Words don’t even do the matrix justice. Get this if you want to take your system to another level. This thing is no joke. I’d pay $500 for this thing.

I wasn't able to use my subwoofers with the line driver because when the input for the door speakers were in they would automatically put a signal in to the subwoofer which is ungodly loud at 153 decibals so I had to by pass the subwoofer channel on the device so I could use my bass knob, i had issue with ground noise even in ground isolation,i relocated the ground multiple times tried it on the battery the amp and the chasis and still had ground noise i ended having to lower the signal on the driver to 2 volts instead of 5 which I was trying to do to take a load off of my amplifiers, and then I played with the gain on the amp and got the ground noise very very minimal you can only hear it if you put your ear right up next to the speaker in the doors and even then it's barely there, but this device did help and it even gave me a slightly richer sound quality once I got it set up, I wish I could have set it to a 5 volt signal with zero ground noise but all is well it did what it's supposed too