ADDAC711 is a dual channel Isolated DI box and is all about keeping the sound coming into your Modular free from any undesired noisy interferences, making sure that what you’re getting from your inputs is what your external hardware is actually producing. It provides galvanic electrical isolation between the Modular system and external sources preventing impedance mismatch and ground loop induced hum.
ADDAC’s 711 circuit is designed around a unity 1:1 type Audio Transformer operating in the 20 Hz to 20 KHz range, this impedance matching transformer provides two fully balanced outputs (via XLR connectors).
The LIFT/FLOAT/GND 3-way switch lets you choose between lift, ground or floating ground:
- In the LIFT position (left) the module circuit will be “lifted” to ground through a 100R resistor and a 10nF capacitor.
- In the FLOAT position (middle) Ground will not be shared leaving ins and outs grounds completely apart from each other fully isolating both signals.
- In the GND position (right) Ground will be shared between inputs and outputs; here no isolation is used.
Any of these three positions may be the best form of avoiding ground loops or any other undesired interference occurring between your modular and the external hardware. Try these options and see what works best in any given situation.
The ADDAC711’s Inputs accept not only XLR balanced but also TS Mono jacks and TRS balanced jacks.
Note: The ADDAC711 is meant to be used with line signals. Mic and instrument levels will still need to be amplified to line level prior to the module.
Specifications
- Width: 6hp
- Depth: 40mm
- Power: +12V 40mA / -12V 40mA
