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Sep 28, 2016 3:36 PM in response to appleknowgowby griffd2004,I had the same problem but figured it out. First of all, it does take some time for the high quality voice to silently download in the background and become enabled. It can take hours. But for me, weeks went by and the low-quality voice remained. Here's why:
It has to do with your App Store System Preferences. I had all the checkboxes under "Automatically Check for updates" disabled, including "Install System Data Files and security updates". (This is to avoid any surprise bills when I'm tethering with my phone). Well, it turns out, when this is disabled, it won't download the voices from Apple's CDN (example URL: http://swcdn.apple.com/content/downloads/06/40/031-72924/0p9g9iuul9uaojp42eatzq4 b3zr38r4dgw/CustomVoice_en_GB_martha.pkg)
I haven't narrowed it down to this one checkbox (I enabled all of them) but I'm pretty sure it's the culprit. After enabling these checkboxes, I toggled Siri off and on a couple of times and watched the console - finally it downloaded and installed the voices and placed them in System/Library/Speech/Voices . You can keep an eye on System/Library/System/Library/Receipts to see when it actually installs the voices. Mystery solved (for me anyway).
Apple really needs to add a warning message or an override when you enable Siri if it's not going to be able to provide the high quality voice. It took hours of real digging to figure this out.