My promedia rear speakers have tipped over a few too many times and need replaced.Would I be able to use the ultra 5.1 replacement speakers klipsch has in stock?I have the v.2 400 system.They dont have 4.1 replacements in stock and probably wont so I heard.Ebay sellers sell em but I want new ones and all the ones on ebay are used.What happened to the klipsch promedia line anyway???They produced great pc speaker systems...