Popping noise from sub/amp with Alpine

[turn2dust]

I just installed my Alpine cda-9855, replacing the audiophile head unit in my 2006 f-150 I get this weird popping noise when i turn the head unit on when its connected to the harness i bought to maintain the sub from the system. What causes this and whats the chance or possibility that i could have blown something out? I hooked up the rca's to the sub output as directed, but was a little left in the dark on which wire needed to be connected since the harness had two amp turn on leads. I connected one to the remote on from the headunit and left the other unplugged. Any help/pointers would be appreciated

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[teknics]

There was another post from a while ago that says to install a resistor inline with the amp turn on lead. A resistor bascially delays the power from getting to the sub untill the audio signal gets there via the RCA's.

Radio Shack Part # 271 - 1120
(1.5k 1/2 Watt Resistor)


Amp turn on from harness Resistor Amp turn on from stock
------------------------- [//////////////////] ----------------------

Hope that helps.

[momalle1]

I had the same situation trying to connect an Audiophile HU to and aftermarket AMP and Sub. I haven't measured it, but though these forums it seems that the Audiophile and factory amp use 5 volts for remote turn on, and the aftermarket uses 12 volts. Using a resistor as noted, to drop the voltage should work.

[frostby]

Is your system completely noise free otherwise, howabout with the truck running, and the volume turned all the way down. If not, don't worry about a resistor

[nothinbutaford]

adding the resistor drops the voltage enough to quiet most of the pop dropping it much more won't allow the sub amp to turn on, it's way better than no resistor at all.

[teknics]

I actually got around to installing my Kenwood KVT915DVD and installed the resistor, but I still get a small pop.

It's not bad, but it's still an annoyance.

[RkyMtnFordFan]

I had exactly the same problem after new head unit install where I ran the head units black ground wire to the harness black ground wire. Use a ground screw on the body instead of using the ground on the harness. If you remove the plastic cover below the head unit/ash tray that covers the heater duct etc on the drive shaft tunnel you will find one or two screws painted green. Wire your ground there and pop should be gone. Mr Pop is not good for speakers so do this promptly. Also worth noting would be that in my case I was replacing an after market Alpine with a new Alpine. Good luck and hope this works for you to.

[F150 Duke]

Hey Guys,

I used to have two problems with my OEM sub on my 2005 F150:

1. Sub crackling during songs and even when unit is off. Kind of like a buzzing and such.

2. Loud thump on startup.

Per Ducati's suggestion I built the 5V reducer with a .1uf cap on one side and three .1uf caps on the other. This got rid of the sub thump.

Then I heard from a guy at CC that a bad ground is usually the problem of sub crackeling. But to test it and see if it's the sub, disconnect the red and whites and see if the sub crackles. I did this and didn't have any crackling for awhile. So I assumed my problem was that I had taped the red and white connectors together (side-by-side) to prevent ratteling and was thus getting interference on the grounds (outside gold parts of the connectors). So before taping them together to prevent ratteling, I went ahead and taped them separately to cover the gold ground area of the RCA connectors.

For a week I've been crackle and thump free. Now I'm getting a crackle from the sub again, however no thump. I'm frustrated as all heck and am about to give up completely on this dumb thing.

Can someone give me a suggestion or help...please.

Thanks again,

Duke

[F150 Duke]

Here is the diagram I drew to show you my wiring.

Duke