Has anyone else noticed that you have to increase your gains to get the full power of your amps? I am running JL Audio HD750/1 & HD600/4 and it seems my trucks stock system is louder. Granted I am a noobie when it comes to audio and I am using my OEM 2010 Subaru Legacu hu. But with 1300 watts of power, I shouldn't need to Max out my volume button with one car window down. Any input or advice please.