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New amp and sub install- does this sound correct?

94GT

Outer Banks
Member
First Name
Mat
Joined
Feb 27, 2026
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1
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Location
Ohio
Vehicle(s)
2021 Mustang GT, 2025 Bronco, 2021 EcoSport
Your Bronco Model
Outer Banks
Hi All,

So the last time I did anything car audio was probably back in 2001, and had swapped the head unit out for an aftermarket which gave me all the outputs I needed for the system, prior to that I had a 1995 Ford Ranger that I used to compete with (had almost $15K in audio equipment) and did the install entirely myself, because again it was a non-factory head unit. So fast forward 30 years and everything has changed, and I have not kept up with anything in that world, so now I am well behind on it.

Here is my plan for what I am installing, and want to keep this as simple as possible. For reference I have also already installed the JBL Soundbar in place of the rear speakers and updated them with Forscan.

Rockford Fosgate Punch P1 P1-2X12 Dual 12" Loaded Subwoofer Box
RS2-500X1 mono amp.

Wiring- 4 gauge from amp to battery with 80amp fuse.

This is where I have some questions:
The amp also has high level inputs from the speaker wires as well as remote turn on from signal, so it doesn't appear that I need a line out converter.

Now when looking at the ForScan outputs for the rear speakers, only the drivers side has the sub low pass enabled (that is a full range output), on the amp there are left/right speaker inputs, but since only the driver rear output from the head unit is actually sending the signal that that subs will use, is it ok to wire both left and right input on the amp to the same output, or just use one input on it? Alternatively is there a way in ForScan to give a full pass to both rear speakers?

Any and all input is welcome--thanks in advance!
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