mobile

So I just received a refurbished Galaxy Tab 4 T-230NU in the mail yesterday. Already rooted it once I got it up and going and slapped the Acheron ROM 1.6.5 on it. Everything works perfectly fine. I plug in my Beats headphones and sounds awesome. However, I came from a Tab 2 after having it for 2 years and it is basically the radio of my car using Sungsonic's amazing sounding ROM. I hooked my Tab 4 up in my car, via through AUX cord, and everything sounds fine until I turn the volume up on the tablet past a certain point. Not even all that high really, a good distance from max and all I get is hissing and crackling noises until the music stops playing. When I turn it down back to the half way mark it sounds fine. The issue about this is even with my radio at max the music isn't really that loud. I have Viper and Audio FX going and I manage to increase the volume a little but not enough. My AUX cord is fine and I even tried the cord from my Beats and did the same thing. But as said, my headphones are fine hooked up to it and I can turn it up full blast and I'm good. But when it's in my car is the problem and this is a big deal to me as I rely on this for music in my car.

Can anyone tell me what the problem or solution is for this? I went from changing roms to trying different equalizers and got the same result. :(