Mackie SR40.8 Service Manual - System Overview

5

SYSTEM OVERVIEW

THE SR40•8 IN A NUTSHELL

This section provides a quick summary of the SR40•8’s major features. It is not intended

to take the place of the owner’s manual.  It is included here to help servicing

technicians familiarize themselves with the SR40•8.

MIXING

Channel controls manipulate mic/line signals in this order: phantom power, trim,

polarity, low cut filter, insert, EQ, mute, fader, pan, and assignment switches. These

signals are then assigned to the left, right and/or center mix, or to one of the eight

subgroups.

The main mix (left, right and center) typically feeds the main sound system. The left/right

mix can be controlled by individual faders or switched to share one fader. Subs 1-8 can

be assigned to the left/right or center mix, enabling them to be used as master faders

for submixes of channels. Alternatively, the subs can be used for secondary speaker

systems. More output routing options involve the matrix, discussed below.

MATRIX

The SR40•8 has 11 primary mix buses: left, right, center, and 8 subs. Via the channel’s

assignment switching, signals can be distributed among these buses. If a situation

demands a unique destination for each mix, the dedicated outputs for each of these

mixes will suffice.

More likely, a situation will demand that these 11 mixes be recombined in some way, to

feed off-site systems, delay towers, assistive listening systems, or special mixes for

recording or broadcast. Enter the Matrix.

The matrix is simply four separate 12 x 1 mixers. Its inputs include: left, right, center, subs

1-8 and an external input at the patch panel. Each matrix strip has a level control for

each of the eleven internal inputs as well as master level, solo and mute controls.