Biamp MA30 Original operating instructions

A: 9300 S.W. Gemini Drive Beaverton, OR 97008 USA T: +1 503.641.7287 W: www.biamp.com
PRODUCT DESCRIPTION
The MA30 and MA60 are half-rack, 30W or 60W
(respectively) single channel mixing amplifiers. Designed
for ease of use, the front panels of the MA30/MA60
include volume and microphone controls which provide
a visual indication of system operation. The MA30/MA60
is equipped with four priority levels for audio routing: one
emergency input, one paging input, one mic/line input, and
two stereo line, mono summed inputs.
MA30/MA60
Mixing Amplier
Installation & Operation Guide
FEATURES
• Single channel; 30/60 watts of continuous power
• Supports 4Ω and 70V/100V outputs
• Class D amplier topology
• Four priority levels for audio routing
• 24V priority output overrides local volume controls
• Dedicated emergency input with mute all switch
• Paging mic input with contact closure and chime
• One mic/line level input with 48V phantom power
• Two stereo inputs
• Fan-less operation
• Internal universal power supply
• Auto standby mode
• Rack mountable (2RU) with optional accessory
IMPORTANT SAFETY / COMPLIANCE
INFORMATION
• Do not exceed the ambient temperature of 0° - 35°C (32°-
95° F). Operating the unit beyond its normal limits may
cause overheating.
• This unit has not been designed for use in mobile
applications such as mobile discobars, mobile PA
systems, live bands or audio rental systems. Using it
in such application may damage products and increase
safety risks.
• This equipment is not suitable for use in locations where
children are likely to be present.
SETUP AND USE
This amplifier relies on convection cooling, so no fans are
installed. Make sure there is adequate airflow when installing
this device in a rack or other enclosed space.
The unit can be installed in a 19 inch rack system using the
included brackets, but the ventilation holes should never be
blocked. Allow at least one free rack space or approximately
1.7 inches (44 mm) above the amplifier. If necessary, use a
forced ventilation system if the rack holds multiple amplifiers.
The mains fuse is located in the mains inlet. It should be
replaced with a fuse of the same current and voltage rating:
• MA30: T 1 AL / 250 V
• MA60: T 1.6 AL / 250 V
Before using the amplifier for the first time, check the total
impedance of your speaker lines using an impedance meter.
Temporarily disconnect the speaker line from the amplifier
and measure the speaker line.
Minimum load impedance @ 100V must be 167 ohms or
more (MA60) or 333 ohms or more (MA30). These values
correspond to 60 and 30 watts @ 100V.

page 2 Installation and Operation Guide MA30/60
1. On / Standby Switch
Pushing this button puts the unit in an active or standby
state (the main power switch at the rear of the unit and
must be switched on) When the unit is powered on, the on/
standby button LED will light up steadily. Standby may be
disabled from the rear panel.
2. MIC On / O󰀨 Switch
Turns the microphone on or o󰀨.
3. Mic Volume Control Knob
Controls the microphone volume.
4. Name Field
Users may attached supplied naming stickers in this area.
5. Input 1 Selection Button
Press to select or deselect Input 1. Only one input can be
selected at a time.
6. Input 2 Selection Button
Press to select or deselect Input 2. Only one input can be
selected at a time.
7. Volume Control Knob
Controls the volume of Input 1 or 2 (whichever is selected)
8. Status LEDs
S/C (signal/clip)
• Green when a signal is present
• Red if the amplier is clipping
Protect
• Indicates an overload is occurring
• Amplier will mute until conditions normalize
Emergency
• Indicates an emergency message is playing
• All other contacts are muted
Paging
• Indicates if a paging contact or chime test button is
closed
Vox Mic
• Indicates the vox circuit (mic) is active.
2
6
3
1
5
7
4
MA30/MA60 FRONT PANEL
8
NOTE: the button for MIC and Input 1 or 2 may be
activated simultaneously. The volume of the MIC is
controlled by knob (3). The volume knob (7) does not
aect the output volume of the MIC. When the vox circuit
from MIC is enabled, MIC will attenuate the input 1-2
signal (30dB attenuation). The emergency input and
paging microphone levels and settings can only be set at
the rear panel (out of reach of an end user).
NOTE: MA30 shown; MA60 functions are identical

