The Aker system is a pretty powerful portable rechargeable speaker system. It's simplicity, portability, and ruggedness is why many of us use the system. It's also relatively inexpensive, I picked mine up new for about 27$ with shipping hunting off of fleabay. If you want a voice distortion system most of us tie in a system that alters our voice into the overall system (the output goes to the aker system). You can use an old cell phone or ipod touch pretty easily to do this. Software for distorting your voice runs about 2 to 6$ depending on what you choose. There are a bunch of threads here on the forums about what people have done.