The following driver curves were measured on the North Creek Music Systems'
LAUD equipment with a calibrated microphone in an anechoic environment.

Note that North Creek Music ships all drivers as "soft matched" pairs or quads; that is, tested and matched to ± 1.5dB. Drivers are shipped with their frequency response curves.

Broken in, hand matched to ± 0.5dB "Perfect Pairs" are available for an additional $30 per pair, $70 per quad.

These curves look much better printed than on the screen. 

 18W/8545 average specs Qts = 0.35, Fs = 34.6 Hz, Vas = 31.5 liters.