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:
“God sent children for another purpose than merely to keep up the race—to enlarge our hears; and to make us unselfish and full of kindly sympathies and affections; to give our souls higher aims; to call out all our faculties to extended enterprise and exertion; and to bring round our firesides bright faces, happy smiles, and loving, tender hearts.”
—Mary Botham Howitt (20th century)
“Whoever considers morality the main objective of human existence, seems to me like a person who defines the purpose of a clock as not going wrong. The first objective for a clock, is, however, that it does run; not going wrong is an additional regulative function. If not a watch’s greatest accomplishment were not going wrong, unwound watches might be the best.”
—Franz Grillparzer (1791–1872)
“And is the price for your acceptance for me to conform? To be as you would want me to be?... You must accept me as I am. Do not question.... If my behavior seems different perhaps it is because it serves a higher purpose than to find acceptance in this dull and useless world.”
—Pat Fielder, and Paul Landres. Dracula (Francis Lederer)