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bad amp ground?

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    #1

    bad amp ground?

    i know this has been brought up before, but idk if i have a bad amp ground. the reason i say this is because i have tried it with three amps: a kenwood pw-580(old school and makes the most noise), a jbl m2 amp(also old school and makes very little noise) and an interfire ib2400 amp(got it new and makes no noise). my wires i have the ground hooked up to the my left rear seatbelt bolt, the remote start and rca wires, i have them running
    on the passangers side and the power cable i have it running on the drivers side. i have currently some monster rca cables and i tried some fosgate cables to see if it would help. no difference. right now im leaning on a bad HU ground because although its the stock one(i think) when i bought the car, it had all of the cables ripped as if someone had stolen the stereo. the amps ive tried different locations but i just decided to put them on the amp box. any ideas? the sound goes away once i start driving but is very annoying when im parked if i use the kenwood amp. the other ones are passable. oh and i know its not the subs cuz ive also tried different subs.
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    #2
    Can you describe the noise?

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      #3
      If it's a pitch change when u give it gas u need a ground loop for ur RCA cables but if it cuts off when ur nockin loud then its ur ground ...but also think of the radio the radios are most often the problem...check your radio first..

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        #4
        its a pitch change when i give it gas. it doenst go away when its knokin loud but the music does drown it out. whats ground loop for the rcas?

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          #5
          Alternator whine. Do you have a pioneer HU?

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            #6
            Originally posted by sonikaccord View Post
            Alternator whine. Do you have a pioneer HU?
            i agree sounds like alti wine

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              #7
              yes i do have a pioneer HU. are they known to do this?

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                #8
                Yessir, I never had an issue with my AVH-P4100, but had a few friends with diff pioneer units that have had the whine.

                If you're not careful and install RCA's under power or hotswap the rca's on the pre-outs you blow a fuse I believe. I've seen some kind of grounding trick with copper wire used to fix it, and one of my buddies soldered an external fuse to fix his and make future problems easily curable.

                Not sure if theres a simple way to fix it properly or not

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                  #9
                  Yep. They are notorious for blowing pico fuses on the inside. They can be resoldered. The simple fix is to take bare copper wire and wrap it around the rca outs on the back of the hu and connect the end of the wire to the hu chassis.

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                    #10
                    Originally posted by sonikaccord View Post
                    Yep. They are notorious for blowing pico fuses on the inside. They can be resoldered. The simple fix is to take bare copper wire and wrap it around the rca outs on the back of the hu and connect the end of the wire to the hu chassis.
                    lmao i think every pioneer i had i did this, but its worth the sacrifice

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                      #11
                      it is worth the sacrifice. i love my HU. just so many options. but so far i completely changed the ground, and on the kenwood amp, which had the loudest noise by far, it is barely audible now so it tells me that it worked. i havent tried the other amps, but this amp is giving me problems, so ill take it as a bad amp too. i think for reasurance, imma install the ground loop like h-town said. i saw one on amazon for like 4 dollars but imma keep shoppin around to see if that sounds reasonable. thanx for all the help. now can any one tell me why on the kenwood amp, why one rca input doesnt seem to be working? i opened the amp and everything seems fine.

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                        #12
                        Probably a bad channel. Check your switches too cause my eclipse amp did that once and it turned out to be the mono(L) switch being on.

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                          #13
                          it only has high pass filter switch. which makes me believe its only for speakers. but what does confuse me is that is says 300wx2 or 600wx1 which makes me believe there is a bridge mode. its old so i cant find the specs on it. it sucks cuz at the beggining it powered my subs prety well.

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                            #14
                            Bridging is determined by how the sub is wired to the amp...it's no switch for it...unless your amp is REALLY old lol. Can you turn the highpass off?

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                              #15
                              it is VERY old lol. i have the highpass filter off. but since its a two channel amp, and i have two twelves, i want to have one per channel.

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