i want to install my subwoofers with the stock head unit, but since the stock head unit doesnt have a subwoofer output how can i get a signal to the amp? can i splice it from the speakers? if so do i need a crossover?

 

Many subs have "speaker level" inputs which can be spliced directly into the speaker wires.

 

yes, I did mine and spliced it into the rear speakers.

 

If the amp powering your sub doesn't have high level (speaker wire inputs) then just use a high to low (RCA cable) converter which cost about $20. Most subs with integrated subs like SAS Bazooka tubes have high level inputs built in. You don't need a crossover.

 

thanks! i didnt notice the high level input on my amp