Gain issues

I don't think the antenna will make a difference and if it does, there are other problems.

If you try to play music from your phone to the head unit, does it play (including the sub) as it should?

I should have asked this earlier but why are you setting the gains with a test tone?
 
Did you mean cellphone to amp ? Bypass Hu. Well I was going to use a dmm but the cheap one my fluke and my Klein wont work so doing it by ear.
So I ran a ground from Hu to amp and put wire around input jacks to ground and hit them to read zero . Now my rcas from Hu wrere at zero but now .8. that part is bad RCA's depending if I move then around I'll get different reading have a new pair gonna put in tomorrow morning.
 
For some reason, I can't get my head around any of this thread... but I'll keep trying.

Aren't you using a cell phone to send a signal to a head unit that is ultimately driving all of the amplifiers?

Does the head unit with every source (except the bluetooth) work perfectly?

The input impedance of the shield is going to be relative high so 1 or 2 ohms won't make a difference.
 
Yes, it will play music, gain has to be pretty much off but then there's not much bass at all . If I turn up bass boost on Hu it doesn't sound good I hear it by me and especially way behind me it's almost like an echo. Tried turning box around changing frequency and slope and time delay . Got a ground isolatar haven't put in yet dont really think it will work . I rewired all the speakers and RCA jacks remote wire should be done tomorrow come to conclusion its the amp I don't have that problem with other amp .