The goal of this system is high sensitivity coupled with very high output and power handling and extension with full power output to 30Hz from a cabinet form factor of 24x36x36". Intended use is for sound reinforcement requiring loud output levels over the range of 30-100Hz in very large spaces, outdoors, clubs and other venues. A tapped horn design was settled on with a low corner of 27Hz and developed for its combination of high sensitivity and good driver excursion control in the cabinet form decided upon. The cabinet itself is constructed of 18 and 12ply void free baltic birch (but i have change all the birch to 18mm). The basic cabinet design allows for handle, caster and input jack placement as well as allowing for a plate amplifier cutout if needed. Additionally quite a few other drivers which would be suitable in the Othorn cabinet design were identified as well, though the cabinet requires a driver having a lot of displacement coupled with a very strong motor and this naturally results in most of the drivers being fairly expensive. An adapter plate has also been built and designed to allow for switching between 18 and 21" drivers. Testing with other drivers will be done in the future. Testing the Othorn outdoors show that the months spent developing and tediously simulating the system have paid off well with most of the data matching the simulations rather well. Sensitivity is high and maximum output is prodigious to say the least. very strong output is maintained to 25Hz. Most of the typical resonances of a tapped horn design have been pushed up past 100Hz and out of band for most apps involving this cab. Distortion is very low when the cab is not being driven to the end of its rope. Waterfall and group delay measurements also look better than expected with some slight ringing near 110Hz but even that being better controlled than expected.