I have thought about trying some type of planer speaker and this looks interesting. What can you tell me about this speaker pair? All I know is they were built in 1980 and they are 4' x 6'. What type is it, how much power to drive properly, sound quality, best placement, known problems. I have a local guy wanting to sell a pair for $500. Says they are near perfect. I haven't seen or heard them yet and thought I would get your guys input. Anything you can tell me would help me decide if I should go take a look/listen.