http://www.soundsolutionsaudio.com/forum/index.php?showtopic=16538

Apparently something went wrong so 4 of the SPL 15's are up for someone to pick up. They will take 3k daily, $330 Each shipped Canadian.

I'm getting 4 myself and running 2 Autotek mm4000.1D's on them. I was going to wall off the mj 18's but from what i hear about the SPL 12's...the 15's should just be nuts. (due to more cone area)

Here are the T/S parameters for all those who are into that stuff.

Fs = 39.91 Hz
Re = 3.70 ohms[dc]
Qt = 0.35
Qes = 0.39
Qms = 3.90
Mms = 250.57 grams
Rms = 16.100405 kg/s
Cms = 0.000063 m/N
Vas = 50.79 liters
Sd= 754.77 cm^2
Bl = 24.398737 Tm
Lp(2.83V/1m) = 94.46 dB

Their have been several reviews of the SPL line vs DD and other spl subs with very good results.

Initial SPL 12 impressions