I have 2 working Danley dts-10 subs built from kits. Both are in working order and do a great job of cracking plaster. I can ship via freight if need be but would prefer local pick up, they are each over 300lbs. There are some cosmetic dings from moving but nothing that paint cannot fix, they are not stained/painted. I can supply pics if interested.
It's $600 each I'm sure -- but even at $600 each it's a stellar price. The DIY kits are double that before shipping. I've been considering them myself to make a platform under my recliners --- like the worlds greatest tactile transducers -- unfortunately my ceilings are a little low for this setup -- even if it's only about 15"