Amazon calculates a product's star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers and factors that establish reviewer trustworthiness.
Quality of the product is average, though its very loud but base and treble is not that distinguishable. More over finishing of the product is not so great. One of the stickers on it has already come off and wood work behind can been seen. It's been only few days since i got them, let's see how long it works.