MXA333 Audio Type
The Alpha Communications®/S.T.R.™ MXA333
intelligent mixer is used only with the QwikBUS™
series intercom systems for systems with more than
100 addressable QwikBUS™ stations. The
MXA333 provides the intelligent circuitry needed
to install multiples of 100 QwikBUS™ stations,
allowing systems with very large system capacities.
Each MXA333 gets its power from its associated
SP333 intelligent controller and corresponding
SNT333 power supply. All MXA333 field con-
nections are positive screw terminal type, or plug-
in type. Each MXA333 requires the SP333 and
SNT333, and C333-2 connecting cable assembly.
• Easily Installs Right on Finished Wall Surface or in
Optional Junction Box
• Operates on Safe Low-Voltage Class II Wiring
• Positive Screw Terminal and Plug-in Connectors
Height: 3.75" (96mm)
Width: 4.25" (108mm)
2.375" (61mm) from mounting
Construction: High impact Grey ABS plastic case
Positive screw terminal and plug-in
0-50 degrees C.
Surface-mounted (usually installed near
the system amplifier/power supply and
other system central equipment).
Rev. 1 - 07/09
ARCHITECTS' AND ENGINEERS'
The intelligent audio mixer(s) shall be Alpha Com-
munications®/S.T.R.™ QwikBUS™ model
MXA333, or approved equal. The MXA333 shall be
built into a rugged high impact ABS plastic case, and
shall be used with the associated SP333 intelligent
controller (and associated SNT333 power supply)
for up to 100 QwikBUS™ audio stations (25 per line
maximum). Contractor shall furnish the proper num-
ber of MXA333 and SP333 units, depending upon
Low voltage wiring shall be used and positive screw
terminal and plug-in connectors shall be provided for
installation wiring. The MXA333 shall be mountable
right to the surface of the wall or in a customer-
supplied junction box cabinet.
Contractor shall observe all local and national elec