mag 6.1 speakers playing at different volumes

Hi, 

As the title says, my six speakers seem to be playing a different volumes. Some play loud, some play very quiet. Is there a way for me to set them all or to individually adjust the volumes of each speaker? Or perhaps was there something wrong I did during installation? 

To give context, I have the 6.1 mag system set up across my backyard which runs about 50 ft across. With the connecting sub in the center of that 50 ft.