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class D audio amps are popular for sub woofers because that part of the audio spectrum isn't as audibly effected by high IMD as mid and high frequencies .




 if you're gonna get your ticket and "run near the full spectrum"


http://www.ameritron.com/Product.php?productid=AL-811H


will handle the drive of your 257hp and be ready when you are to expand your frequency horizons . you will need a key switch for am use though .