The EAS is a relatively simple and flexible kits to install. Having only 4 main components (mics, speakers, amplification board and battery pack) connected with plenty of wire means that you have lots of options with regard to installation. Here are a few installation examples from folks using the EAS.
My Speaker Installation Method
This is the method I used to wrap my speakers for comfort and install them in my helmet. The only difference between these photos and my installation is that I hot-glued my speakers to the helmet, as opposed to using Velcro.
Stormtrooper TK Helmet
In this installation, mini mics were chosen, and installed into the teeth. As the mic faces are black, they are virtually invisible from the front. The regular mics could have been used just as easily.