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Channel Strip in an Audio Mixing Board
Transcript of Channel Strip in an Audio Mixing Board
This amount is not affected by the possible variations in the channel output fader. Channel strip in an Audio Mixing Board INPUT SECTION GAIN PRE FADER
AUXILIARY SENDS EQ & FILTER SECTION PRE
SENDS MUTE & FADER SECTION PANORAMIC SECTION PAN MIC
IN LINE IN Here you can:
Select between MIC IN and LINE IN.
Activate PHANTOM POWER or +48V.
Adjust the level of the input signal to the Reference Level or Line Level with the GAIN POT.
Insert an external processor (EQ, Dynamics, etc.) into the signal chain using the INSERT POINT. + 48V INPUT
POINT SEND RETURN INSERT LOOP The INPUT GAIN stage allows to adjust the level of the input signal from a wide variety of sources: from a low sensitivity dynamic microphone to a hot line level device output.
This is the most important stage in the signal flow. Here we can send the signal of the channel to a number of auxiliary outputs taking the signal before the fader.
These Auxiliaries Sends are SUMMING BUSES, where all the audio signals sent to a same Auxiliary are mixed in that Auxiliary Send. There can be several Auxiliaries Sends, usually between 1 to 12. EQUALIZER
FILTER Audio Signal from a microphone or DI Box Audio Signal from a device line output Here we can process the signal in the frequency domain. Usually we can:
Filter a band of frequencies: typically we have a High Pass Filter (HPF), that attenuates low frequencies.
Boost or lower the amplitude of certain frequency bands with a Parametric EQ. Parametric EQ is the most common equalizer you can find in a mixing board. It usually has four Peak type bands of operation with adjustable gain, frequency and Q (band width) per band. The lower and higher bands may also be Shelving type with adjustable gain and frequency in this case. EQ section example from a Neve board High Pass Filter is the most common filter you can find in a mixing board. It may have an adjustable cutoff frequency. It acts filtering the frequencies below the cutoff frequency. Some boards may have a Low Pass Filter (LPF) that acts filtering the frequencies above the cutoff frequency. Filter section example from a Neve board Auxiliary Sends example from a Neve board MUTE F
R Here you can mute or cut the signal with the MUTE BUTTON in this point of the chain.
And, of course, you can adjust the amount of signal level going out from the channel through the outputs with the FADER. The adjustment can vary from -∞ (no signal passing through) to 0 db (unity gain: it goes out the same signal level that enters the fader) to +10 db (the fader boosts the signal level 10 db). We can adjust the amount of the sent signal with the Aux Send Pot. It usually varies from -∞ (no send) to +15 db (15 db more than unity gain).
In this case this amount is affected by the possible variations in the channel output fader. Auxiliary Sends example from a Neve board POST FADER
AUXILIARY SENDS POST
SENDS Here we can send the signal of the channel to a number of auxiliary outputs taking the signal after the fader.
These Auxiliaries Sends are SUMMING BUSES, where all the audio signals sent to a same Auxiliary are mixed in that Auxiliary Send. 3-pin XLR female connector 1/4" TRS or TS connector CENTER LEFT RIGHT Here we can distribute the signal between LEFT and RIGHT on the way to the MAIN STEREO OUTPUTS, or odd and even BUSSES on the way to the OUTPUT BUSSES. We pan with the PAN POT, a potentiometer that allows us to distribute the signal in a continuous way from LEFT (or ODD BUS) to CENTER (or ODD and EVEN BUSSES in the same amount) to RIGHT (or EVEN BUS). PAN POT section in a Neve board OUTPUT
ROUTING ROUTING SECTION Here we can route or assign the signal after the PAN to the different outputs: the MAIN STEREO OUTPUTS and the OUTPUT BUSSES. The ROUTING OPTIONS are usually laid in buttons representing pairs:
L-R or MAIN STEREO.
1-2, 3-4, 5-6, etc. for the BUSSES.
The amount of signal fed to each side of the pair is driven by the PAN POT, don't forget it ! ROUTING SECTION in a Neve board LEFT RIGHT LEFT, BUSSES# 1, 3, 5, 7, etc. RIGHT, BUSSES# 2, 4, 6, 8, etc. Some boards have these sections swapped