well I gather that Hales speaker company is not in around and so they are not servicing their products anymore. So this is why you are having a hard time with finding replacement drivers? If this is the story, I would start by looking and making calls to all shops and stores and try to find someone with the knowledge with Hales speaker's and go with their recomendation with finding replacement drviers. I know this can be a frustrating problem when it comes to finding parts. But they are out there just need to hit on the right source. The best with your hunt.
