Hi Audiolabyrinth:
Sorry for the late response as I have not been watching thread for quite some time.
I have not had any experience with the Black vs. Beeswax but only the RED vs. Beeswax.
I sold the RED while I could as a result of the sonic attributes of the Beeswax. The new owner of the RED has had some success so all things differ as you know already. I guess after the RED with limited success I moved away from the Black but I still wanted something to compare.
I have the Beeswax installed in my VAC preamp. where the RED sounded thin in comparison. I have since tried a Audio Horizons fuse in the same position with great success. It certainly is directional also. The Beeswax might be marginally better in the preamp. but you will need to put at least 150 hours on it or more to allow it to fully develop. I have heard a couple say they experienced improvement of the Beeswax out to 300 hours. In my case, the Beeswax is the one to beat but there is no trial period as SR has 30 days and AH has a 15 day return. AM claims there is too much labor installing Beeswax into the fuse to allow returns and they have to drill a small hole in the end of the fuse and syringe in the Beeswax along with another electrical process.
The idea of all of these fuses is to reduce noise vibration in the signal path and it has become quite a game in how that is accomplished.
Again I have not tried the Black for comparison but may as time permits but the Beeswax is just so musical so I have figured why bother for now. SR will no doubt have something beating the Black in the near future anyway.
Since there are certainly some great options out there I took it upon myself to just experiment with one component that feeds the system and I have not regretted that move.
If you would like my experience with purchase options on the Beeswax to save some money just shoot me an email at gwalters@charterwest.com.