Yes I know them !
When I was working at an audio retail shop, some 18 years ago, we sold a lot of them !
They were quite good middle-field monitors, the tweeters are protected by a simple lamp (electric bulb, yes!), and this old system is very accurate and needed, because, even if ferrofluided, those tweeters do not like a wrong use, over power and larsens…
Anyway, if you catch them a nice price, go !
…Huem, what's the price, in fact ?
Here is a picture for other lurkers, with a link for spares : Résultats Google Recherche d'images correspondant à http://www.reconingspeakers.com/wp-content/uploads/wpsc/product_images/21641_DSCN2552.JPG