I hope this thread's not too old to bump a little bit!
Anyways, I recently picked up a pair of RSL 4200Bs for 40 bucks at a thrift store. I don't know anything about them except that they're three way with ribbon tweets. Haven't found any info online either so I emailed the current RSL people about them. Will have to wait and see what I can get from them...For what it's worth, they don't sound that bad actually. Not on the level of my Infinity RS-4bs (which are pretty much the exact same size so there's no discrepancy there), but for 40 bucks, they're good enough to keep. Has anyone got any info about these??? It would be much appreciated!