Yea, I'm on a 24db slow right now. Seems like they can go down much lower than my 5000cs (110Hz on those). I've only just put them in, so some tweaking will be needed. Also, I still have to set up my tweeters in the position I end up feeling "good about them". I'm going to try some various locations and see what I think. Once I figure that out, I'll be better off.
For now I'm going to shoot for 70-80Hz. Hopefully with the 24db slope 70 will be attainable. If not, I'll try the 12db 80Hz setup your on right now. Still very impressed with these speakers for the price.
Also, what cut off are you using for your sub? Right now I'm running my sub frequency right up to the RSD's cut off. So in other words, if my RSD's are 80Hz 24db slope HP, my subs are 80Hz 24db slope LP. Any thoughts on that based on your experience with these? I'm running only the RSD tweeters, RSD drivers, and subs. No other speakers in the mix.
Also, tc, check out my thread. I made a thread for compiling data on what frequency range people are using for their component/midrange/midbass drivers. You should add your data to that. I think it will help people trying to decide a base line of frequency response for a given product or speaker size.