I've read several threads now that touch upon these two speakers, along with many others. Many of the posts suggest that the China made Anniversary edition may be a little harsh on the high frequencies, and other posts suggest that with ample break in this is not an issue. Some posts suggest that the Heritage does not have as much of an issue with high frequency hardness and may be preferred, although more expensive. The spec sheet for these two variants of the G12H indicate that the Anniversary edition has a resonance frequency of 85HZ and the Heritage is 55HZ, with all other spec's very close if not identical. Has anyone done a head to head comparison of these two speakers? I have a DR. Z MAZ 18 1-12 Combo with the Anniversary, but I was wondering if the Heritage version might be an "upgrade" and what if any issues may arise from the difference in the resonant frequency. I don't have any real complaints about the Anniversary GH12-30, but sometimes you don't know how dirty a window is until you clean it, if you know what I mean. Any advice appreciated!