Love the review buddy! I have a set of SB-6000As (ported version of the SB-6000). I'm betting the sealed version would have tighter bass more to your liking. These are one of many vintage speakers I have but they definitely deserve a spot in my collection! Keep the videos coming!
Have and love both versions but my choice is my Technics sb- 6060 3-way, very rare with the same tweeter but a added staggered mid-driver, and sounds wonderful.