Audio Technologies BI400
IHF to PRO, 4 Channel INterface Converter with RCA to XLR


The Audio Technologies Inc BI400 is an interface amplifier designed to interconnect consumer grade and semi-professional equipment into professional, balanced, low impedance audio systems.

The BI400 is a bi-directional stereo interface, which bridges a stereo pair of professional 600 ohm balanced or unbalanced +4dBm lines and converts those signals to a nominal .25 volt IHF level (-10dBu). The IHF output can feed, for example, the record inputs of a consumer grade cassette or DAT recorder. Simultaneously the BI400 also converts the unbalanced, high impedance, stereo, .25-volt IHF playback outputs from the tape deck to a +4dBm output capable of driving balanced or unbalanced lines of 600 ohms or greater line impedance.

Audio Technologies Inc BI400 Features:

  • Quiet, external UL approved 24VDC wall mount power
  • Gold plated RCA type phono jacks
  • Stackable as two or three
  • Separate LEDs for each 1X4 channel indicate either output clipping(standard) or input signal presence (special order -S)

Audio Technologies Inc BI400 Specifications:

  • Gain: -14dB nominal, -8dB maximum. +14dB nominal, +22dB maximum. User adjustable for -10dBu (.25V), User adjustable to 0, +4 or +8dBm output with 0, +4 or +8dBm inputs output with -10dBu (.25V) input.
  • Nominal Levels: +4dBm input, -10dBu (.25V) out -10dBu (.25V) in, +4dBm out
  • Peak Levels: +22dBm in, +8dBu (2.0V) out +8dBu (2.0V in), +22dBm out
  • Noise: 20kHz B.W.: -90dBu maximum output -80dBm maximum output
  • Harmonic Distribution: .02% Max at Peak Level .02% max. at Peak Level 20Hz to 20kHz .005% max. at Nominal Level .005% max. at Nominal Level
  • Frequency Response: +.25dB, 20 to 20,000Hz +.25dB, 20 to 20,000 Hz
  • Crosstalk: 70dB minimum at 10kHz 70dB minimum at 10kHz
  • Input Impedance: Balanced, 20kohm bridging Unbalanced 10,000 ohms
  • Output Impedance: Unbalanced, 1500 ohms max. Zs. Balanced, 40 ohms maximum
  • Dimensions: 1.5" H x 5.5" W x 5.75" D
  • Weight: 1.5 lbs net
  • Connectors: XLR (balanced input/outputs) & RCA phono jacks (unbalanced input/outputs)
  • Power: 24VDC @ .07A, Connector sleeve
  • Power Supplies: All units require 24VDC power supply, which is ordered separately. They can share a single supply-using loop thru DC cable (P/N 20602-1). Do not exceed rated supply current
  • Warranty: Limited, one year

WARNING: Cancer and Reproductive Harm -

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