Great River Electronics MIXMASTER 20 User Manual

Great River MixMaster 20

Preliminary Manual

INITIAL CONNECTIONS:

Caution: DO NOT CONNECT AC TO THE POWER SUPPLY BEFORE THE SUPPLY IS
CONNECTED TO THE MIXER!!!

Connect the mixer and power supply with the supplied cable. This cable is the
same on either end, and is keyed so it will only go in the mating connector one
way. Be sure the ring is turned down, about three-quarters of a turn, you will feel
it lock. Do this at both the mixer and power supply end of the cable.

Choose a good location for the supply, with convenient access to the power
switch, but not too close to any audio cables. Give at least 6 inches of clearance
between audio cables and the supply.

Microphone inputs are standard female XLR’s, wired pin 2 hot. Phantom power is
switched on an individual channel basis on the front panel.

The mixer can be connected to your computer via the USB connector on the rear
panel. This allows the simple mixer memory application to be used. This
application is supplied in both Windows and Mac versions.

The remote talkback jack is a ¼” TS phone jack for connecting a foot switch.
Connecting tip to sleeve activates the talkback function, releasing the connection
de-activates talkback.

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INITIAL CONNECTIONS: (Continued)

All other connections to the mixer are via DB-25 connections, wired in the Tascam

wiring standard.

DB-25 Connector # 1

This connector has inputs One thru Eight, in order.

DB-25 Connector #2

This connector has inputs Nine thru Sixteen, in order

DB-25 Connector #3

This connector has inputs Seventeen thru Twenty, in order in positions 1 thru 4
and in position 7 and 8 are Tape Returns Left and Right.

DB-25 Connector #4

This connector has Patch Sends for input channels 1-4 wired in positions 1 thru 4
and Patch Sends for the Stereo Mix Left and Right in positions 5 and 6.

DB-25 Connector #5

This connector has Patch Returns for input channels 1-4 wired in positions 1 thru
4 and Patch Returns for the Stereo Mix Left and Right in positions 5 and 6.

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INITIAL CONNECTIONS: (Continued)

DB-25 Connector # 6

This connector has the Direct Outputs of input channels 1-4 on positions 1 thru 4
and Auxilliary Mix Outs 1 thru 4 on positions 5 thru 8.

DB-25 Connector #7

This connector has the Stereo Mix Left and Right Outputs on positions 1 and 2,
Cue Out Left and Right on positions 3 and 4, Speaker A Out Left and Right on
positions 5 and 6, and Speaker B Out Left and Right on positions 7 and 8.

All connections in the DB-25 pin connectors are balanced +4dBu signals and must
have both the hot and cold connections made to operate correctly. They may be
unbalanced by connecting the cold line to ground, which is not recommended but
not illegal.

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