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hi,
if the headunits got rca output (check for phono sockets on the back of it) then run a rca lead between the headunit and youll need to invest in a amp (make sure its got a low pass filter on it), enable the low pass filter on the amp - youll want it set to about 85hz - and hook the subwoofer to the amp. this should do you, if your head unit doesnt have rca output then youll need either a high level -> low level converter or an amp with high level inputs. either way just hook into one of your speaker outputs (say front left) and run them to either the high level -> low level converter or the high level inputs on the amp (depending which way you do it). again make sure the amp has a low pass filter on it, and enable this and set it to 85hz. then hook the subwoofer up to the amp output, and your away! most head units wont have a subwoofer out because it takes a hell of a lot of power to drive a large subwoofer (in my car ive got a 900 watt peek amp just for the subwoofer) - my head unit was 4x 45w, so no where near enough power!
hope this helps,
matt.
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Website: www.carpcshop.com
Email: matt.brocklehurst@terrastudios.net
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