grado ps500e professional seriesThere's no escaping from the fact that the Grado PS500 headphones are an expensive set, but then this is no ordinary set of headphones. Part of the company's professional series, they're designed to produce stunning audio quality from all sources. They're also built using a lot of the same technology found in Grado's top of the range PS1000 headphones. In essence, then, you're getting a lot of the same audio quality for a third of the price.