Well, some thing plain don't need instructions.  Take interconnect cables; connect one end to the source and the other end to the amp.  If no improvement is detected, return to sender. Now, I don't know how complex or otherwise the instructions are for the Phonosophie LED box, but let's assume I'd read them, understood them and implemented them.  If I could hear no difference, why on earth would I want to be bothered with ringing someone up to ask why it wasn't working?  Surely I'd just think 'ah well, back to the drawing board' and get on with my life?