get the 4000d. its a great amp. i have the hk 1998 and it does great for me. i have heard a few people badmouthing ma audio in here but i can promise you that you would be happy. what are you going to run off of the 4000d if you got it? i know someone that has four 1200xl's running off of one and it is insane.
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My 2003 FocusFlatty - i'll have you put back in rehab nucca!