I just finished wiring in the high pass crossovers to my speakers. Sight member( Pelked1) was right. Sounds Awesome!! I used the 300HZ crossover. A package of two cost me under $11.00 at a stereo shop. Installation is Sooooo Easy anyone can do this!!! 10 to 15 minutes per door. Only tool needed is a pocket knife. Only parts needed is 4 very small wire nuts or crimp the wires if you perfer. Procedure> Disconnect the negative cable from the battery. You'll see a pop out service pannel just above the door pannels large speaker (((Only when the door is OPEN))) !!! Lightly pry the pannel off. You will then see two seperate wiring harness with connectors. The red and black wires wrapped with black braided sheathing can be seen running from the speaker to the harness plug disconnect. Squeeze the connector then pull apart. The speaker wires are long enough to pull through the removed pannel opening. Pick at the black braided sheathing until you can pull out about an inch loop of the black wire. Then cut the black wire into and strip back each end enough to wire in the crossover between the now cut speaker wire. I connected with crimp terminal ends. Crimp,wirenut or solder. Whatever turns you on. Would be a good idea to use good grade tape to fasten the crossover to the door pannel inside so not to rattle. Pop the service pannel back on,Connect the negetive battery cable,Reset the base and treble settings then JAM !!