted around the rcas and screwed to the back fo the cd player

thanks for the help