Earthquaker Speaker Cranker OverdriveThe Speaker Cranker is an all discrete dirt enhancement device designed to give your signal some grit and a slight boost without drastically changing the character of your tone. Its perfect for those that dont like to fiddle with pesky controls yet want to add a little tube like breakup or enhance an already over driven amp (or pedal) to give it some extra crunch without over loading the preamp. The single More control allows you choose the amount of