The BSS AR-133 Active DI Box is a highly regarded tool in professional audio engineering, renowned for its reliability and versatility in converting high-impedance instrument signals to balanced, low-impedance outputs. It features a robust design with a high-quality transformer that ensures transparent signal conversion, preserving the integrity and clarity of the audio signal even over long cable runs. The AR-133 is equipped with a switchable input pad to accommodate a wide range of input signal levels, making it suitable for use with both line-level and instrument-level signals. It also includes a ground lift switch to help eliminate hum and buzz caused by ground loops, ensuring clean and noise-free audio output.

Transformer-Balanced Inputs and Outputs:

• • • Provides high-quality, transparent signal conversion from unbalanced to balanced signals.
    • Helps maintain signal integrity and fidelity over long cable runs.

  • Input Pad:

    • Switchable input pad (0 dB, -20 dB, -40 dB) to accommodate a wide range of input signal levels.
    • Allows for connection of both high-output instruments and line-level sources without distortion.

  • Ground Lift Switch:

    • Helps to eliminate ground loop hum and buzz by isolating the input ground from the output ground.
    • Improves audio clarity and reduces noise interference.

  • High-Input Impedance:

    • High-impedance input suitable for connecting instruments such as electric guitars, basses, keyboards, and acoustic instruments.
    • Ensures compatibility with a variety of musical instruments and audio sources.

  • Versatile Connectivity:

    • 1/4″ TS input jack for instrument connection.
    • Parallel link output for direct connection to amplifiers or other devices.

  • Durable and Compact Design:

    • Rugged metal construction for durability and reliability in professional environments.
    • Compact and portable design for easy integration into any audio setup.

  • Power Options:

    • Can be powered by a 9V battery or phantom power (via XLR input).
    • Provides flexibility in powering options based on the setup and environment.

  • LED Indicators:

    • Battery status indicator for monitoring battery life when using battery power.
    • Signal presence and overload indicators for monitoring input signal levels.

  • Applications:

    • Ideal for live sound reinforcement, recording studios, broadcast, and any application requiring high-quality DI functionality.
    • Essential for connecting instruments to mixers, audio interfaces, and other professional audio equipment.

  • Quality and Reliability:

    • Manufactured by BSS Audio, renowned for producing high-performance audio equipment.
    • Designed to meet professional audio standards, ensuring reliable operation and superior sound quality.

Type: Active DI Box
Audio Inputs:
Input Type: 1/4″ TS jack (unbalanced)
Input Impedance: 1 MOhm (pad at 0 dB), 47 kOhm (pad at -20 dB), 10 kOhm (pad at -40 dB)
Audio Outputs:
Output Type: XLR (balanced)
Output Impedance: 600 Ohms balanced
Pad Switches:
Input Pad: 0 dB, -20 dB, -40 dB switchable
Ground Lift: Lifts pin 1 on the XLR output to help eliminate ground loops
Power Options:
Power Supply: 9V battery (PP3 type, included), or phantom power via XLR input (+48V)
Performance Specifications:
Frequency Response: 30 Hz to 20 kHz (±1 dB)
Total Harmonic Distortion (THD): Less than 0.005% at 1 kHz
Dynamic Range: 100 dB, typical
Maximum Input Level: +9 dBu at 0 dB pad, +29 dBu at -40 dB pad
Output Level: +4 dBu (nominal), +21 dBu (maximum)