Steve has offered his Wicked One plans to the world at no charge. If you follow the links you will find the page with free plans.

The original design is based upon a pair of ten inch drivers. He also recommends building  the same style of enclosure for a pair of twelve inch drivers, but you will need to increase the height of the enclosure to support the larger drivers. No other changes are necessary, nor recommended.

A few people have tried to use fifteens in the original design, by angling the baffle and increasing the height of the enclosure. The resulting sound quality seems to be more dependent upon the actual driver you choose as you move away from the original design specification. I have built several ten inch versions using great and even so-so drivers and it has always worked. I have built two sets of twelve inch enclosures, same, but taller, and they worked fine as well.

I can not tell you anything first hand about using fifteen inch drivers, since I have not built one using my own fifteens, yet. Others have tried, as I mentioned, and you can still find their threads if you give the place a search.

I would recommend using Steve's ten inch drivers for your first attempt. It will knock your socks off!


... or if you are set on using fifteens and scaling things up by a bit, then do take lots of pictures and post your results often.  I have wanted to try this for several years, but things have changed more than once and I have gone back to established, pro-audio designs for the fifteen and eighteen designs I have used recently. There are several of us who would love to see a success story in using fifteens, instead of the typical results which are not as stellar as using tens or twelves.

BTW, I am not into car audio, so my experience with these enclosures is in pro-audio (bands, performing live, churches with large sound systems)  and my back yard - out in the wide open. I can wholeheartedly recommend the original design, ease of construction and superlative results, from this challenging perspective, which is considerably more demanding than car audio.

one more quick question should i stick with the 36 x36 box with the height i need..or do you get the same resulst if say i wanted to do 49 wide 36 deep?....

that is loud