MDR-7509HD
The next model in Sony's pro line, the MDR-7509HD, uses a larger driver. Truesdell included the MDR-7509HD in his list of "top-of-the-line" headphones for digital audio production, under other models by Bose and Beyerdynamic. In 2008, The Sound Effects Bible listed the earlier MDR-7506 as essential for the "standard recording package", and the MDR-7509HD best suited to the "professional recording package", calling them "top-of-the-line Sony High Definition headphones".
Read more about this topic: Sony MDR-V6