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02 honda subs playing with radio off


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te2day 
Member - Posts: 7
Member spacespace
Joined: April 24, 2005
Location: United States
Posted: June 27, 2009 at 10:57 AM / IP Logged  
Hi I was wondering if any other installers came across this problem I have. I have an 02 Honda Accord Coup, 6 disk factory radio. I installed a LOC rated at 60 watts, a two channel amp, and two 12" dvc subs. The LOC is connected to the rear speakers. My amp turn on lead is connected to the RED / white acces. wire behind the radio. The problem is when I turn the radio off the subs play a loud continuous bass note and I have to turn the radio back on to prevent damage to the subs. I just want to know what is causing this? I thought it might be a faulty LOC. Any thoughts?
icearrow6 
Copper - Posts: 497
Copper spacespace
Joined: February 02, 2009
Location: California, United States
Posted: June 27, 2009 at 12:08 PM / IP Logged  
The factory speakers share common ground with the factory stereo. when the factory stereo is off it creates a "ground loop" and feeds engine noise.
Solution is to change the factory radio...or isolate the speaker basket from the frame.
or use a ground loop isolator on the RCAs of the LOC.
te2day 
Member - Posts: 7
Member spacespace
Joined: April 24, 2005
Location: United States
Posted: June 27, 2009 at 1:46 PM / IP Logged  
Thanks, Ima go try that. But its not engine noise, the car does not have to be on, it is a very loud bass note that will continuously play until i either turn the radio on or turn the key in the off position killing the remote turn on lead to the amp.
i am an idiot 
Platinum - Posts: 13,693
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: June 27, 2009 at 3:24 PM / IP Logged  

Any time you apply an AC voltage to a speaker, the speaker moves.  in turn, any time a speaker moves, it produces an AC voltage,  The problem is your amp is not turning off when the radio turns off.  When you turn the radio off, this allows the speaker to move around freely, because the radio is not controlling the movement any more.  So any time you hit a bump, the cone of the speaker moves a bit, this produces a small voltage.  This small voltage is sent through the Line Out Converter,  This in turn makes the woofer move a bit.  This makes the rear speaker move even more and then the Line Out converter sends more signal to the amp and the woofer moves even more. 

Your problem can be cured by either installing a switch in line with the remote wire so you can turn the amp off when the radio is off.  Or you could move the line out conveter to behind the radio.  The voltage produced by the speaker when it moves is minimal.  The voltage drop of the extra wire seems to take care of the problem.  This is a very common problem with Honda vehices, the trunk area is so well sealed.  I have heard of the same problem with one Mitsubishi Eclipse.

te2day 
Member - Posts: 7
Member spacespace
Joined: April 24, 2005
Location: United States
Posted: June 28, 2009 at 1:29 PM / IP Logged  
ok thanks I am going to have to put a switch on it then, because the LOC is behind the radio, the car is coming back tommorrow morning, I will try to figure out something
i am an idiot 
Platinum - Posts: 13,693
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: June 28, 2009 at 1:51 PM / IP Logged  
Connect the LOC to the front speakers is another option.
te2day 
Member - Posts: 7
Member spacespace
Joined: April 24, 2005
Location: United States
Posted: June 28, 2009 at 1:58 PM / IP Logged  

Alright, I will thanks for the help, its been bothering me all weekend.

te2day 
Member - Posts: 7
Member spacespace
Joined: April 24, 2005
Location: United States
Posted: June 29, 2009 at 10:04 AM / IP Logged  
Problem solved, putting the LOC to the front speakers did the trick. thanks
i am an idiot 
Platinum - Posts: 13,693
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: June 29, 2009 at 4:29 PM / IP Logged  
You are welcome. 

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