This is a drop-in replacement for a failed SRM 350 driver. The part number on new stock is different to the old number and I confirmed this with Mackie. A replacement diaphragm is not available, so the only way is to replace the complete unit. This is a simple process; remove the screws form the amp module and disconnect the speaker and LED connectors. Then remove the three small countersunk screws from the under-tray and lift it to one side. The driver can then be removed (4 screws) and the new one fitted. The negative lead has a black stripe.
As this part is a genuine Mackie component it's guaranteed to fit and work as the original, so no problems with performance or quality. The only thing to make sure of beforehand is that the original unit really has stopped working - sometimes the connectors come loose.