Double stack Linkwitz Phoenix subs. Home made. Four 12" XLS 830500 Peerless drivers per side in dipole config.
Sell $595 The list on the 8 Peerless drivers alone was nearly $2,000 Local NC Triangle pickup only. No boxes. Will consider selling & shipping drivers alone.
see pics and discussion here: http://cgim.audiogon.com/i/vs/i/f/1131726200.jpg http://linkwitzlab.com/woofer3.htm http://linkwitzlab.com/woofer.htm http://www.wescomponents.com/datasheets/Speakers/Peerless/830500.pdf
I haven't used these in 10+ years (due to WAF). Great sounding subs.