solder about 20cm of cable to the 4" speaker's positive and negative terminal and let it out by the backside

solder the 2 wires from the woofesr to the terminal's poles

apply sealing tape to the backside on the edges and screw it on the front part.

measure the resistance of the whole speaker with a multimeter, it should be over 6OHM, if not: open the speaker and check for soldering failures, if none are there, a speaker might be broken. if all is ok, proceed to the next step

put the speakers on an amplifier of +-30watts RMS / channel max (for example, i use a Scythe Kama bay AMP 2000 rated at 2x 10watts RMS)

if you have too much mid, or high, or want to expiriment, you can start by adjusting the crossover, a good starting point for a new speaker hobby. :)

else, enjoy your homemade speakers :D