I have been looking at these Tang Band as well.
Any thought on doing a passive line level BSC between pre and amp ala Sexy speaker?
Yes, I've been considering that approach as well. That makes a lot of sense in that it keeps the electronic voicing confined to the electronic amplification system. I also like the idea of having the BSC outside the enclosure whether it's between pre and amp or a 'conventional' BSC.
However, at the moment I've become enthusiastic with alternative/simpler approaches to voicing the speakers without circuitry. It fits my newly adopted audio philosophy of less circuitry is better than more.
Out of the box the W8-1772 have a rising top end. This is actually a good thing because it's easy to deal with. It's better to have too strong a high end than no high end. You can deal with a strong high end through various means.
These are very bright speakers on-axis with no BSC. I am amazed that simply listening to my speakers off axis solves the brightness iscue with no circuitry. The detail is amazing without being grating. I'm going to audition that approach for a few weeks.