Headphones with built-in am Plug technology that allows you to obtain AC30 tone immediately * Headphones made by Audio-Technica, the trusted name in headphones * The headphone amp uses a new reactor circuit that"s based on the Valve Reactor technology featured in Vox amps, delivering incredibly dynamic AC30 tone * Totally analog design that faithfully simulates the circuit response of the original amp * Faithfully reproduces the classic Vox AC30 tone