rca troubles, i think

ok so here is what i have:

1-18" fi fully loaded btl

2-ma audio hk4000d (only running one)

1-kinetik hc2400

all 1/0 guage

jensen in-dash

here is the problem:

bass cuts out at like 3/4 volume sometimes even half volume and wasnt even working until i put in male-to-male rca connectors and a little shorty rca cable going from amp to rca cable that runs to head unit

this system use to be in another truck with a different head unit and battery, worked golden! put in another truck having major problems...

ok first off before i got the kinetik i switched out new rca(ones that were in other truck when working golden), also bought completley other amp(second hk4000d) thought the amp wasnt gettin enough power, i heard those hk4000d are power hungry, so i bought the kinetik...still not working

so to sum it all up having rca signal problems what can it be? headunit? pinched cable? what is the problem?

if there is anything else that you all would need to know let me know

any help is greatly appreciated! thanks

i had to use rca connectors because i was just wanting to try to see if it was the rca cable connection to the amp that was not good so i used male to male connectors to connect a different rca cable to the amp to the rca cable that is running to the headunit and it worked so the original rca that is still in place which is connected to the headunit must not have a good connection to the inputs on the amp.

the voltage on the amp is over 12 volts...13.5 approx give or take .2

the amp gains where set correctly before when it was in the other truck. i left them the same but started to mess with them after i put it in the other truck and were having problems. so my gains could need a lil work BUT, when i turn the gain and boost all the way down and turn up the volume it STILL cuts out, same thing when i start to adjust the gain up.

2ohm load on amp, which it is stable at that