I installed 2 10 inch 300 watt RMS JL audio subs in a sealed box with a 1500 watt top strong gear amp in my GMC sierra. The subs are 4 ohm wired in parallel to a 2 ohm impedance. the amp is capable of 800 watts at 2 ohms but I have it set to 600. (34.64 Volts). my low pass filer is at 100 hertz. The problem is that my amp is clipping at 75% volume (this is the volume I set my gain at) unless I turn the high pass filter half way up and this is obviously taking away a substantial amount of frequencies and bass. I have been told many times with a sealed box I shouldnt need to even use a high pass filter( or subsonic filter). The clipping light on my amp is never solid but the lower I set the high pass filter the longer it stays on. Any info or input on what could be the problem with clipping would be greatly appreciated.