This is the PA system we used at the Grange Hamfest for years — no longer in use but working as it should. Bogen model C-100 amplifier (100w), 4 University horn speakers (40w/ea) and 2 metal auditorium speakers (30w/ea?). The amplifier is capable of delivering 4 or 8 ohm and 25v / 70v line system. The 70 volt line system is used where the speakers are mounted hundreds of feet apart. Each speaker has a 600 ohm to 8 ohm transformer mounted inside. The transformer primary has taps for various wattage. Will consider donating to a Christian church or Summer camp.