I can't seem to find much information about them, only one of their drivers has ANY parameters avilable - N7R N7R :: DC Gold Audio ::
other that that, the only help you get is an estimated box size, and that it should be ported..
i finally went for the DC Gold N7R, the N7R being the one i liked the most, both from construction and also their vision for that model (to compete with the best fullrange drivers on the marked..)
I see there is not many reviews on these speakers, so it will be quite interesting to see how they sound.
i was thinking ported, and around 50 - 80 liters, any thoughts?
Maybe contact Dave Chaffey directly ? As an avowed long time DIY builder, he should be more than capable of discussing your application and making specific recommendation(s )for enclosures . A quickie summary on the website's general info tab indicates he was quite happy with a TL design - but that term can mean different things to different folks.