Like thread says looking for 2 -10;s dual 4 or 1 12 dual 2 sq woofers. Brands like idmax, Flatlines, or Oz Audio are obvious choices pm me with what you have.
If you want a 15" I have one that will put all above to shame in SQ.The rest are a funky pup in compare.I also have a DD9912 that is known for SPL but I never ran in SPL and used them in my SQ systems that I swapped out PG cyclone for.If you know what you are doing they can sound better then most SQ subs
You will not ever hear of it I made it from the ground up with the help of TCsounds on the motor and RE did the coil and custom Kevlar lined cone and and full kevlar dustcap as well as REs surround and spiders added.Only one ever made they can`t make another like it without my say so.With the cost of it not many would want too make another.2 where made but one went for scrap after testing and T/S was done on it as it was more of a prototype to make the finished product.