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The AR-133 Active DI Box from BSS Audio 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.

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

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BSS Audio AR-133 Active DI Box Features:

Switchable input
attenuation
0dB for guitar-type
pickups
-20dB for line level
signals
-40dB for speaker
feeds
Matches the level and impedance
with unity gain without
loading the source
Can drive signals up long cable
lengths
Powered from console
phantom power or internal
battery
Automatic switchover to battery
if phantom power fails
Parallel Link Jack output to feed
amplifiers directly
Parallel XLR input for
converting unbalanced outputs
to balanced lines

BSS Audio AR-133 Active DI Box Specifications:

Input Section

Input Impedance
1MOhm (pad at 0dB)
47kOhm (pad at -20dB)
47kOhm (pad at -40dB)

Max Input Level
+9dBu (pad at 0dB)
+29dBu (pad at -20dB)
+49dBu (pad at -40dB)

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

Jack:
Tip Hot (+ve)
Sleeve Ground

XLR:
Pin 2 Hot (+ve)
Pin 1 & 3 Ground

Output Section
Output: Transformer Balanced
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

General
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: 650 gms, excluding batteries.
Overall Dimensions: 59 mm x 124 mm x 143 mm (2.3" x 4.9" x 5.6")