Can I ask - Making ones own speakers are they that good? I mean I am looking at spending $4k on a sub can one be made better then that? & the time it takes to know how they work???Do you have any wordworking skills? If so you may want to try your hand at building a sealed sub. That way you could make it the exact dimensions you want and it will be cheaper and perform better than other subs in your price range. I know this does not directly answer the question you are asking but it is a great option.