I am looking for a replacement mid woofer for my 12b RTA - MW6600X - cant seam to find any.

I have 12 of them...

Keep your eye on eBay they come up often. Even more rare are the mw6501 which in all intents and purposes is the same driver because if you look at the Polk schematics speakers that had the mw6600 drivers came with the mw6501 later in life with no difference in the crossover just a different mw driver number and or different tweeter. I have 6 of those as well. Good Luck

Hey Pitdogg, do you still have those 6600x that you would be willing to part with? 😊
I talked to Midwest Speaker and they claim the 6503 is the closest replacement but I've read more claims that it is indeed the 6501 🤔