i put together a helmet contained voice amp system using a cheap halloween voice changer. i gutted the entire thing, jumpered the connections so it was just the voice amplifier, soldered in a new mic and a switch, then hotglued everything into place inside the helmet. i like the set up so much i'm going to do it with my boba helmet when i get done painting it. i plan on taking lots of pictures during the process and may even shoot a video of the process.