I have a brand new Hifonics ZRX 1500.1D. Took my friend's amp out of his car because we wanted to test out the new amp. He has a 15 inch kicker i do not remember exactly wat it is. But anyway we hooked up the amp perfectly and the output was terrible. Fuses were good, turned on and everything. Did not go into protection. It was not hitting very hard at all. Took it out and hooked his jbl 750 watt monoblock back up and it pounded great. What is going on with this amp?