Speaker Upgrade Question

Hello All, I am new to this but find this forum awsome. I just bought a 2011 4x4 double cab and am doing a pretty extensive upgrade. I will post some detailed threads ASAP. (I am currently in Afghanistan and have been ordering stuff like a mad man, so far around $3500.) I need help with a stereo problem, I plan on keeping the factory head unit and am adding the following:

• JBL GTO-5EZ 5-channel system amplifier
• Polk Audio db5251 5-1/4" Component System (front)
• Polk Audio db 651s 6-1/2" Slim 2-way Speakers (rear)
• Polk Audio DXi104 SVC 10" 4-Ohm Component Subwoofer

The big question is on the amp there is an RCA input for the subwoofer, I do not think the factory stereo has an output, is there any way to get around this without having to replace the head unit? Thanks in advance to all! Cheers

 

Speaker level output or line output converter. If you wanna keep the stock HU and want the best sound possible I would suggest a factory sound processor it'll clean up the signal.