How can you tell whether your system is "phase correct" ? First take off the grille cloth on your speaker. Next plug in an interconnect into your preamp's CD input. One will do. Turn the preamp on and place the volume control at about 1/4 volume. Now get TWO jumper wires and a 1 1/2 volt battery. Any type of battery will do > C, D, AA, AAA is fine. Tape one end of one wire on the outer shield of the interconnect and the other end of the same jumper wire to the flat negative side of your battery. Tape one end of the OTHER jumper wire to the center pin of your interconnect. Touch the other end of this wire to the POSITIVE side of the battery for about 1 second and note if your woofer moves IN or OUT. If the woofer moves OUT your system is phase correct. If it moves IN your system is phase reversed. If you can't see the woofer move, turn up the volume a little on your preamp until you can see it move.
If it turns out your system is "phase reversed" not to worry .... All you have to do is reverse the positive and negative wires on your speakers and you will now be phase correct.