Just buy all three the sub box amp and wiring for 19136. The amp should be set up next to or on top of the subwoofer enclosure.

Diy C63 External Sub Amp Installation Mbworld Org Forums
Amp and sub installation. Use more crimp connectors or solder the wires together as needed. All installations have their own twists. I have shown this on my 1996 nissan skyline r33 gts t type m spec ii. Before you get started find a suitable place in your vehicle to mount your sub. Time to install the amplifier step 1 disconnect the battery. The subs built in amplifier generates heat so adequate ventilation is important.
Step 2 mount the amplifier. Your amp does not have a subwoofer lead. Subwoofer install covers putting sub in box thats it. Mount your amplifier in the location youve chosen. This is a video tutorial on how to install an amplifier and a subwoofer in your vehicle. Then connect the latter subs negative terminal to the amps negative terminal.
Step 3 install the power wire. Lets take a look at what it takes to install a powered subwoofer in your vehicle with the help of one of our guys from tech support. I dont know where he went but where i go to do installs he is no longer there. Rockford fosgate p300 12 punch 300 watt powered loaded 12 inch subwoofer enclosure. No matter what kind of music you love adding bass makes it sound better. Set the parking brake and disconnect the negative terminal from your battery to prevent.
Find a place to mount your sub. Use a crimp ring terminal and secure it to the car body bare metal with a factory screw or bolt. Vehicle subwoofer systems. Httpsgooglmfu0ty shop for amps. To wire in series simply connect the positive leads of the subwoofer to the amps positive terminal but then connect the negative terminal of one subwoofer to the positive terminal of the second sub. Httpsgooglstlle5 follow along with one of our experts as he installs an amp and sub in a vehicle.
The amp install is the main thing and it can be from 70 125 depending on type of amp. Connect the amplifier ground wire to bare metal near where the amplifier and subwoofer will be placed. If it is separate from the subwoofers it may have its own colored wires to connect to the ones on the stereo. Even if it did the factory subwoofer is utter crap. The power wire from your amp. Install and wire an amp if it isnt set up yet.