Blownsmlblok

Yes I'm jumping +to - on the input of the lc7i with 100 ohm .5 watt resistors per audio control tech support. It took the squeal away when I turned up the control on the lc7i. I thought that took care of it but driving down the road I smelt speaker again so I shut off the stereo thinking it would take care of it but it got worse. So I pulled over and pulled the rca's out of the lc71 and the smell went away. At first I thought it was just the speaker getting hot so I turned it down a bit but the hot smell smelt more like a melting. I dunno man this is confusing me and I'm the kind of guy that has to figure it out now!!! I like to learn the hard way I guess. Smh

kustomkaraudio

The stock ford amps are class d and do not like to have the outputs unloaded. The newer Dodge stock amps will actually shut down with no load.


The stock amp has a widget in it called a " output filter " What this means is all the high frequency modulation is gone ( unfiltered ) so the stock amp can be spitting out about 5 volts at 150khz.


Most components can pass this, but tweeters are the biggest victim.


Some of this I'm regurgitating from a engineer friend of mine.


I would see about getting the stock Sony amp warrantied....

Blownsmlblok

Yeah I figured I'd have to take all the stereo crap out to do so. I figured ford would say that it's not covered under warranty because of the aftermarket biz bang! I figured maybe the right channel on the amp or hu is jacked up!!!

lambie327

Sorry to dig up a dead post, but I have this exact same issue. It squeals my tweeters, so I thought bad crossover. Decided to ditch components and grab some coaxials. Once installed the squealing came back and I started to notice a smell. I have yet to load the inputs of my LC6i (7i will be here Sunday). Were you able to get anywhere with this? I am 99% sure there is an issue with the way the factory HU is sending out the signal.

And before some keyboard warrior tries to tell me to "take it to someone", I have. It was professionally installed and all other installers I took it to shook their heads at SYNC and said it's beyond their knowledge. ALSO, I am a professional Live Sound Audio Engineer. I know audio and audio systems very well, but car audio is notoriously bassackwards from almost every audio standard out there.

HushCarAudio

Have you guys considered using forscan? Just throwing that out there so you can switch the outputs to low-level and connect them directly to your amps and us the amps crossovers so you won't blow your tweeters.

lambie327

Hmmm... Haven't thought of that. Not too familiar with forscan. Right now I have it going from the factory Sony amp out, tapping into those lines and running them to my LC7i then off to the aftermarket amps. Outputs of the amp go directly into 2 way crossovers then to the woofer and tweeter respectively.

lambie327

Dug around into FORscan but can't seem to find any information to point me in the right direction as to how to reprogram the ACM. Any input would be wonderful. I have removed the squeal in the tweeters, my issue now is the noise floor is so low that you can hear a hissing sound when the HU volume goes to 50%. I have the gains on the LC7i all the way down and the gain on my amp at 50% and still hear the hissing. I am surprised to not find this anywhere on the forums as I feel like this would be a common issue with this Sony Amp and any aftermarket builds.

Typically, in Pro Audio, that's an indication of horrid gain structure or a bad ground somewhere. I checked all my grounds, cleaned them just in case, and even relocated some to no avail. All of my live sound knowledge seems to not be translating to the noise floor issue here, so my next guess is your suggestion, that the signal is too hot coming out of the Sony Amp and it being ran through the LC7i and my amp, it's just introducing too much noise causing the hissing?

nineball

in the 2009-2014 subforum the forscan thread is a sticky at the top. it will tell you everything that has been figured out so far, far more than just changing the headunit outputs to low level.

HushCarAudio

It's either a bad ground but you've eliminated that option, bad signal - hence the forescan route, or bad LC7i or amp. I'm also wondering if you should pull the signal from the HU instead of the Sony amp. It's just a guess that the HU will be set to a low-level signal since the Sony amp would provide the power.

lambie327

Quote:
Originally Posted by nineball
in the 2009-2014 subforum the forscan thread is a sticky at the top. it will tell you everything that has been figured out so far, far more than just changing the headunit outputs to low level.

Thanks, already been there and got pages deep of people talking about boosting their A/C, a bunch of fog light junkies and people wanting to add things that they could have added at the dealership. Didn't find much on ACM or any configurations within ACM but I will check again.

Quote:
Originally Posted by HushCarAudio
It's either a bad ground but you've eliminated that option, bad signal - hence the forescan route, or bad LC7i or amp. I'm also wondering if you should pull the signal from the HU instead of the Sony amp. It's just a guess that the HU will be set to a low-level signal since the Sony amp would provide the power.


Yea, I bought the PAC AmpPRO AP4-FD11 Amplifier Replacement Interface as it plugs into the back of the HU directly. The reasoning I went from the out of the Sony Amp is I was told that's where the some functionality inside the Sony Amp that I need to keep intact if I wish to use those features. Hoping this little box can do that. However the Sony system has 8 outputs. 2 Tweeters (Front), 2 Mids (Front), 2 Full Range (Rear, although my Harley Davidson truck has tweeters built into the rear doors with no extra output) and 2 for the Dual Voice Coil stock sub.

It's so strange to me that no one has a solid thread for anything to do with this amp... considering it is in hundreds of thousands of trucks.