Purpose
The Direct Input box takes a high impedance, unbalanced signal and converts it to a low impedance, balanced signal.
This allows the signal to be sent over long cable runs with significantly less signal loss (especially in high frequencies) due to the lowering of the impedance, and greater rejection of interference due to the benefit of common mode rejection in a balanced signal. Furthermore, the lower impedance (around 600 ohms is normal) allows an insignificant load to the input of a mixing console or preamp which is also designed to accept input from low impedance microphones.
Read more about this topic: DI Unit
Famous quotes containing the word purpose:
“Natural selection, the blind, unconscious, automatic process which Darwin discovered, and which we now know is the explanation for the existence and apparently purposeful form of all life, has no purpose in mind. It has no mind and no mind’s eye. It does not plan for the future. It has no vision, no foresight, no sight at all. If it can be said to play the role of the watchmaker in nature, it is the blind watchmaker.”
—Richard Dawkins (b. 1941)
“Culture is the tacit agreement to let the means of subsistence disappear behind the purpose of existence. Civilization is the subordination of the latter to the former.”
—Karl Kraus (1874–1936)
“Let our hearts, as subtle masters do,
Stir up their servants to an act of rage
And after seem to chide ‘em. This shall make
Our purpose necessary, and not envious;
Which so appearing to the common eyes,
We shall be called purgers, not murderers.”
—William Shakespeare (1564–1616)