The speakers you are messing with are in the wrong class. The 750 is a solid amp. If you do not want to spend alot the power acoustic mofo is a great sub for the price. If you want something that is mediium range look into diamond audio. The mojo memphis are great too. I am speaking from personal experience 13+ years. I have never liked JL. Call me crazy. W3, W6, W whatever never liked them. I always found something better and more durable. Is this the ZX750 by kicker?