Take a look at these links:
https://drive.google.com/a/ashevilleplaygrounds.com/file/d/0BzQ6s9CUyWnUNjVFck1vUFVFcDg/view?pli=1
http://www.audiodesignguide.com/full/conus1.html
Best of luck with the DIY build Asvjerry.
https://drive.google.com/a/ashevilleplaygrounds.com/file/d/0BzQ6s9CUyWnUNjVFck1vUFVFcDg/view?pli=1
http://www.audiodesignguide.com/full/conus1.html
Best of luck with the DIY build Asvjerry.