[TJB]

Anyone,
What does a crossover do?  And would my Thiel CS2.3 speakers benefit from using this one? 

[Jon L]

Bryston 10B are Active crossovers.  In order to use it with your Thiels, you would have to disconnect the Passive crossover inside and provide 3 separate channels of amplification per each speaker, one per driver.  You actually would need TWO Bryston 10B active crossovers for three-way speakers like yours.

Some basic info: 
https://www.clearvibrations.net/passive-vs-active-crossover-networks/

[TJB]

In this case, I will not be getting one.  Perhaps if I had some cheap speakers, I would have considered it. 

[hawkeye99]

I realize you're are inquiring about the STD but there is also a 10B-SUB for integrating subwoofers. Just a fyi in case you were unaware.