Just installed the mb quart onyx 1.1500d. It replaced my 250 watt rms kenwood amp that was powering my 2 12 inch audioques. However they didnt get much louder at all. Like its barley noticeable. The amp puts out 1500 rms to 1 ohm and there wired down to 1 ohm. I mean 250 watts to 1500 watts should definatly make subs noticibly louder right?? Does this mean i need to upgrade the battery and alternator and all that? I drive a 2008 ford focus and yes i set the gains.