Well, I've previously owned the SDA-1Bs and 1Cs and enjoyed them immensely. I no longer have either but just tonight came across a great deal (I hope) on a pair of SDA-SRS. One driver is out, however (midrange) and it will need to be replaced. I'm guessing they used the MW 6502 driver? Is this correct? And, to anyone's knowledge does Polk still carry these or am I better off picking up a pair used? Thanks in advance for any knowledgeable replies.