RSL Roger Sound Lab 4200 question

I have a pair of Roger Sound Lab 4200 tower speakers. Does anyone know anything about these speakers? I can't find any information on the web. I would like to sell them but have no idea what they might be worth.
You might try your search using RSL Speakers.
Thanks. I did find a little bit a number of years ago on another forum but that's about it. I'll keep looking.