Audio Systems: Cracking/Crackling Sound From Speaker Before & After Splice, bose amplifiers, factory amps

Question
In an attempt to hook up another amp to run my high’s and mid’s I have encountered a problem. I spliced into the two front speaker wires coming out of the PAC (OS2). Now my Front Right works fine however my Front Left emits a cracking sound (only comes from the negative wire.) I have checked and the speaker is not blown.
The wires I connected are properly matched up. So then I disconnected everything and hooked it up to how it was before I spliced (Factory Spec). The cracking sound is still there.
So now I ran a jumper wire from where I spliced on the Left Front Negative (output of the PAC OS2) to the Left Front Negative output of my Head Unit (bypassing the PAC OS2) and the cracking sound stopped.
Now for the fun part – the volume was very loud – way louder than the right side. I could not turn the volume up a quarter of the way because it was way too loud. I removed the jumper wire and hooked everything back up to spec and the cracking is still there?

What is the cause/origin of this problem?
How would I go about fixing it?

I appreciate any help/comments/advice given.

Thanks!

I have a 2007 Silverado Classic with Bose factory speaker system except for a XOVISION Double DIN (PAC OS2 Module Connected) and Fosgate P6002 Amp running two Fosgate P3’s.
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Answer
that is one of the problems,' with that interface you need to disconnect the bose amplifiers. you need the PAC OS-2BOSE  because you are still using the factory amps,

now you never ,cut the wires  so most likely the amplifier got damage
because of the ground reference  unplug the battery to reset the system
this amplifier reports errors to the vehicle BCM and try it again
good luck