Mach 1 Acoustics 8-BUS-TB-4 Owners manual
Mackie 8 bus
Installation instructions for the Brainstorm TB-4 Communicator
The talkback switches on the Mackie 8-Bus have two poles: one mutes the monitors and the other routes the mic to
the talkback destination. You need to use 2 of the TB-4 relays to remote these switches, one for each pole.
To remote one Mackie TB switch only, connect the
TB-4 receiver relays 1 & 2 (Headphones &
SW77
T/B2AUX1
Speakers) to each pole of the Mackie TB switch and
set the TB-4 transmitter's selector switch to position 2
(arrows). In this position, the receiver's relays 1 & 2
are activated simultaneously.
To remote two switches on the Mackie, first modify
your TB-4 receiver so that whenever relays 1 or 2
are activated, relay 3 is also activated ( ask your
dealer for a copy of TBR-4 Mod 1). Relay 1 will
route the mic to destination 1, relay 2 will route it to
MIC
SW78
SW61
SW79
T/B2AUX2
MUTE
T/B2SUBGROUPS
T/B2PHONES + STUDIO
N.C.
TBR-4 Relays
3
2
1
3
2
1
3
2
1
2
1
3
destination 2 and relay 3 will mute the monitors. You
can then select switch 1, switch 2, or both
Schematic Diagram for 2 TB switches
simultaneously on the transmitter.
The schematic diagram above illustrates the connections required for remoting the “Headphone + Studio” and
“Subgroup” (Slate) switches. Cut the 2 traces where indicated (“X”) and solder the wires. Since the wires carry line
level audio (TB-mic) , use a shielded cable to avoid hum.
Installation
1. All the work can be done from bottom side. Turn console face down. Do not remove screws or knobs on top side. To
remove the bottom cover:
a. remove side covers (3 large screws)
b. remove top & bottom row of screws (about 10)
c. remove side small screws (3 or 4 per side) - reinstall these first upon re-assembly
2. Locate the feedthru holes indicated on drawing at
right (use a continuity tester to make sure you found
the right one).
3. Cut the traces where needed: for SW79 (phones &
studio) cut at “1”; for SW61 (Slate), cut at “3” (see
drawing at right)
4. Use a punch to enlarge the small MIDI plastic
plugged rear panel hole near the power entry
connector.
2
SW77
Feedthru hole
SW78
To relay2 pin3
SW61
MADE IN U.S.A.
SW79
Mackie 8 bus Communication module - Foil side
(dotted lines represent traces on components side - solid lines, on foil side)
To relay2 pin1
To relay3 pin2
To relay3 pin1
To cable shield
To relay1 pin3
To relay1 pin1
1
To relay1 pin2
Feedthru hole
3
4
To relay2 pin2
5. Install an 8 pin DIN panel connector (rear mount). The two screw holes may have to be filed open larger to make a
clearance for the mounting screws.
6. Make the connections between the TB circuitry and the DIN connector: solder wires (5 or 8) and shield to the switch
pads as indicated above and to pads “2” and “4” (if needed); solder the other ends to the DIN connector.
7. Make a cable to connect the TB-4 receiver screw terminals to the DIN connector; 5 wires for “Studio” only. Add 3
more wires for second function (i.e. Group Talkback). If necessary, the cable can be fairly long. We've run it over 30
feet with no problem. Recomended: 5 wire shielded flexible cable - Mogami 2002.
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