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L2404-USB
USB MIXER
EQUALIZATION
Electronic filters that adjust the level of certain frequencies. Used for tone enhancement or to reduce extraneous sounds. Two types
of EQ shapes are peak and shelving, described below.
IMPEDANCE
Resistance in an electrical circuit measured in Ohms (Ω). Maintaining proper impedance is important to correctly manage signal
level, frequency response, and in the case of amplifiers and speakers, power loading on the amplifier. The output of a guitar, for
example, is high impedance and should be connected to a Direct Injection box or “DI” if you want to connect it directly to a low
impedance input on a mixer
PEAK EQUALIZER CONTROL
Increase or decrease of a frequency range centered at a specific point, resulting in an EQ curve that looks like a hill (increase) or
a valley (decrease).
PHANTOM POWER
A supply voltage that runs through a microphone cable to power condenser microphones. Harmless to microphones that don't
need it, except for very old and/or damaged ribbon microphones.
REVERB
An audio effect that emulates the echo reflections and decay time of a large space.
SHELVING EQUALIZER CONTROL
Increase or decrease of all frequencies above or below a specific frequency.
TRS
Acronym for Tip-Ring-Sleeve — the three parts of a three-conductor (including shield) audio plug. TRS phone plugs are often used
for “balanced” mono connections, or "unbalanced" stereo connections (e.g. headphones).
TS
Acronym for Tip-Sleeve, the two parts of an unbalanced, two-conductor (including shield) phone plug. TS connectors are
sometimes called mono or unbalanced plugs or jacks.
UNBALANCED
A two-conductor (including shield), high-impedance connection. These are most commonly used for instrument connections and
cable runs of less than 20 feet. RCA or “Phono” cables are unbalanced.
UNITY GAIN
This means that the inputs and outputs are set at the same level. To set the gain correctly, first set the fader to the unity marking
on the fader channel (0). Then plug in the source to the input channel and adjust the Gain knob to the maximum you can
before distorting the input. Usually you will see the Clip indicator LED flash, which means the gain input is too high. Adjust the
knob so that the signal is below clipping. Once you have this balanced correctly you will have unity gain on the channel input.
XLR
The three-pin connector universally used for balanced audio connections. A balanced connection reduces outside noise and
interference. (See Balanced above.)
GLOSSARY OF TERMS
