ok i think i can help. im not quite sure buy i will try. your 520x2 am that means only 260 watts are going out each channel if each speaker is connected to the amp sepretley they will hit hard but not as loud. you got less power coming out of the amp. even 100 watts diffrence will change the loudness of the subs alot! if this does not help please let me know i will try to explain better
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wes@strictly4racing.com )