MA30/60 Installation and Operation Guide page 3
1. Emergency Input
Connect a balanced 0 dBV line level to the emergency
input. If available, connect the emergency contact at the
“mute all” connection. The contact must be “potential
free”, (i.e. a relay or switch contact that does not carry
any foreign voltage.) The emergency level can only be
set with the volume control. If the clip LED lights up
when the emergency signal is present, lower the level of
the emergency signal at the source to avoid distortion.
Activating the emergency input will also activate the priority
output (6).
2. Paging Mic Input
This input accepts microphone level signals on balanced
euroblock and line level signals on RCA. Adjust the gain
potentiometer so that the clip LED is not lit when the signal
is at its highest level. Set the volume control as desired.
When the paging contact is closed, all other sources
(except emergency input) will be muted and the chime will
sound. Set the chime level as desired. The paging contact
will also activate the priority output (6). Push the chime test
button to hear the level.
NOTE: the paging mic message will be muted as long as
the chime sounds (approximately two seconds), even if the
chime level is set to the minimum level (o.)
3. Mic
The euroblock input accepts balanced microphone or line
level signals. Set the mic/line switch accordingly. Phantom
power (48V) can be applied to the balanced euroblock by
pushing the phantom power switch (indicated by the LED).
Adjust the gain potentiometer so that the clip LED does not
light up when the signal is at its highest level. If necessary,
activate the vox circuitry by turning the vox potentiometer
until you hear an audible “click”. Then turn the vox
potentiometer up until the vox circuit is activated. The MIC
volume can be set using the front panel potentiometer (3).
MIC can be activated by pressing the MIC select switch
on the front panel (2). When activated, the vox circuit will
attenuate all lower priority sources (input 1-2) 30 dB. The
MIC input is compatible with the local input panel.
4. Input 1 & 2
Line level inputs for RCA connectors. Adjust the gain
potentiometer so that the clip LED does not light up when
the signal is at its highest level.
5. Speaker Out/Output EQ
Euroblock speaker output connector (4 ohm, 70V and
100V) Never use more than one output at the same time.
Use the Lo and Hi EQ potentiometer to adjust the sound
as desired.
6. Priority Out
Supplies 24 VDC, max 500 mA when priority is activated.
Priority will be activated by the emergency switch or
by the paging contact and the chime test button on the
paging mic input. Typically 24V priority is used to override
volume controllers present on speaker lines.
NOTE: do not use the priority output continuously at full
power (24V, 0.5A).
7. Auto standby
Enables/disables auto standby.
8. Pre Out
Carries the same line level signal being fed to the power
amplier, i.e. the signal level is determined by the position
of the master volume control.
9. Mains Inlet and Mains Power Switch
Mains power connection and power switch. Mains fuse is
also located here.
MA30/MA60 REAR PANEL
NOTE: MA30 shown; MA60 functions are identical
12 3 4 5
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9

page 4 Installation and Operation Guide MA30/60
INSTALLATION
Rack Mounting
Review Safety and Compliance and Setup and Use
sections on Page 1 of this document prior to installation.
The MA30/60 may be mounted in numerous configurations
based on preference and need. The MA3060-19 mounting
kit (sold separately) will allow the amplifier to be mounted
as follows:
Figure 1. Half-Rack Installation
Figure 2. Under-Counter Installation
Figure 3. Full-Rack Installation
Two MA30/60 units may also be connected via plates and
screws to fit in a single rack (19 inches wide).
Use the hardware as follows:
• Short screws: bottom connection plates
• Long screws: rack ears
• Use existing hardware on the amplifier for the rear
connection plates
Install the connection plates as follows:
1. Set the two amplifiers next to each other, bottom
facing up as shown in Figure 4.
2. Install the lower plates (two places) with four screws
each (eight screws total) as shown in Figure 5.
3. Install the back plates (two places) with two screws
each (four screws total) as shown in Figure 6.
Figure 4. Flip Units
Figure 5. Install Bottom Plates (2 places)
Figure 6. Install Back Plates (2 places)

