The all-analog DI-400 is a professional-grade four-channel active Direct Input ("DI") box with a built-in Sonic Maximizer processor on each channel.

An active direct box, the DI-400's design is completely transformerless. Nothing to color the sound, its transparency reveals the free expression of the instrument’s voice.


  • Ideal for touring sound applications and recording studios
  • Keyboards
  • Active bass guitars
  • Passive bass guitars
  • Acoustic guitars
  • Electric guitars
  • The DI-400 is an excellent choice for transferring any musical instrument signal direct to a mixing console.

Features include

  • 4-channel direct
  • Front and rear inputs
  • BBE Sonic Maximizer on each channel


  • Frequency response @ line out
    • Process mode: program controlled
    • Bypass mode: 10Hz to 50kHz (±1dB)
  • Signal to noise ratio (per channel)
    • BBE out: 118dB power supply (115dB 9v battery)
    • BBE in (@10): 115dB power supply (112dB 9v battery)
  • Total harmonic distortion (THD)
    • BBE out: less than 0.005% at -10dBu input (20 to 20kHz)
    • BBE in: 0.05% (20 to 20kHz)
  • Noise
    • BBE out: -105dBu
    • BBE in (@0): -94dBu
    • BBE in (@10): -85dBu
  • Input impedance
    • instrument: 1M Ohms
    • line: 12k Ohms
  • Output impedance
    • xlr: 600 Ohms
    • line: 1k Ohms (* 0dBu=0.775Vrms)

Designed and Engineered in USA
Made in China