pulling my hair out

[hotpursuit]

so before any one says read the sticky ive read it.

first i'll start with my setup and my issue..

i started off with alpine cde 117 deck alpine v power 4 channel with type r components and 6x9 coaxials (ran my own wire to each speaker). and a v-power mono block with type -r 10" sub.

i then added two more type r 6.5 coaxials in my rear doors and a second v- power 4 channel (also ran my own wire to these new speakers) i bridged the first 4 channel to the second with insulated rca's now only those two rear door speakers get signal noise, the reast have no interfearance.

ive grounded each amp independantly grounded the deck to another closer ground with a larger gauge cable. and those didnt work.

so i did some messing around with it. i disconnected the rca's from the first amp to the next and no signal noise. i connected an rca from the deck to the second amp and it only made a slight noise only audible when right up to the speaker. i then ran the rca that bridged the two amps completely away from any power or ground cables and STILL makes an insanely loud squeel only start up or even in accesory. then squeel then becomes really high pitch but lower volume while listening to music. i am going nuts. i have never had a signal problem since my first stereo in my first car.

any help would be amazing. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

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[martiandancer31 10+ year member]

it sounds like maybe the 2nd amp has a bad ground which could be causing a ground loop relative to the first.

 

[Mitch86 5,000+ posts]

Try grounding the RCAs on the back of the HU, maybe? Basically wrapping bare copper wire around the rca inputs and grounding to the case of the HU. I've seen this done to eliminate noise issues. No idea if its relevant in your case though.

 

[Buck 5,000+ posts]

Make sure every ground is good. Bat, alt, anything to frame, radio, amps. Your alt is creating ac current which is what you are hearing. Check every ground.

 

[sacsking916 5,000+ posts]

where are your amps independently grounded too?

 

[keep_hope_alive Premium Member]

it sounds like maybe the 2nd amp has a bad ground which could be causing a ground loop relative to the first.

or the amp has an internal issue. if the noise is always and only associated with that amp, it could be the amp.

 

[kramer_212 10+ year member]

like a boss.

 

[hotpursuit]

the amps are grounded to the trunk floor all in seperate locations.

i pondered the thought that the amp has an issue it self. im gonna try it in my friends car tomorrow see if it creates noise with his system.

 

[Buck 5,000+ posts]

I seriously doubt that is the problem. Never seen an amp create noise. It's usually outside interference. See there is AC ripple too. Basically your alt is AC current kind of made into DC current to charge your batteries right? I think the majority of alts spin 2-3x faster than the engine rpm. So if you are at 3k rpm, your alt is spinning at 9k rpm. You might hear a 9000 hz tone through your speakers. Following?

 

---------- Post added at 10:41 PM ---------- Previous post was at 10:41 PM ----------

 

And this is just a theory, not necessarily fact, but it'll put things into perspective.

 

[truckramrod 10+ year member]

Ground the 2nd amp to the 1st amp location.

 

[Ronny 10+ year member]

For future reference, you NEVER ground multiple amplifiers and other audio equipment on separate portions along the frame. Obtain a grounding block, and ground everything to the same place.

 

[SirVyouup]

For future reference, you NEVER ground multiple amplifiers and other audio equipment on separate portions along the frame. Obtain a grounding block, and ground everything to the same place.

Do you know why Ronny? I have 2 amps each amp is grounded at two different seatbelt bolts. I am having major voltage drops. Could this be why?

 

[hotpursuit]

see thats were info gets confusing ive read other sources that say grounding multiple amps to one spot can cause a feed back especially if one amp like the mono block is drawing more power vs the 4 channel.

any one know were i can get a grounding block?

 

[Ronny 10+ year member]

You always ground to the same spot because different grounding points can easily hold, or develop a difference in potential. A difference in potential in lamens terms equates to a ground loop. I can go much further into this, but you get the point lol.

You are looking for something like this:

Xscorpion 4 / 8 Gauge Ground Terminal - Darvex.com

 

[Ronny 10+ year member]

Do you know why Ronny? I have 2 amps each amp is grounded at two different seatbelt bolts. I am having major voltage drops. Could this be why?

No, that in itself shouldn't cause major voltage drop. What's your electrical like? Cables? Big 3? Power? Etc?

 

[SirVyouup]

No, that in itself shouldn't cause major voltage drop. What's your electrical like? Cables? Big 3? Power? Etc?

Factory 80 amp alt. Big 3 1awg. Kinetik hc1800. 1awg lead with 250 amp fuse to distribution block with dual 100amp fuses. 2 4awg outs that lead to 2 stacked kenwood kac9105ds. Pushing 1800 watts rms at 2 ohms to a single Pioneer ts-w30002d4 1000 watt rms. Voltage dropping below 10.5 on hard bass notes and major light dimming. Both amps are grounded at 2 different seatbelt bolts. Also master amp runs hotter runs hotter than slave amp, well the fan on the master is almost always on where the slave fan rarley comes on.

 

[keep_hope_alive Premium Member]

I don't use seatbelt bolts. I use grounding blocks as well but I always drill a new hole in the thickest part of a floor and use a bolt to sanded bare metal.

 

[Buck 5,000+ posts]

I don't use seatbelt bolts. I use grounding blocks as well but I always drill a new hole in the thickest part of a floor and use a bolt to sanded bare metal.

Seat belt bolts work just fine. What you are essentially doing creating another seat belt bolt, just taking a lot of time doing it.

 

[keep_hope_alive Premium Member]

Seat belt bolts work just fine. What you are essentially doing creating another seat belt bolt, just taking a lot of time doing it.

"work fine" is relative. we always recommend sanding a grounding point. in a car - that results in rust. you are weakening a safety restraint system.

the ring terminals used are soft metals, they weaken the seatbelt bolt location, introducing some play. worsened when more than one ring terminal is used. we don't recommend leaving seat belt bolts loose either.

i NEVER modify safety restraint systems. i also never use suspension bolts for ground points for many of the same reasons.

electrically, the bolts rely on painted welds. if properly sanded the connection can be good, but who mounts amps next to seat belt bolts? usually, the use of them results in longer ground wires.

the only reason they are used is because it is easier. easier != good