Thanks, jeffree.
Part of the reason I'm asking is that I have done a search, but most of the info I have found concerns the older BX5 speakers, not the BX5a's. It seems there are some important differences between these speakers.
That said, someone must be using a sub with the newer BX5a's. Anyone have a recommendation?
Also, surely someone can quickly tell me how a sub attaches to these speakers without referring me to some vast technical article. Any help?