STAX is a legendary manufacturer in the field of electrostatic headphones, and the founder of the world's first electrostatic transducer headphones, with more than 50 years of technical precipitation, and was acquired by Edifier in 2012. The STAX SR-Ω (OMEGA) in the last century was once considered a strong competitor to Orpheus, but unfortunately it has been difficult to popularize due to cost and selling price. Years later, the company reorganized and reborn a generation of kings, and in 2012, the rightful successor to OMEGA, SR-009, was released. In the six years since its release, SR-009 has not diminished in the slightest, and until 2017, it was still on the list of winners of the 10 to 200,000 yen bracket of the Japanese VGP. The SR-009 brings out the best in the electrostatic headphones, described by The Absolute Sound as "an almost completely neutral balanced tone with excellent stretch at both ends of the spectrum, transients and transparency that is simply astounding." "From the perspective of potential, SR-009 can be said to be as good as the front end is, and it is extremely suitable for ultra-high-end players, and the annual production of less than 300 pairs also makes its price as high as 330,000 yen, that is, about 20,000 yuan. If you're interested in the natural transparency of electrostatic headphones, the SR-L700 is a cost-effective option, inheriting a diaphragm technology similar to that of the STAX 009, but with a slight reduction in appearance and materials, and the official price of 135,000 yen is less than half of the SR-009.