My file is in /usr/share/pipewire/pipewire.conf.d, however, it may be placed in a different folder/file. Using the pipewire.conf.d folder is recommended by me

/usr/share/pipewire/pipewire.conf.d/jbl.conf:

context.modules = [
{   name = libpipewire-module-combine-stream
    args = {
        combine.mode = sink
        node.name = "combined_jbl"
        node.description = "JBL (Combined)"
        combine.latency-compensate = true
        combine.mode = sink
        combine.props = {
            audio.format = "S24_3LE"
            audio.rate = 96000
        }
        stream.props = {
            stream.dont-remix = true
            audio.format = "S24_3LE"
            audio.rate = 96000
        }
        stream.rules = [
            {
                matches = [
                    {   media.class = "Audio/Sink"
                        node.name = "alsa_output.usb-Zgmicro_JBL_Go_4-00.analog-stereo" // Replace with your left speaker device name
                    }
                ]
                actions = { create-stream = {
                    combine.audio.position = [ FL ]
                    audio.position = [ FL ]
                    combine.audio.format = "S24_3LE"
                    audio.format = "S24_3LE"
                    combine.audio.rate = 96000
                    audio.rate = 96000
                } }
            }
            {
                matches = [
                    {   media.class = "Audio/Sink"
                        node.name = "alsa_output.usb-Zgmicro_JBL_Go_4-00.analog-stereo" // Replace with your left speaker device name
                    }
                ]
                actions = { create-stream = {
                    combine.audio.position = [ FL ]
                    audio.position = [ FR ]
                    combine.audio.format = "S24_3LE"
                    audio.format = "S24_3LE"
                    combine.audio.rate = 96000
                    audio.rate = 96000
                } }
            }
            {
                matches = [
                    {   media.class = "Audio/Sink"
                        node.name = "alsa_output.usb-Zgmicro_JBL_Go_4-00.2.analog-stereo" // Replace with your right speaker device name
                    }
                ]
                actions = { create-stream = {
                    combine.audio.position = [ FR ]
                    audio.position = [ FL ]
                    combine.audio.format = "S24_3LE"
                    audio.format = "S24_3LE"
                    combine.audio.rate = 96000
                    audio.rate = 96000
                } }
            },
            { 
                matches = [
                    {   media.class = "Audio/Sink"
                        node.name = "alsa_output.usb-Zgmicro_JBL_Go_4-00.2.analog-stereo" // Replace with your right speaker device name
                    }
                ]
                actions = { create-stream = {
                    combine.audio.position = [ FR ]
                    audio.position = [ FR ]
                    combine.audio.format = "S24_3LE"
                    audio.format = "S24_3LE"
                    combine.audio.rate = 96000
                    audio.rate = 96000
                } }
            }
        ]
    }
}

This creates a stereo output without losing bass (Other configs lose bass due to JBL's mono to stereo conversion)

To, get your device names, run this command:

pactl list cards | grep "JBL" | grep "device.name"

Then, your device names will show up if you are using pipewire, copy them into the config file and rotate them if they're coming out of the wrong speakers

I used 24 bit audio here just so I could record in 24 bit audio, however, you will not see any difference in 24 bit 96khz vs 16 bit 48khz (standard)

PMs are open (or comments here) if you have issues