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Many similar posts for subwoofer install but this one unique with amp behind cargo area panel without any panel modifications required- waterproof 
. Finally finished the install of tailgate subwoofer by Stinger, TFXBB12 which included Audio Controls 12”SPC12S2 subwoofer, 400 watt RMS, 600 peak, 2 ohm impedance. Also the Jensen JA1B amplifier with DSP, with 470 watt RMS at 2 ohm impedance. To add the subwoofer you have to also add an amplifier. This is complicated because in a soft top Bronco everything is supposed to be waterproof. So that means either a waterproof amp or installation behind a solid panel. I opted for installation behind passenger side panel in the cargo area. I did not need to make any modifications to the panel. It was a tight fit but ended up pretty perfect. There are several M6 size mounting studs protruding up out of the wheel well, I was able to attach a 2x2” aluminum corner bracket to 2 of those studs using M6 nylon insert lock nuts. The amp mounted at each bottom corner to that bracket and then used a self drilling screw to secure the top left corner into the seat belt mechanism well. Also used a 3/4” long nylon spacer for the screw reach and finally a 1” tall rubber stopper is wedged under the amp for extra cushion and damping.
Power cord is red, 8 gage, run from the battery through the drivers firewall grommet down the drivers side and then across the cargo area wire chase up into the amp location. I decided to splice into the high level speaker inputs from the rear sound bar for audio signal. I made that connection in the rear passenger door threshold for easy access in case of a problem.
Finally, I learned that the REM remote on/off input was not needed if using high level speaker inputs (as opposed to low level, low voltage RCA inputs) because the JA1B has remote signal sensing built in. I was planning to use the Bronco prewired AUX6 switch for easy on/off subwoofer control from the cockpit- but that won’t work with this sensing technology.
. Finally finished the install of tailgate subwoofer by Stinger, TFXBB12 which included Audio Controls 12”SPC12S2 subwoofer, 400 watt RMS, 600 peak, 2 ohm impedance. Also the Jensen JA1B amplifier with DSP, with 470 watt RMS at 2 ohm impedance. To add the subwoofer you have to also add an amplifier. This is complicated because in a soft top Bronco everything is supposed to be waterproof. So that means either a waterproof amp or installation behind a solid panel. I opted for installation behind passenger side panel in the cargo area. I did not need to make any modifications to the panel. It was a tight fit but ended up pretty perfect. There are several M6 size mounting studs protruding up out of the wheel well, I was able to attach a 2x2” aluminum corner bracket to 2 of those studs using M6 nylon insert lock nuts. The amp mounted at each bottom corner to that bracket and then used a self drilling screw to secure the top left corner into the seat belt mechanism well. Also used a 3/4” long nylon spacer for the screw reach and finally a 1” tall rubber stopper is wedged under the amp for extra cushion and damping.Power cord is red, 8 gage, run from the battery through the drivers firewall grommet down the drivers side and then across the cargo area wire chase up into the amp location. I decided to splice into the high level speaker inputs from the rear sound bar for audio signal. I made that connection in the rear passenger door threshold for easy access in case of a problem.
Finally, I learned that the REM remote on/off input was not needed if using high level speaker inputs (as opposed to low level, low voltage RCA inputs) because the JA1B has remote signal sensing built in. I was planning to use the Bronco prewired AUX6 switch for easy on/off subwoofer control from the cockpit- but that won’t work with this sensing technology.
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