hi, had some Focal 165VR splits and an amp installed and I'm finding the sound is not as loud as the OEM set up and not as punchy. I really need to turn up the sound on the head unit to get it to the level I usually have it on. Also noticed that if I fade the sound to the front so that only the focals are on the sound is shocking, and I basically need to have the rears on to improve the sound (aprox 60/40 split). Any ideas why this would be the case or what would be causing it? Cheers.