Trunk Grounds - Audio & Electronics Forum

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Trunk Grounds
Saturday, April 01, 2006 10:15 AM
Im hooking up a cap on top of my sub box, so its basicly going to be right under that little back seat latch contraption. Someone told me that a ground wire shouldnt be more then like 18"s so where could I look to ground it near that area, I was just gana run it down to where the amp was grounded but that would mean running some 4 ft of wire.




Re: Trunk Grounds
Saturday, April 01, 2006 10:25 AM
Doesn't really matter. The same current runs through your power wire and it's longer than 18 inches. Just make sure the wire is as large as your power wire.
Re: Trunk Grounds
Saturday, April 01, 2006 10:41 AM
Actually your ground is not supposed to be longer than 3 feet (36 inches). And that should give you just about anywhere in your trunk.



QUOTE:"Doesn't really matter. The same current runs through your power wire and it's longer than 18 inches...."

The way your positive and negative run through the car is extremely different so thats not really relevant.

STREET ANTIX, it's coming...
Re: Trunk Grounds
Saturday, April 01, 2006 10:45 AM
Well it would be running down to right next to the seatbelt bolts, i think thats more then 3 ft.



Re: Trunk Grounds
Saturday, April 01, 2006 10:47 AM
The hole trunk has metal behind the carpeting. drill a hole toss in a screw and be done with it.



Re: Trunk Grounds
Saturday, April 01, 2006 10:58 AM
streetantixz24 wrote:

The way your positive and negative run through the car is extremely different so thats not really relevant.

That is a retarded statement. I don't think you know anything about electricity. Why don't you explain how it's different?
Re: Trunk Grounds
Saturday, April 01, 2006 12:14 PM
Sorry to post jack, but can you explain why the skin effect is an bad thing for audio systems?



Re: Trunk Grounds
Saturday, April 01, 2006 12:54 PM
Skin effect is where most of the current flows along the outer portion of a conductor causing the equivalent size of the conductor to be reduced. This is an effect seen on alternating current only and the higher the frequency the more pronounced the effect is. I wouldn't worry about it in car audio because the speakers that will be subjected to frequencies high enough for this to be a concern are the tweeters and to a much lesser extent the midrange. Unless you're running extremely small wiring to these speakers, you shouldn't have any problems.

The low frequencies fed to the subwoofers aren't affected by skin effect enough to cause any concern.

Power wiring to the amplifier carries direct current only so skin effect isn't applicable.


I've dealt with some 400Hz generating equipment where it had to be accounted for, but it didn't really affect the conductor ratings greatly.



Why ask this anyway?
Re: Trunk Grounds
Saturday, April 01, 2006 1:42 PM
just out of curosity, thanks.



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