Better than ultrasound? – You bet. Ultrasound you wouldn't be able to hear. But the Ultrasone Signature Master [€949] you can. Like the firm's Signature Natural [€649] and Signature Pulse [€549], this over-ear headphone exploits their new S-Logic-3 tech which deals with driver orientation relative to the ear canal and includes special deflectors. Aimed at mastering engineers, the Signature Master uses a 40mm titanium/mylar membrane in a sealed composite housing.