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Just finished these up this week. I started working on these the first week of December, but I got behind working on some projects for other people and then travel for work really made it impossible to get anything done in January. I'm not going to post a lot of details since these are going to be incredibly hard to duplicate given the North D25 has been unavailable for a number of years now and the D6.8 has also gone NLA recently. I got both items used here in the classifieds. However, if anyone wants more info, just let me know and I'll post it up.
Anyway, this is a basic 0.5 cubic ft box tuned to about around 40hz. Crossovers are 3rd order electrical on both drivers crossed around 1.7khz. The North tweeter is pretty impressive given its original retail price. Usable down below 2khz pretty easily. I had a peak toward the top end in both of mine but other than than most of the ripples are baffle diffraction related. The D6.8 has a funky little narrow breakup around 3.5khz and a bit of a natural rise around 1-2khz which gets more exaggerated with baffle step. This pretty much made a low crossover point on the woofer a necessity, so I'm glad the tweeter could handle it.
Here is what the final response looks like:
The bass on these is pretty freaking impressive for a bookshelf of this size. I'm also very impressed with these tweeters. Overall, I think he'll be pretty happy.
Now for naming them... I'm thinking the Double Ds
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