I got my new 2-12" Type X's installed in a custom ported box built to specs today. I know ther are people that say there not loud there only SQ.etc,etc.... I modded my MTX 1501d today to add some ballz to the subs. To my ear, there sound great they hit hard with a nice rich deep sound. the low notes are tight and very accurate The back windows in my SUV were flexing. I am very impressed. I am not just saying this because I own them, Thats why I still kept my L7's in case I did'nt like them. When I do the amp upgrade I can only imagine. Thanks for all the advice you guys have given me the past few days, Any advice on what anp I should use for these bad boyz let me know. I'm thinking of Orion 2500d. Later.