MA30/60 Installation and Operation Guide page 5
INSTALLATION (CONTINUED)
4. Install the rack ears as shown in Figure 7.
Input Labels
Pre-printed and blank adhesive labels are provided with
the amplifier. Installers may adhere these labels to identify
functions as needed. See Figure 8.
Wiring & Connections
The following section provides common/practical examples
of wiring and connections.
Speakers
The example in Figure 9 shows a 100V speaker line
connection.
The 4 ohm and 70V connectors are not used. Connect
the common or speaker line ground wire to the COM
connector and the 100V
line to the 100V connector.
The minimum speaker
line impedance is 333
ohms (MA30) and 167
ohms (MA60). Check
the impedance with an
impedance meter before
connecting the speaker
line to the amplifier.
CAUTION: never use
more than one output
at a time and do not overload
the speaker output. In 70V
and 100V speaker lines, the power of all speakers in the chain
must be added. The total power MUST be lower than or equal to
the amplier’s output power.
For example: on a 240 watt 100 volt amplier, you can connect
4 x 60 watt 100 volt speakers in parallel: 4 x 60 = 240 watts.
Always measure the speaker line with an impedance meter or
speaker line watt meter.
Paging Mic
1. Make the connections as shown
in Figure 10. The + - GND is used
for the balanced signal of the
microphone. Black and yellow
are the paging contacts.Grey is
screen.
2. Close the paging contact (keep it
closed.)
3. See Figure 11. Turn the gain
control slowly clockwise while
speaking loudly into the mic
until the clip LED lights up at the
highest peaks. Turn the control
back slightly. Open the volume
control until the paging message sounds at the desired
volume through the connected speakers.
4. Open the paging contact
Figure 8. Labels
Figure 9. Speaker Connections
Figure 10. Paging Mic
Connections
Figure 7. Install Rack Ears
Figure 11. Adjust Gain & Volume

page 6 Installation and Operation Guide MA30/60
Wiring & Connections (Continued)
5. See Figure 12. Turn the
chime potentiometer
approximately halfway
and push the TEST button
to listen to the chime.
Adjust the volume from
the chime potentiometer
as required. Closing the
paging contact will also
activate the chime.
NOTE: the paging mic and
chime levels are independent
from the position of the large
volume control on the front of
the unit. The paging contacts
must be potential free, i.e. no
voltages should be present on
these connectors.
Input 1 & 2
1. Connect the output of the
line source to the RCA
connectors at Input 1 (or
2) as shown in Figure 13.
2. See Figure 14. While the
line source is playing,
turn the gain control
slowly clockwise until the
clip LED lights up at the
highest signal peaks. Turn
the back control back
slightly.
3. Select INPUT 1 (or 2) on the front panel. Increase the
volume (large volume control knob) on the front panel
to hear the selected source through the speaker(s).
NOTE: use the gain control to equalize the level differences
between sources. For example, if the CD player on Input 1
is louder than the radio on Input 2, adjust the gain control
of the CD player input slightly lower to compensate for
the difference in output level. When a stereo source is
connected, the signals of the left and right inputs will be
mixed to mono. A mono source may be connected on the L
or R channel RCA connector.
Figure 12. Paging Mic
Adjustments
Figure 13. Input Connections
Figure 14. Adjust Gain
Standby Function
The auto standby function can be enabled/disabled via the
switch at the rear of the unit (item 7, page 3). The power/
standby button LED will slowly fade in/out to indicate that
standby is activated.
There are two standby modes:
• Manual standby - activated by pushing the power button
on the front of the amplifier.
• Auto standby - activated via auto standby circuitry.
The amplifier will enter auto standby mode after 10 minutes
when:
• Auto standby is enabled.
• No audio signal is present on the selected input* or
when no input is selected.
• No emergency signal is present and the emergency
contact is not closed.
• The paging contact is not closed.
The amplifier will wake from auto standby mode when:
• The previously selected sound source is activated (i.e.
a signal is present on the previously selected input**).
• Any front button is pushed.
• A paging contact or chime test button is activated.
• The emergency input is activated by closing the
emergency switch.
• Power is cycled via the rear power switch or a mains
power interruption.
The amplifier will wake up from manual standby when:
• The standby / power button is pressed.
• The emergency input is activated by closing the
emergency switch.
• Power is cycled via the rear power switch or a mains
power interruption.
• Any front button is pushed.
*NOTE: Audio cable interference (noise) and/or an *NOTE: Audio cable interference (noise) and/or an
excessively long audio cable at the selected input mayexcessively long audio cable at the selected input may
prevent the unit from entering auto standby mode.prevent the unit from entering auto standby mode.
**The minimum required signal level required to wake up **The minimum required signal level required to wake up
the unit from auto standby is 2-10 mVrms for line inputs and the unit from auto standby is 2-10 mVrms for line inputs and
0.1-1 mVrms for microphone signals.0.1-1 mVrms for microphone signals.

MA30/60 Installation and Operation Guide page 7
Note: Every eort has been made to insure that the information
contained in this manual was complete and accurate at the time
of printing. However, due to ongoing technical advances, changes
or modications may have occurred that are not covered in this
manual. The latest version is available at www.biamp.com.
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