I know that both of these are good drivers. I also know that the Dayton being a SVC is probably a better start for me because I dont know what I am doing, or how I would go about parralell wiring for 4 ohms (using 250 watt plate). I want to make a 70% HT 30 % Music sub using either the Shiva, or the Titanic MK II. Can you substitute the Shiva driver with the MK II using Adires 85 L vented plans or would you need a different port length. By looking at WIN isd which I havent fully figured out it tells me I need a 3X13 inch port for an 85 liter cabinet. Is that correct? I would like to use Adires plans but since the MK II is on sale I was thinking about going with that one. Thanks for any help.