Choosing the correct driver (raw speaker) is important. If you are replacing a speaker that doesn't work anymore you should try to get the exact replacement driver. Putting the wrong one could damage the power amp or simply not sound right. Each driver is rated at a specific ohms and wattage and the excursion (movement in/out) of the driver is related to the port size of the cabinet. If you have questions please call us to advise you, we have raw speaker for most applications.