Radical thought- Use 2 pair of speakers

Ok this sounds crazy at first but, is it possible and practical to hook up two sets of speakers for your mains. Each pair has it's own unique characteristics to why not add them together? It is still a 2 channel system. A bigger sound stage? If you have two matched amps, dedicate one to each? I know there are many reason why this cuts accross conventional logic but has anyone tested this theory?