Just to reiterate, SOMETHING is being turned off during those 30 seconds and that’s when it noise goes away. I just don’t know what.
High pitch ringing after amp install
Recently had a Rockford Fosgate amp installed for my door speakers. Problem is that the amp is picking up electrical interference from somewhere and relaying it to the full ranges in the dash. A constant high pitch ringing noise. If I disconnect the inputs to the amp, the noise goes away. So it’s the signal not the amp. I’ve had this happen before on a previous vehicle with the same amp. The noise would stop if I turned off the DRLs. This time it’s not the DRLs and I can’t find anything that turns off the noise.
HOWEVER the noise does turn off when the vehicle is turned off for about 30 seconds but with all the audio and infotainment still running. Ground loop isolators didn’t work, different RCAs didn’t work, moving wires around didn’t work. Any thoughts or solutions?
HOWEVER the noise does turn off when the vehicle is turned off for about 30 seconds but with all the audio and infotainment still running. Ground loop isolators didn’t work, different RCAs didn’t work, moving wires around didn’t work. Any thoughts or solutions?
1 - 16 of 16 Posts
Could it be a module that is going to sleep at around the 30 second interval that makes the noise stop? Maybe try pulling fuses for various systems to see if you can isolate the source?
Say I do that and find out it’s a system that cannot stay disconnected or the truck won’t run, thoughts for eliminating the noise?Could it be a module that is going to sleep at around the 30 second interval that makes the noise stop? Maybe try pulling fuses for various systems to see if you can isolate the source?
You can't eliminate the systems on the truck. But perhaps you can wire your amp to a different circuit that isn't a part of what is causing the noise?
i had a similar issue on an amp install a long time ago. i dont remember the exact issue, but i think we needed to re-ground the amp. i think it was for a reason like redsled mentioned above
The amp shouldn’t be hooked to anything but the battery, ground, rca, pos/neg to the sub, and the signal wire that turns it on and off. I’ve hooked up so many different styles of systems and I’ve never once had this particular problem. Even with using a line output converter. Sounds like something was done wrong during installation for this issue to arise.You can't eliminate the systems on the truck. But perhaps you can wire your amp to a different circuit that isn't a part of what is causing the noise?
I’ve had this issue before with this amp and I moved the ground directly to the battery, no change.i had a similar issue on an amp install a long time ago. i dont remember the exact issue, but i think we needed to re-ground the amp. i think it was for a reason like redsled mentioned above
I’ve had this same system in another vehicle of mine, both done at different shops. By chance they both could have made the same mistake?The amp shouldn’t be hooked to anything but the battery, ground, rca, pos/neg to the sub, and the signal wire that turns it on and off. I’ve hooked up so many different styles of systems and I’ve never once had this particular problem. Even with using a line output converter. Sounds like something was done wrong during installation for this issue to arise.
Forgot to mention, the amp gain is all the way up. I know I know… however it is the only way to achieve no input clipping from the factory signal. If I back off the gain the noise goes away but it’s not loud enough to really listen to with the windows down on the highway. 100+ rms watts of power with 90+ db speakers, that shouldn’t be a problem. So I guess the new question is why does the amp have to be turned up so high to get the level of volume it’s supposed to do at half-2/3rds of gain? Is the factory signal just that bad and nothing can be done?
What are your door speakers rated at each and what is your amp rated at per channel rms?Forgot to mention, the amp gain is all the way up. I know I know… however it is the only way to achieve no input clipping from the factory signal. If I back off the gain the noise goes away but it’s not loud enough to really listen to with the windows down on the highway. 100+ rms watts of power with 90+ db speakers, that shouldn’t be a problem. So I guess the new question is why does the amp have to be turned up so high to get the level of volume it’s supposed to do at half-2/3rds of gain? Is the factory signal just that bad and nothing can be done?
Also, is it just a couple of speakers that the noise is coming from? If so, it could be that those particular speakers are bad or going bad. Just an idea. Also does it only do this when you’re listening to the radio or does it make the noise when using Bluetooth or aux cable as well?
80 watts rms speakers, 100 watts rms per channel ampWhat are your door speakers rated at each and what is your amp rated at per channel rms?
Listening to anything on any source playing, paused and disconnected. All speakers but really only notice it from full rangesAlso, is it just a couple of speakers that the noise is coming from? If so, it could be that those particular speakers are bad or going bad. Just an idea. Also does it only do this when you’re listening to the radio or does it make the noise when using Bluetooth or aux cable as well?
Sounds like a wire interference or some kind of bad connection. If they used cheap wire and ran them too close to the power wire, that would cause it. Loose or bad connections on the amp or stereo could cause it. If the amp is up against bare metal, that could cause it. Could be cheap or bad rca cables. Long list of things could cause it tbh.
at what ohm rating. the wattage output will depend on the ohm rating of the speaker. also, i assume you have no speakers wired in series, right?80 watts rms speakers, 100 watts rms per channel amp
1 - 16 of 16 Posts
Chevy Silverado and GMC Sierra Forum
A forum community dedicated to Chevrolet Silverado and GMC Sierra pickup owners and enthusiasts. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more!
Full Forum Listing
Top Contributors this Month
View All
davester3500
279 Replies
nealinator
258 Replies
shakenfake
137 Replies
Recommended Communities
