BTW, I believe the sensitivity of the Thiel CS 2.4's is 88 dB 2.83V/M, not 98 dB, and that's at a rated 4 Ohm nominal 3 Ohm minimum rating.
http://www.stereophile.com/content/thiel-cs24-loudspeaker-measurements
The Thiel CS 2.3's are slightly more sensitive, but also have a slightly lower minimum impedance.
http://www.stereophile.com/content/thiel-cs23-loudspeaker-measurements
IMHO, both require similar amplification. Of course room and individual volume levels required will need to be considered.
http://www.stereophile.com/content/thiel-cs24-loudspeaker-measurements
The Thiel CS 2.3's are slightly more sensitive, but also have a slightly lower minimum impedance.
http://www.stereophile.com/content/thiel-cs23-loudspeaker-measurements
IMHO, both require similar amplification. Of course room and individual volume levels required will need to be considered.