Hand-Built in Brooklyn Each SR125x is hand-built by our team in Brooklyn. This headphone goes from workbench to workbench until it’s ready for your ears. We started building on a kitchen table in 1953, and every experience since then has led to the creation of the SR60x. 4th Generation Grado drivers are here. Specifically tuned for the SR225x, this new speaker design features a more powerful magnetic circuit, a voice coil with decreased effective mass, and a reconfigured diaphragm. Reengineering these components for our 44mm drivers improve efficiency, reduces disortion Along with the speakers, the cables and headband have been redesigned for the SR225x. Now housed in a more durable exterior, the 8-conductor cable transfers more information and features a super annealed copper wire for improved purity of the audio signal. The new headband features more cushion for a comfier experience.