Make your car into a traveling sound studio with jbl car speakers. Before you install the speakers, you will need to choose the correct speaker amplifier. For 2 or more speakers, choose from any of the 600-watt, 4 channel amplifiers. They contain powerful pre-amplifiers and can be connected to speakers, without using Y-adapters which can result in reduced power to the speakers.
Step 1: Choose a Subwoofer Amplifier
Your audio system's subwoofer will also need amplification to balance the highs and lows of your speakers' sound output. Subwoofer amplifiers are mono, so they will only provide 1 signal, not 2 as in a stereo amplifier. JBL's subwoofer amplifiers range in strength from 300 to 700 watts per channel, so choose a subwoofer amplifier that will complement your main speakers and amplifier rather than overpowering them.
Step 2: Select the Speaker Locations
For 4-channel sound, 2 speakers in the front of the vehicle inside the driver and passenger doors and 2 in the rear window deck are the best locations. Add more speakers above the side windows for true surround-sound effects, using up to 8 speakers.
Set the amps in the trunk under the rear window deck, and connect their output wires to all 4 speakers, according to the instructions provided by the manufacturer.
Step 3: Insert New Rear Speakers
Remove the speaker grill from the rear window deck, and lift out the old speakers. Detach them carefully from the audio system, because you will need to use those input and output jacks for the new speakers. Drop in the new speakers and connect them to the amplifiers in the trunk. Replace the rear window speaker grill over the speakers.
Step 4: Remove the Door Panels and Insulate the Doors
Use a specially-made door popper to lift off the door panels covering the front driver's and passenger doors. Cut the acoustic sound panels to fit in each door, spray the metal inside of the door with super adhesive glue and fit the panels in. Roll them flat with the roller. Cut and place an acoustic sound panel inside the trunk above the amplifiers as well, to reduce external sound transmission.
Step 5: Insert the Door Speakers
Cut the inner door panels to the size of the speaker grill. Fit the speaker frames to the door panels with super adhesive and hold in place. Attach the speaker wires to the audio system in the dashboard, carefully connecting negative leads to the negative terminals, and positive leads to the positives, at the back of the radio. Attach the amplifier wires to the speakers, splicing in additional wire if needed. Solder the wire connections and wrap them in electrical tape. Refit the door panels into the doors.