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Discussion Starter · #1 ·
I just recently replaced all of the factory speakers in my 2004 GMC Sierra Crew Cab with Infinity Kappa 6.5s. I also installed a Kenwood Kac-8405 720-Watt 4/3/2-Channel Amplifier to power the speakers. I have the power wire run down the driver side of the truck and the RCAs run down the passenger side. The power wire is 4 gauge and runs to a distribution block by the amp where it tapers down to an 8 gauge wire connected to the amp. I kept the factory head unit and used a PAC AOEMGM24 Add An Amp Interface to run the RCAs. The previous owner of the truck had an iSimple PXAMG Gateway installed to provide an iPod input. So, the iSimple unit and the PAC Add Amp interface are both plugged into the factory harness. Everything is working great and the sound overall is fantastic. But, I've noticed that when I turn the volume up to a moderate level and pause the music, I can hear a faint crackle out of all of the speakers. I've disconnected and reconnected all of the speaker wires and RCAs one by one to see if the noise stopped, but no luck. The ground wire is solid. I've narrowed it down and realized that the crackle seems to only be present when using the iPod input. I can't hear it on the radio or when playing a cd. So, I'm a little at a loss. Do you think that the iSimple unit has an issue? Would an inline noise filter help? Any suggestions anyone? I appreciate your thoughts...
 

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Is the Ipod charging when you connect it or/and are you using the 3mm audio plug?

See when you have the Ipod charging while listening to it's audio thats when you get bad noise (ground loops).

If you remove the Ipod completely does the noise go away? (meaning no ipod at all).


I remember doing a simple mod for a friend (trans am)....he wanted to use his cells MP3 without removing the factory HU, so I tapped into the CD audio signal. Used a switchable 3mm plug that way when you wanted to hear the cell phone all you had to do was insert a CD and plug the 3mm plug. Once you remove it the source switches back to CD automatically, pretty easy and simple if you know what your doing.
 

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Discussion Starter · #4 ·
Is the Ipod charging when you connect it or/and are you using the 3mm audio plug?

See when you have the Ipod charging while listening to it's audio thats when you get bad noise (ground loops).

If you remove the Ipod completely does the noise go away? (meaning no ipod at all).


I remember doing a simple mod for a friend (trans am)....he wanted to use his cells MP3 without removing the factory HU, so I tapped into the CD audio signal. Used a switchable 3mm plug that way when you wanted to hear the cell phone all you had to do was insert a CD and plug the 3mm plug. Once you remove it the source switches back to CD automatically, pretty easy and simple if you know what your doing.
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The iPhone is hooked up with a 30pin plug that is connected to the iSimple box. A picture of the cable is attached. This cable does not charge the iPhone.

If I unplug the iPhone, the noise does not go away.
Cable Electronic device Electronics accessory Technology Data transfer cable
 

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Discussion Starter · #5 ·
Could just be a bad kink in the iPod cable. I seem to go through 3-4 iPod cables a year....
I have inspected the cable and I don't see any kinks. I've ordered a new one just to make sure though so I guess I'll find out soon enough. Thanks.
 
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