Final Audio Design Sonorous X Dynamic Driver Headphones (Metal)The prestige model of the Sonorous series, Sonorous X eliminates compromise. The 50 mm diameter driver unit with titanium diaphragm is integrated with the front plate and has been machined from pure aluminum. The principal parts are composed of machined aluminum and stainless steel. This is a resolute prestige model, the zenith of the Sonorous series. BAM (Balancing Air Movement) Mechanism A BAM (Balancing Air Movement) mechanism developed for