Audio Technologies BI100, BU400, UB40 User Manual

IHF to PRO Interface Amplifiers

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BI400 BU400B UB400B

The BI100, BU400 and UB400 are interface amplifiers designed to interconnect consume
grade and semi-professional equipment into professional, balanced, low impedance audio
systems.

The BI100 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 .25volt
IHF level (-10dBu). The IHF output can feed, for example, the record inputs of a consume
grade cassette or DAT recorder. Simultaneously the BI100 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.

The UB400 is a uni - directional four-channel interface that converts four IHF level signals into
four balanced professional outputs. The UB400 is particularly useful in protecting the four,
eight or sixteen main or monitoring IHF outputs of low cost mixers and tape decks. The UB400
is also a very low cost way to interconnect two CD players into a balanced system.

The BU400 is also a uni - directional four channel interface but it converts four balanced
professional signals into IHF levels suitable for feeding the line inputs of a multi-channel tape
deck, DAT machine or mixer.

• 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)

IHF to PRO Interface Amplifiers

Technical Specifications

BI400 BU400B UB400B

GAIN

NOMINAL LEVELS
PEAK LEVELS
NOISE 20kHz B.W.:
HARMONIC
DISTRIBUTION

FREQUENCY
RESPONSE
CROSSTALK
INPUT IMPEDANCE
OUTPUT IMPEDANCE
DIMENSION
CONNECTORS

POWER

POWER SUPPLIES

WARRANTY

-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.
+4dBm input, -10dBu (.25V) out -10dBu (.25V) in, +4dBm out.
+22dBm in, +8dBu (2.0V) out +8dBu (2.0V) in, +22dBm out.

-90dBu maximum output -80dBm maximum output.
.02% Max at Peak Level .02% max. at Peak Level 20Hz to 20kHz

.005% max.
at Nominal Level .005% max. at Nominal Level
+.25dB, 20 to 20,000Hz +.25dB, 20 to 20,000 Hz.

70dB minimum at 10kHz 70db minimum at 10kHz.
Balanced, 20kohm bridging Unbalanced 10,000 ohms.
Unbalanced, 1500 ohms max. Zs. Balanced, 40 ohms maximum.

1.5"H by 5.5"W by 5.75"D; Weight: 1.5 Lbs. Net.
XLR (balanced input/outputs) & RCA phono jacks (unbalanced

input/outputs).
24VDC @ .07A - BI100 & UB400, 24VDC @ .04A - BU400,

Connector sleeve
is positive.
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.
Limited, One Year Warranty