Chap in OZ selling empty 4435 cabinets, he has made new ones with 2405's in them ........ Personally I am astounded that they would need them, I get plenty of UHF out of mine but I suppose it might make the response graph look a bit better if nothing else. Here is a pick of his new ones with the 2405's (novel approach I thought) and a link to his ebay sale http://cgi.ebay.com.au/jbl-4435-stud...1%7C240%3A1318 just in case someone would like some empty cabs with nothing but the sound dampening material in them .