The STAX SR-007A is exceptional! They do that thing that electrostatic earspeakers do with transparency—they bring it like no other headphone technology can (planar, dynamic driver)—and they marry that transparency to incredible musicality, free of distortion in all its forms. Suffice to say,  that transparency, clarity, speed, soundstage are all next-level plus with the SR-007A. Further, the STAX SR-007A weaves a  naturalness and a coherency across the frequency spectrum, coupled with all of its other talents, that induces, as mentioned above, a quasi-conscious ecstasy. Lastly, the SR-007A doubles down on what its sibling provides and will draw you quickly down that road of no-return-electrostatic-musical-bliss.