Front speakers lower volume than rear

[avekaria]

I have aftermarket sound system XDM6820
4" Front Boss CH4230 Brand New ( Replaced defective aftermarket speakers)
Rear Stock speakers

The front speakers do not have enough volume compared to the rear ones.
I used FAD to send all sound to Front, but the sound is just not loud enough

I was thinking there is some wiring issue, should I try rewiring?
Help me diagnose
Thanks

[benzino]

you may have the wires in reverse polarity