The best way to pack your woofers is to use a cardboard sleeve for each individual woofer. Place them in a strong box with plenty of packing so they don’t move around. Otherwise put them face to face, zip tie them or bolt them together and wrap in bubble wrap. With large or heavy woofers it is best to use separate boxes. You do NOT need a return authorization #. Please include your name, daytime phone number, return address and a note about the repair needed with your shipment. Most return shipments we will use UPS ground.