help needed for PREAMP

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Joined 2002
I Have SUBWOOFER 12' 450W R.M.S 900W MAX
12Hz - 1.5KHz and i connect the sub to DJ AMP and i want to build a High Power PREAMP in 12-1000Hz...... and high output .....
so were can i can get or build preamp like that........??
pic :
 

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