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they control the bass frequency going in to the amp so basicly if you only have 2 preouts (front and rear)then even if you have your amp and head unit set too low frequency you will still get singing through the sub which you don't want so a bass cube cuts this out
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Thats what Low
Pass Filters are for, found on 99% of amps.
They are a line driver. Line Drivers process signal running through them to basically clean up the sound, lettting you manipulate it also to produce a better sound.
Matt
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http://www.zen8627.zen.co.uk/Matt/
54 bhp of pure Italian muscle