The TH909 offers a wider dynamic range and low distortion, utilizing a 1.5 Tesla 50mm driver with repulsion magnets. The diaphraghm is constructed from Biodynina, accomplishing rich low-end frequencies, natural mid-range, and an excellent presence in high-frequency production. The housing features a double-layer structure composed of etching metal, diversifying the resonance points and presenting a gorgeous appearance. It is finished with a Japan Lacquer in Bordeaux manufactured by the Sakamoto Urushifactory, established 110 years ago. The TH909 includes a detachable 7N grade (99.999999%) high-purity OFC (Oxygen Free Copper) unbalanced cable (ET-H3.0N7UB) featuring a plug sleeve made of durable duralumin and rhodium-plated connections. Interior witing is also constructed from 7N grade materials. The newly-designed earpad uses a low-resilience cushion for a more comfortable fit.