Is there any advantage using a single full range driver rather than a two way speaker box? I have a pair of Bose 201 Series IV and it looks like a Fostex FE166E Full range speaker can replace the Bose woofer and just disconnect the Bose tweeter. It appears even the Bose box demensions and port size is compatiable with the Fostex full range.
Fostex specs:
http://www.madisound.com/catalog/product_info.php?products_id=270
Bose 201 Series IV demensions:
http://reviews.cnet.com/separate-speakers/bose-201-series-iv/1707-7869_7-30112148.html