Such a flawed system. The sound only has to register, therefore the whole ground combining in voice to challenge a referee decision could register as the loudest point from the home fans. So it doesn't mean they give the best support, it just means Man U should bloody well be top given the size of their Stadium. Then you have acoustics to factor which is more down to the design of the ground than anything to do with the fans. So does louder mean better? Does it f**. Palace are the best set of home supporters imo.