ATH-MSR7GM SonicPro Over-Ear High-Resolution Audio Headphones Gun Metal. Let the music be... Springing from Audio-Technica’s rich heritage in professional audio, the ATH-MSR7 Over-Ear High-Resolution Audio Headphones are designed to reproduce Hi-Res Audio, allowing users to hear music the way it was intended. The over-ear headphones are outfitted with exclusive 45 mm True Motion Drivers, which utilize lightweight voice coils, a custom-mounted printed circuit board and specially designed diaphragm to improve transient response and minimize sound distortion for rich, detailed audio reproduction.