Replace Thiel CS3.5 Mid-Range with the Scanspeak 10F/8424G

stereo5, thanks for the response.  I've heard nothing but great things about PBN and especially Rob.  No reflection on them, I do like to hear independent voices on speakers as sound & hearing are subjective. 

twoleftears, go it.  It took awhile for the light bulb to go on in my head.  I have moved the question to that forum.  Have wonderful feedback from members.  A great group.   Perhaps we'll solve the world's problems.

Thanks again to both of you. 

I would ask the question in the dedicated Thiel thread. https://forum.audiogon.com/discussions/thiel-owners-2

If PBN says it is a good replacement then that is all I would need to know.  He makes very outstanding Speakers that always sound great.  I would order the driver with no reservations.  I would replace the one in each speaker so they are matched.