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.
An additional bonus is the ability to use the AR-133 as an active balancing device.
ARCHITECT’S AND ENGINEER’S SPECIFICATION
AR-133 ACTIVE DI BOX / LINE BALANCER
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 40dB), and Power On/Off.
The unit shall be housed in an aluminium extrusion fitted with isolating side-cheeks. The unit shall be sufficiently screened so it is not susceptible to external magnetic fields.
Specifications
| 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 |
| Unit Weight | 650 gms, excluding batteries |
| Dimensions | 59 mm x 124 mm x 143 mm (2.3″ x 4.9″ x 5.6″) |
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