Handbook for Sound Engineers

Sound System Design 1283

circuitry to perform the automatic mixing process
according to

(34-32)

where,

LN is the level in an individual mixer channel before the
automatic circuitry has attenuated that channel,

LN’ is the level in the channel after attenuation,

Sum(LN) is the sum of the levels in all channels before

they are attenuated,

all values are in decibel notation.

In effect, the equation says that each individual input

channel is attenuated by an amount in decibels equal to

the difference in decibels between the level of that

channel and the sum of all channel levels.

Figure 34-39. GL3800 block diagram of a mixing console with matrix outputs. Courtesy Allen and Heath.

LNc LN–= >@Sum L (^) N –LN