Thursday, February 16, 2012

Passive DI units

A acquiescent DI assemblage about consists of an audio agent acclimated as a balun. The turns arrangement is about called to catechumen a nominal 50 kΩ arresting antecedent (such as the alluring auto of an electric guitar) to the 100–200 Ω accepted by the ascribe of an audio mixer. Typical turns ratios are in the ambit of 10:1 to 20:1.12

Less commonly, a acquiescent DI assemblage may abide of a arresting load, with or after capacitor coupling. Such units are best ill-fitted to outputs advised for headphones or loudspeakers.

The cheaper acquiescent DI units are added affected to hum,34 and acquiescent units tend to be beneath able than active. However, they crave no batteries, are simpler to use, and the bigger units are acutely reliable if acclimated as designed.

Some models accept no settings, while others can accept a arena lift about-face (to abstain arena bend problems), a pad about-face (to board altered antecedent levels) and a clarify about-face for appearance the sound.5

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