if i had a set of akg or mbho's or gefell caps and wanted a active set up bad, i would take the caps to a local machine shop or even a high school vo-tech class. give them some pictures and ideas and have them draw something up. pass that along to jon naiant to see if its workable. he already said it shouldnt be a prob to power any of them. i cant see a slow machine shop or high school seniors project charging all that much. dont wait for anyone else, get out and check a place out. what the worse that can happen? they say no? big deal. move on to the next guy. step up! ed