A 1500.1 is going to put out 1500 watts rms, where the 15 l7 is rated at 1000 rms. It would most likely blow the sub i would get either 2 l7 12s or 15s bc then it will be able to handle the power. 2 subs offer more cone surface so they would be louder than just one.
Unless you wire the sub at a higher impedance which would not put as much power to the sub maybe wire it to 4 or 8 ohms depending on the impedance of the subs themselves, cuz they are dual voice coils they are either 2 or 4 ohms
def do some research before you make an expensive mistake