Kaleb

Thank you I've realized this and I got confused by the Millie volts reading thinking it was volts . I've been trying everything to diagnose my main problem and I thought I had a lead. My main issue is when I disconnect all my rcas going from lc7 to amp, I can play music and still faintly hear it coming through my speakers, I'm pretty good but I'm no profession and I've never seen this before I have no idea what could cause it. Has annoying else ever experienced this ? It just seems impossible for the sgnal to travel with the rcas disconnected. It's like the signal is traveling through air just enough so when you put your ear to the speaker you can hear it as long as the volume is up all the way

I have a bmw with the base stereo. Ive added a lc7 along with a 5 channel alpine amplifier. I have a lot of static with my volume down and my engine off, I've even tried upgrading to a DSP and if anything it makes my static or humming worse. After doing some testing i have found a problem. While playing a test tone i checked my signal voltage for all the wires on the lc7 coming from the head unit. As i understand signal voltage should be in the 5v-10v range. 3 of my signal wires read 6-7 volts and one signal wires reads 40+ volts. I know how to check signal voltage all i do is put multimeter in DC and test positive and negative speaker wires coming from head unit. Any idea why one signal wire would have so much coming through it?