The unit includes phantom power and battery supplies as standard. Should the phantom power from the console fail or be accidentally switched off, the AR-133 automatically switches over to the internal 9V battery providing uninterrupted use.

The unit is housed in a rugged aluminium extrusion case, with robust polyurethane end-cheeks which give the AR-133 a very distinctive look.

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.

The AR-133 uses an enhanced version of the same audio path as the AR-116, now regarded by many people as a reference standard. The sound quality is legendary, particularly on acoustic and bass guitars.

Numerous applications can be satisfied by the AR-133. For example, as well as the traditional guitar use, the AR-133 can be used with keyboards, DJ consoles, amplifier outputs, and other electronic sources.

BSS AR133 Active DI Box

  • Inputs

    • Input Impedance:  1 MOhm (pad at 0dB), 47 kOhm (pad at -20dB or -40dB)
    • Max Input:  +9dBu (pad at 0dB), +29dBu (pad at -20dB), +49dBu (pad at -40dB)
    • Input Connectors:  Two Parallel 1/4" jack connectors (Tip Hot +ve, Sleeve ground), and a parallel XLR connector (unbalanced) (Pin 2 Hot +ve, Pin 1 & 3 ground)


    • Output:  Transformer Balanced
    • Max Output:  +8dBu into 600 Ohms or greater
    • Output Connectors:  XLR3-32 or equivalent
    • 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
    • Power Consumption:  on phantom: less than 7.5mA, on battery: less than 2mA.
    • Phantom Power:  +20 volts DC to +48 volts DC

    Phyiscal & Dimensions

    • Weight:  650 gms
    • Dimensions:  59 mm x 124 mm x 143 mm