Looks like the s8s are pretty darn accurate.
S8's Response
+1.92/1.44 dB from 200 Hz to 10 kHz
http://www.hometheatermag.com/floorloudspeakers/1004paradigm/index2.html
B&W 803D Response
+1.90/3.68 dB from 200 Hz to 10 kHz
http://www.hometheatermag.com/floorloudspeakers/1005bw/index2.html
Revel F52 Response
1.44/2.37 dB from 200 Hz to 10 kHz
http://www.hometheatermag.com/floorloudspeakers/506revel/index2.html
S8's Response
+1.92/1.44 dB from 200 Hz to 10 kHz
http://www.hometheatermag.com/floorloudspeakers/1004paradigm/index2.html
B&W 803D Response
+1.90/3.68 dB from 200 Hz to 10 kHz
http://www.hometheatermag.com/floorloudspeakers/1005bw/index2.html
Revel F52 Response
1.44/2.37 dB from 200 Hz to 10 kHz
http://www.hometheatermag.com/floorloudspeakers/506revel/index2.html