i have a kicker zr1000 and L7 subs and when i tap on the box the sub goes in and out and i cant turn the amp up all the way or it makes the sub go in and out really fast i mean i cant even turn it even close to half way it fine when the amps all the way down the only way i can turn the amp all the way up is if i had my had on the amp and my hand is touching the metal on the car can some one plz help me
