Probably 64kbps, based only on the filesize being twice what the 32kbps Type 4 AA files are. (One of the books in my library is listed at 131 MB in Type 4, and 262 MB in Enhanced.) I too am avoiding installing the new manager for the time being, since I really don't want to lose the convenience of running new acquisitions through Goldwave to get files playable everywhere. But the Type 4 files are so poor ("CD Quality" my rear!) that anything would be an improvement, so suggestions for converting these AAX files to WAV/MP3 would be greatly appreciated.