I bought a Boston acustics GT24, Boston told me it would get 600RMS at 14.4 volts and 500 at 12.4, its a class AB amp, thinking if i should get the GT28 which is more power, but like $300 more, i want this thing to sound good and pound, the rest of the car isn't very loud, the 6x9s might be ran off the deck or at 75 watts (4 ch amp) will the sub sound good, or does it need at least 750 RMS to sound right, its going to be in a cavalier