I have 4 18's that I bottomed out with 3kW per sub, 12kW RMS total for the subs. I never even scortched a coil on them, just ripped the coils from the spiders from over excursion below tuning... tuned to 23Hz had a Jim Jones song that went subsonic with my EQ set to +9dB at 20Hz 25Hz and 32.5Hz :D
The 4 18's are Blueprint Audio 1803's, designed by Fi starter/owner, Ascendant Audio owner, RE starter, Blueprint Audio starter Scott Atwell. Scott/Fi will recone them anywhere from single soft spider to 5 stiff spiders for $100/ea, IIRC he said after 5 stiff pack it will cost a little more per spider. They have tripple 7.5" slugs, 1.25" thick top plate, .5" thick bottom plate, about 55-65lbs/each.
If you are willing to pay shipping, I will dig up the wooden crates I received them in and boxes...otherwise local pick up only. Sioux Falls South Dakota 57104
$200 per sub.
$800 all four for now, will negotiate later down the road if theyre not selling...I am in no hurry, I am still working on getting the van running again let alone installing another 350A alt.
voice coils not burnt, rather tripple joint ripped off
1/2" bottom plate
2.5" of slug
1.25" top plate
over 4" of motor
7.5" diameter slugs