User Manual

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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.

PAGE ONE

Summary of content (8 pages)

PAGE 1
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.
PAGE 2
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.
PAGE 3
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.
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BASIC OPERATIONS: The MixMaster 20 has a fairly long turn-on sequence, about 30 seconds. The logic circuitry powers up first and stabilizes, then the middle voltages that power the summing input channels (5-20) and the monitor section stabilize, then the long slow ramp of power for input channels 1 to 4 and the mix and fader amplifiers stabilizes. This power also lights the meters, so when they come on the unit is ready to go.
PAGE 5
BASIC OPERATIONS: (Continued) transformer coupled on both the input and outputs. The maximum signal level at the output is +29dBu. The input impedance of the fader amplifier is about 50K ohms, enough to not load any professional equipment used in the patch loop. The send for the stereo patch loop is the output of the main mixing amplifier. This is also fully transformer coupled, and also has a maximum output level of +29dBu. The Talkback level knob controls the amount of talkback signal in the cue output.
PAGE 6
BASIC OPERATIONS: (Continued) To set pan position, reselect the channel, then instead of pressing LEVEL, press PAN, rotate SELECT to put the signal in the desired position (indicated by the green and single center red LEDs), then press and hold SAVE and the SELECT knob again. You can select multiple channels and assign levels, then go back and pick the odd numbered ones in the group and set pans to the left, reselect the evens, set pans to the right without altering the levels previously set.
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BASIC OPERATIONS: (Continued) Channels One thru Four These channels are transformer coupled in and out, have a maximum direct output level of +29dBu, and have both mic and line inputs. The microphone preamp is a transformer coupled high gain low noise design that will accept up to a +15dBu microphone signal. Phantom power is applied with the +48 button in. Set the desired preamplifier gain with the MIC GAIN pot.
PAGE 8
BASIC OPERATIONS: (Continued) The application program. This is a simple program that stores the important mixer settings and a number of text notes that can be saved with other session files to make recreating a mix much easier. Simply connect the computer to the mixer with the USB cable, communications will be established and indicated by the green “LED” on the program’s graphic display.