In Stock. 45 Day Lowest Price - 100% Satisfaction Guarantee. The AS312 is a 12" 3-way acoustic suspension loudspeaker system. It uses a 12" long-throw woofer with a butyl rubber surround, a 41/4" high-compliance cone midrange with its own subenclosure, and a 1" compression driver mated to a 60o x 40o horn. The AS312s are sold separately. Price is for each speaker.