I am finally getting around to designing and building my first DIY sub using a Tempest I bought last year and the 500W Parts Express amp I bought off of Brian a couple of weeks ago (Thanks Brian). While I have played around some with lspcad, I still think I need some help from those of you that already have a Tempest. In my current system, I am running an older M&K sub (model V125) that is sealed. A very accurate and tight sounding sub. I'll use the new sub 70% home theater and 30% music. While I love the impact that a pure HT sub offers I still want very accurate and tight sound. Essentially I want very good low end extension but don't want to sacrifice musicality and accuracy to get there. With that being said, what box type/size do you recommend? I was thinking the ported, mid Q design that Adire used to have in their docs. What would be ideal tuning to accomplish my goals? Lastly, what designs have worked for you? Sorry to ask so many questions, just want to get it right the first time. Thanks in advance.