The Behringer Ultra-DI DI-100 Direct Box puts an end to hum and impedance problems. It features an extremely flat frequency response and ultralow noise for superior audio quality. An internal battery is automatically decoupled when phantom power is used. Solid metal chassis and 4 sturdy rubber legs protect the Ultra-DI from damage on tour. Frequency response: 10Hz to 90kHz. Noise level: -102dBu.