What exactly does the DI-Box HR ?
19. Dezember 2011 - 12:08 — tauber
The purpose of a DI-Box is the "interfacing" of musical instruments or other signal sources to the "microphone" format of a mixing desk. To do so, it provides three major technical aspects:
First: It provides balancing to unbalanced signals
Microphone signal lines are balanced and therefore have great immunity of catching distorting signals than unbalanced signal lines.
Second: It provides galvanic isolation between source and mixer
Galvanic isolation eliminates ground-loop distortion noises without compromising electric safety standards like chassis grounding of the involved equipment.
Third: It provides impedance matching between the instrument and mic input
Microphone lines are not only balanced, but also terminated with a low ohmic resistance like 2 kiloohms, or less. Musical instruments are terminated with significantly higher values, like 100 kiloohms to 1 megohm.
This matching is achieved by up-transforming the the microphone lines terminating impedance typically by the factor of 100. This impedance transformation comes along with a level down-transformation, typically by 1/10.
Since microphone inputs are very sensitive and feature a lot of low noise amplification this is an ideal combination to perfectly match instruments to mixing desks without adding any noise, distortion & coloration from an "actice" device.
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