Do you need a new head unit to power subs so they hit hard or can you use a stock one. I have a 02 Ford SUV. I was wondering if I could use my stock head unit so I could keep my 6 CD changer. I always thought you needed a new head unit, but my friend runs his sub off a stock head unit and it sounds loud.
I hope you're not talking about actually powering a sub with a head unit, that's a no-no. A stock head unit can power a sub amplifier via an LOC, but typically an aftermarket unit will work better due to less noise and cleaner sound from the preouts, and added control of the sub via crossovers and level control.