best way to hook up this car audio setup?

i recently purchased a set of speakers and amp for my car and i hooked it up but it's not hitting very hard. cananyone give me advice? here is all the info on what i have, and i know it's not a competition setup but it's what i can afford. thank you
Amplifier:

1200 Watts x 1 Channel Rated Power
PWM MOSFET Power Supply
THD: 0.02%
Frequency Response: 10 Hz - 40 kHz
Variable Crossover: High-Pass (75 Hz - 750 kHz), Low-Pass (50 - 150 Hz)
4-Way Protection Circuitry: Thermal, Short Circuit, DC Offset, and Overload
12" Subwoofers:

Peak Power Handling: 1200 watts
Oversized 40 oz. Double Stacked Strontium Magnet
Frequency Response: 24 Hz - 1 kHz
Efficiency: 87 dB
the speakers and amp are xxx.
 
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