That amp does not have eq on paired channel basis .
Which means you can't set the eq between the floors
and doors to the proper levels .
The PDX series in the Alpine was mentioned here.
The is a bottom of the line amp.
https://www.crutchfield.com/p_136994...0aAhsvEALw_wcB
Also you can probably find this stuff cheaper elsewhere.
A quick search produced this
https://creativeaudio.net/jx400-4d-k...AaAjkvEALw_wcB