The API 505-DI is a 500 Series DI module with traditional API discrete circuitry, switchable impedance and powerful tone shaping. Plug in your bass, guitar or synth into the front panel and juice up the gain to get API's signature punch on your tracks. A -20dB pad allows for the use of super-hot active instruments, while the tone control can clean up the mud or boost sub frequencies for a big, fat sound. The "Bright" switch adds a little polish and sheen to your signal, rounding out this module to be among the most versatile studio DIs around.