The PS 1000s are the product of 50 years of research. Plus, Grado has realized that the body of the headphone must not resonate so they enclose the drivers in a hardwood covered by aluminum. As a result, the bass is subterranean and the definition never blurs. This is a fully mature design and built in America. Grado has also researched and developed new connecting cables offering a much more sophisticated wire and connector than ever before. It all results in a killer set of cans.