The Ten Commandments of Noise Prevention - MR2 Owners Club Message Board
 
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post #1 of 10 (permalink) Old February 27th, 2004, 22:14 Thread Starter
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The Ten Commandments of Noise Prevention

Great site about preventing noise in your system.

http://www.termpro.com/articles/noise.html

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post #2 of 10 (permalink) Old July 12th, 2005, 18:47
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okay...i understand about 5-10% of what that guy said...the rest sounds like it's in Spanish or the Chica clan....
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post #3 of 10 (permalink) Old July 12th, 2005, 22:14
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A better explanation-

1- Plan your system out THOROUGHLY before you start the install. Know how the wires are going to be routed, what they connect to, where the grounds will be.

2- Ground loops happen when the signal wire sees more than one ground. When that happens the signal ground travels through the two grounds points rather than through the signal wire, picking up noise in the process. The only chassis ground for the signal is at the signal source (head unit).

3- Electromagnetic fields eminate in three dimensions. With power cables, this field gets larger as more current is pushed through. When you have signal cables running alongside the power cable, the signal cables are in the EM fields of the power cables, picking up noise via induction. Look up Ampere's and Faraday's law to undestand this better.

4- Shielded cables have shields that "pick up" any inductance, preventing them from affecting the signal wires.

5- The dash harness in the MR2 is a huge 40-50 lbs bundle of wires with only 3-5 ground points. The gauge of the ground wire in the radio harness is small (my guess is 18 ga), it is long, and it runs into a bundle of 100 or so wires. When you install a radio you use good quality wire and a predetermined ground rather than the factory harness' ground.

6- The signal ground in the signal cable and the ground on the head unit chassis must have zero resistance. On higher end signal cables, you will see an additional wire coming out of the RCA terminal ends, these are from the shield and are grounded to the radio chassis if the resistance is greater than zero.

7- This is straight forward. I like to keep amp grounds to 12 inches or less.

8- This applies to multiple amp setups. Although unlikely, it is possible to use "too much ground" when one amp is in use, leaving "not enough" ground for the other amps. The solution is simply running individual grounds for each amp. DO NOT use a distributor block for grounds.

9- When you set amp gain levels, you are doing so to ensure maximum signal goes through the signal cables, overcoming any noise that may exist. This is why high line level outputs (4-6V) are preferred with high end setups. In the MR2 this is less of an issue since most amps are frunk mounted and the signal cables are 6 ft long or less.

10- Filters are bandage fixes, they do not deal with the source of the problem. As stated a properly installed system will have no filters in the signal path.

HTH
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post #4 of 10 (permalink) Old August 8th, 2005, 14:41
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Good things to know. I'll go ground my radio right to the chassis now!
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post #5 of 10 (permalink) Old February 4th, 2007, 15:27
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not a bad write up
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post #6 of 10 (permalink) Old February 9th, 2007, 12:14
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I just recently installed a JVC 2-din DVD player in my MR2. Didn't have the whining sound till I installed this radio. I connected the ground wire to a bolt located on the passenger side. I also connected the DVD wire to it. Wanted to have control of the DVD player at all times. Could this be the problem.
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post #7 of 10 (permalink) Old January 6th, 2008, 20:54
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Quote:
Originally Posted by gixxer600
I just recently installed a JVC 2-din DVD player in my MR2. Didn't have the whining sound till I installed this radio. I connected the ground wire to a bolt located on the passenger side. I also connected the DVD wire to it. Wanted to have control of the DVD player at all times. Could this be the problem.
Hey Gixxer600...Did relocating the ground wire solve your noise problem?
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post #8 of 10 (permalink) Old April 24th, 2011, 07:35
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I have a great deal of respect for Wayne Harris but what he wrote about the 10 things make me laugh. A link to Auto Sound 2000 trouble shooting is the true way to have NO NOISE.
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post #9 of 10 (permalink) Old November 10th, 2013, 10:52
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I am going to have to disagree with using two grounds for two amps. It even goes against his own write up. The less grounding points you have, the less variables you have to worry about. That may be true for high wattage amps (2500 watts or so) but I don't see us putting 2 15s in our cars. He also left out the point that a ground to the frame and upgrading the ground from the batt to the frame is very important in High wattage systems. Most of the time running your power wire separate from your rcas is unnecessary IF YOUR RCAS AREN'T CRAP. Yes it can affect it again at higher wattage systems.
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post #10 of 10 (permalink) Old June 24th, 2016, 07:05
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Hey @red blues, just a shout out and thanks for putting out the TL;DR version for us! Thatís going to be a lot more helpful to some of the people that I need to talk to. I have this friend who insists he loves his car rattling all the way down the road. If only he knew how simple it's going to be to make a difference to all that clunking!
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