BSS AR133 Active DI Box – 9V PP3 Battery or Phantom Powered

It takes an instrument, line or amplifier-level signal on a 1/4-inch jack or an XLR socket and sends a transformer-balanced output on a male XLR to the desk or stage box. The 0, -20 and -40dB input pad covers guitar and bass pickups, line-level keyboards and DJ consoles, and amplifier speaker outputs. The second input jack is wired in parallel, so you can take a feed on to the player's own amp. A ground-lift switch on the output side gives a quick fix for ground-loop problems.

BSS uses an enhanced version of the AR-116's audio path. The case is an aluminium extrusion with polyurethane end cheeks, and its arched shape lets cables run back underneath the unit from the end for neat cable management. It can also be used as an active balancing device for unbalanced sources. It matches level and impedance at unity gain without loading the source, and can drive long cable runs. The LED lights continuously on phantom power and flashes about every 2 seconds when the unit is running on its battery.

Connections

• Inputs: two parallel 1/4-inch jacks (tip hot, sleeve ground) and a parallel XLR (unbalanced, pin 2 hot, pins 1 and 3 ground)
• Output: transformer-balanced XLR
• Switches: input pad (0/-20/-40dB), ground lift, power switch with LED (steady on phantom power, flashing on battery)

Specifications

• Input impedance: 1MΩ (0dB pad), 47kΩ (-20dB or -40dB pad)
• Max input: +9dBu (0dB), +29dBu (-20dB), +49dBu (-40dB)
• Max output: +8dBu into 600 ohms or greater
• Frequency response: 30Hz to 20kHz, +0/-1dB
• THD: under 0.005% at 1kHz, 0dBu output
• Noise: better than -105dB unweighted, 22Hz to 22kHz
• Phantom power: +20V to +48V DC, under 7.5mA
• Battery: 9V PP3, preferably alkaline, under 2mA
• Dimensions: 59 x 124 x 143mm
• Weight: 650g excluding battery