Cliffhanger CHS-W2

Does anyone have a manual for this or the CHS-2?  The Cliffhanger CHS-W2 bass module has dual binding posts, which, of course, is typically for bi-amping.  However, this is a bass module, with I think only a low-pass crossover.  Is the second pair of posts there to connect to a CHS-2 bookshelf speaker?