Originally Posted by BeerParty
You cannot substitute another 6.5" driver in this horn. This horn is design specifically for the Anarchy driver, if you want to use a different driver you would need to redesign the horn from scratch.
Sorry, I disagree.
Horns are resonant devices - so the 'sound' of the horn tends to swamp the sound of the driver itself, particularly as the horn gets larger. Due to this, you can frequently swap one driver for another. For some anecdotal evidence of this, note that Bill Fitzmaurice has horn designs which work with half a dozen drivers, as does Art Welter. Tom Danley uses basically the same folding scheme for three different subs, and just varies the driver and the volume. (IE pathlength is virtually identical, and so is expansion rate.)
The big 'key' to getting one horn to work with multiple drivers is to vary the volume of the horn. For instance, if you have two drivers with similar fs and qts, but one has a larger SD, you're going to need larger horn volume for the one with larger SD.
But there's an incredibly easy way to increase the volume - just increase the depth.
That's exactly what I did to get the Insubnia to work with the Alpine SWR-824D. The Alpine has higher SD than the Anarchy, but it works well in the Insubnia as long as you increase the depth.