Check out the inputs for these old Kenwood speakers on ebay:
http://i1.ebayimg.com/02/i/03/b3/2d/1c_1_b.JPG
Pretty cool that they gave you options back then on lower-Fi speakers. You could "Tri-Amp" them!!
Though why you would need to separately amplify two paper cone tweeters is beyond me:
http://i18.ebayimg.com/03/i/03/b1/92/ed_1_b.JPG
http://cgi.ebay.com/ws/eBayISAPI.dll...764035646&rd=1