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Glossary of the letter "u"
All words also link to dictionary.com definitions for further information.
unbalanced - This typically refers to cables (usually with 1/4 inch jacks) with two conductors such as the standard guitar-to-amp cable. With 3 conductors it becomes "balanced" for by use of phasing properties and less interference in the signal.
unidirectional - a pick-up pattern which is more sensitive to sound arriving from one direction than from any other
unity gain - no increase or decrease in signal strength at the output of an amplifier or device compared to the signal strength at the input
upper midrange - frequencies between 2 kHz and 6 kHz