Hi,

I have I had constant engine noise in my car. I have a 4 channel amp, and whenever all 4 speakers are plugged in I get it. However when I have only 2 at a time there is none (doesn't matter which one). I have checked all the wires and separted. I have bought new wires to test and tried them no where near the power lines. I have tried it with 2 amps (which I am sure works since I bought it new). I have checked each speaker. I checked gains as well. One pair of speakers has crossovers (they are components). However front or back will work if I have just one pair on. The ground seems to be fine? Any ideas?? Could it be the ground of the head unit, its the original ground of the stock headunit? Any help is appreciated. Thanks!

Sam

 

I have the same problem. I am getting the whine out of the 2 tweeters...

 

Basically the culprit for most, if not all, problems like these are grounds. Not necessarily the amp ground, but sometimes. Not necessarily the HU ground, but sometimes and not always the battery ground or any other engine ground, but sometimes.

My advice? I say the easiest way to discount this (and to prob add HP to your car) is to reground every ground you can find with a wire twice as thick as the original. Also be sure to re-grind a nice patch of metal to attach the ground securely to.

When grounding your amplifier, be sure to use the same guage as your power wire and even thicker if you have it. The general rules of thumb still apply as well: 1. run RCA's down the opposite side of the car from the power wire. 2. Ensure all grounds are tight and not moving. 3. Try to ground everything to the chassis to avoid ground loops, in the event you are unsure and getting alternator whine, move the ground around a few times and see if your results differ depending on the location. 4. Try grounding external processors/crossovers to a different location than the amplifiers. This doesn't always work, but sometimes it does.

Also remember:
-Anyone that EVER tells you to get a noise gate doesn't know what they are talking about.
-Outboard crossovers\processors are notorious noise makers. Especially Audio Control. This is not because they suck, it's because they are delicate and need to be treated as such.
-Upgrading grounds can often help with dimming lights as well (usually has a more substantial effect than adding a cap)

Good luck.

 

if you had my problem, then the thick power wire running from your battery to your trunk is probably right next to a set of speaker wires....most likely u put the power wire on left, and one set of speaker wires on left, and the other speaker wires on right....that would explain y 2 speakers dont have distortion...because they are not next to the power wire