Alright guys, i just installed my 2 amps, (2 channel bridged mono for my sub, and 4 channel for my 4 speakers)
I ran 2 seperate power wires, 8-gauge for 4 channel, 4 guage for 2 channel amp) My 2 channel sub amp is fine.
Now my problem is with my 4 channel amp. I have settings on my amp that allow me to change the levels of the front speakers and back speakers like making the voice or words of the songs louder. When my engine is off, im just playin music everything sounds fine. But when i turn my engine on, a humming sound comes from the speakers. If i turn the settings up on the amp the humming sound gets louder, but if i turn the main volume up on my hu nothing changes. If i make it low enough on my amp so u cant hear the humming sound, its so low that you cant hear the words.
Please guys.. somebody help me, i have no clue what to do, or what it is.
I ran 2 seperate power wires, 8-gauge for 4 channel, 4 guage for 2 channel amp) My 2 channel sub amp is fine.
Now my problem is with my 4 channel amp. I have settings on my amp that allow me to change the levels of the front speakers and back speakers like making the voice or words of the songs louder. When my engine is off, im just playin music everything sounds fine. But when i turn my engine on, a humming sound comes from the speakers. If i turn the settings up on the amp the humming sound gets louder, but if i turn the main volume up on my hu nothing changes. If i make it low enough on my amp so u cant hear the humming sound, its so low that you cant hear the words.
Please guys.. somebody help me, i have no clue what to do, or what it is.
You ran separate power wires which is good. What does the grounding look like? Do you have a special ignition system in the car that produces a lot of noise?
off-chance: have you only tested in one (car park, garage etc.)location? does the noise go away somewhere else.
off-chance: have you only tested in one (car park, garage etc.)location? does the noise go away somewhere else.
Try cleaning up the ground for the 4ch, move to another location if necessary, and make sure to grind away all of the paint in the location that you choose.
well.. if i ground the 4 channel amp in a different spot, doesnt that mean i have to change the location of ground for the other amp and cap?
Also, is it bad to have the 2 amps and cap all grounded in the same location?
Also, the noise doesnt go away, if the engines not on, it doesnt do it, but when the engines on, it does. It seems like it gets louder when i accelerate.
Also, is it bad to have the 2 amps and cap all grounded in the same location?
Also, the noise doesnt go away, if the engines not on, it doesnt do it, but when the engines on, it does. It seems like it gets louder when i accelerate.
grounding...
ultimately "star " grounding is the best. That is, all grounds are at the same location. There always exists a potential difference if different ground points are used. Obviously, running seperate power lines, etc, as others have pointed out is good practice. Also please use an adequate sized fuse within 12" or so of your battery--If a short occurs it'll kill the lead there , instead of somewhere else, reducing or stopping "that burning smell" from the whole car.
ultimately "star " grounding is the best. That is, all grounds are at the same location. There always exists a potential difference if different ground points are used. Obviously, running seperate power lines, etc, as others have pointed out is good practice. Also please use an adequate sized fuse within 12" or so of your battery--If a short occurs it'll kill the lead there , instead of somewhere else, reducing or stopping "that burning smell" from the whole car.
npcout said:
No, you can have separate grounds if you want. Normally it's a good idea to use a common ground, but some vehicles have noise issues with a common ground and you get a better result when you split them up, my car is this way. Just try it out and see what happens.
With the system off, unplug the RCAs from the amp and measure the resistance from the shield (outer metallic ring) to ground. It should be near zero ohms. If you read more than 10 ohms, you likely have an open shield ground in the head unit. If the head unit is easy to remove, unplug the RCAs from it and measure the resistance between the RCA output shield to the case of the head unit. It should be ~0 ohms.
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