AR-133 Active DI Box/Line Balancer


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    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 aluminum 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 -40 dB, 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.

    An additional bonus is the ability to use the AR-133 as an active balancing device.



    The Active Direct Inject box shall provide a transformer balanced and isolated feed from a source input via a 1/4" TRS jack or 3-pin XLR-type connector. The output of the DI box shall be via an XLR connector. The unit shall also provide a 1/4" TRS jack in parallel with the input to act as a link for line bridging. The link shall be a direct feed from the input, or shall optionally be fed from an actively buffered input signal.

    The unit shall be powered either via a phantom power source, or via a standard PP3 type 9 volt battery. An led shall illuminate continuously to show power is provided by a phantom source, or flash approximately every 2 seconds if powered by the battery.

    Switches shall be provided for: EARTH LIFT (output pin 1 disconnected from unit ground), INPUT ATTENUATION (of 0, 20 or 40 dB), and Power On/Off.

    The unit shall be housed in an aluminum extrusion fitted with isolating side-cheeks. The unit shall be sufficiently screened so it is not susceptible to external magnetic fields.

    The Active DI box shall be the BSS Audio AR-133.

    Input Impedance: 1 MOhm (pad at 0 dB), 47 kOhm (pad at -20 dB or -40 dB)
    Max Input: +9 dBu (pad at 0 dB), +29 dBu (pad at -20 dB), +49 dBu (pad at -40 dB)
    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: +8 dBu into 600 Ohms or greater
    Output Connectors: XLR3-32 or equivalent
    THD: < 0.005% at 1 khz, 0 dbu output
    Noise: < -105 db unweighted, 22 hz-22 khz, rms*
    Frequency Response: 30 Hz to 20 kHz, +0 dB/-1 db
    Main/Standby battery: 9 volt PP3 type, preferably alkaline
    Power Consumption: on phantom: less than 7.5 mA, on battery: less than 2 mA.
    Phantom Power: +20 volts DC to +48 volts DC
    Unit Weight: 650 gms, excluding batteries
    Dimensions: 59 mm x 124 mm x 143 mm (2.3" x 4.9" x 5.6")
    More Information
    ManufacturerBSS by HARMAN
    Manufacturer Model NumberAR133
    Manufacturer Part NumberAR-133
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