My opinion of the best sound through the Thiels would be the Nad as a preamp driving the DBX amp in stereo mode, set at the low impedance setting. Use the Thiels as a two channel audio system, and if you were to use the Thiels in a multi channel system as your fronts, get at least 1 powered sub. Give this some time, as other people will chime in, with their own opinions. Enjoy ! MrD.
I'd suggest trying the DBX in both impedance settings, but I suspect the CS 2's will work better with the higher impedance setting.:
While easy to drive, the CS2's can be quite sensitive to amplifier's sonic qualities. The ported bass can be a bit ripe and the top end needs to avoid anything too hot. A wonderful bargain in it's day, and reputed to be amongst Thiel's most reliable models. They are bit old and replacement parts might be dear.
Thanks all, for the responses!
I've been reading multiple sources of information about amplifier to speaker compatibility and while I have learned plenty, I'm still a bit unsure how to proceed with making the optimal connection between the DBX amplifier and the CS2's (only). It seems that even if the amp puts out much more power than is needed, I'll be fine as long as I'm not trying to entertain the neighbors down the street. I agree with unsound, with regard to being able shoot for optimal impedance settings (given the CS2 data) and avoiding a "too hot" situation. My first thought was to use the 2 channel BTL, but I have to admit that I'm not too comfortable with that connection ("too hot") and don't think the manual is clearly presenting the best option, given my level of experience. Would anyone be willing to give advice (with explanation) on how best to configure the channel mode and wire connection? I attached a link to the DBX manual below.