BSS Audio AR-133 Active DI Box

Industry Legend Active Direct Box / Line Balancer
BSS Audio AR-133 Active DI Box


The AR-133 Active DI Box from BSS Audio uses an enhanced version of the same audio path as the AR-116, regarded by many as a reference standard.

The sound quality is legendary, particularly on acoustic and bass guitars. Numerous applications can be satisfied by the AR-133. As well as the traditional guitar use, the AR-133 can be used with keyboards, DJ consoles, amplifier outputs, and other electronic sources. An additional bonus is the ability to use the AR-133 as an active balancing device. 

The input connectors are both 1/4" jack sockets and an XLR socket, the latter meaning that the AR-133 can be used to convert unbalanced signals to a balanced output on XLRs throughout.

The arched case allows cables to run back underneath the unit from the end for neat cable management. Input attenuation is 0, -20 or -40dB, making the box suitable for instrument, line or amplifier levels on inputs. On the output side, a ground-lift switch is provided for quick solutions to ground-loop problems. 


  • Switchable input attenuation
  • 0dB for guitar-type pickups-
  • 20dB for line levelsignals
  • -40dB for speakerfeeds 
  • Matches the level and impedance with unity gain withoutloading the source
  • Can drive signals up long cable lengths
  • Powered from consolephantom power or internal battery
  • Automatic switchover to battery if phantom power fail
  • Parallel Link Jack output to feedamplifiers directly
  • Parallel XLR input forconverting unbalanced outputs to balanced lines


Input Impedance 

  • 1M Ohm (pad at 0dB)
  • 47k Ohm (pad at -20dB)
  • 47k Ohm (pad at -40dB)

Max Input Level

  • +9dBu (pad at 0dB)
  • +29dBu (pad at -20dB) 
  • +49dBu (pad at -40dB) 


  • Two Parallel 1/4" jack connectors and a parallel XLR connector (unbalanced)


  • Tip Hot (+ ve)
  • Sleeve Ground


  • Pin 2 Hot (+ve)
  • Pin 1 & 3 Ground

Output Section

  • Output -  Transfer Balance
  • Max. Output Level - +8dBu into 600 Ohms or greater
  • Connector - XLR3-32 or equivalent

System Performance

  • Distortion (THD) - < 0.005% at 1khz, 0dbu output
  • Noise -  < -105db unweighted, 22hz-22khz, rms* 
  • Frequency Response - 30Hz to 20kHz, +0dB/-1dB


  • Main/Standby battery - 9 volt PP3 type, preferably alkaline
  • Current drain -  on phantom - less than 7.5mA/ on battery - less than 2mA.
  • Phantom Power - +20 volts DC to +48 volts DC
  • Weight - 650g
  • Dimensions - 59 mm x 124 mm x 143 mm


  • Standard Delivery - Free
  • Express Delivery - $20
  • Store Pick Up (South Melbourne) - Free

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