Page 1
MXA Series
Mixer/Amplifiers
Operation Manual
IMPORTANT SAFETY INSTRUCTIONS
1) Read these instructions.
2) Keep these instructions.
3) Heed all warnings.
4) Follow all instructions.
5) Do not use this apparatus near water.
6) Clean only with dry cloth.
7) Do not block any ventilation openings. Install in
accordance with the manufacturer’s instructions.
8) Do not install near any heat sources such as
radiators, heat registers, stoves, or other
apparatus (including amplifiers) that produce heat.
9) Do not defeat the safety purpose of the
polarized or grounding-type plug. A grounding
type plug has two blades and a third grounding
prong. The third prong is provided for your safety.
When the provided plug does not fit into your
outlet, consult an electrician for replacement of the
obsolete outlet.
10) Protect the power cord from being walked on
or pinched particularly at plugs, convenience
receptacles, and the point where they exit from the
apparatus.
11) Only use attachments/accessories specified by
the manufacturer.
12) Unplug this apparatus during lightning storms or
when unused for long periods of time.
13) Refer all servicing to qualified service
personnel. Servicing is required when the
apparatus has been damaged in any way, such as
power-supply cord or plug is damaged, liquid has
been spilled or objects have fallen into the
apparatus, the apparatus has been exposed to rain
or moisture, does not operate normally, or has been
dropped.
14) WARNING - To reduce the risk of fire or electric
shock, do not expose this apparatus to rain or
moisture.
15) The MAINS plug or appliance coupler is used
as the disconnect device. This disconnect device
must remain redily accessible after installation.
16) In order to comply with international safety
requirements for operating temperature, clearance
of at least 5cm or 1.97" must be maintained
between this device and other rack-mounted
devices. This spacing will ensure that all exposed
metal surfaces are safe to touch.
Explanation of safety related markings and symbols which appear on the outside of the apparatus.
Lightning Bolt
marked with this symbol while the unit is connected to live power.
Exclamation Point
manufacturer. Failure to do so will compromise safe operation of this unit.
Biamp Systems | 9300 S.W. Gemini Drive | Beaverton, OR | 97008 | USA | +1.503.641.7287 | www.biamp.com
: Hazardous Live voltages present when this unit is in operation. Do not touch terminals
: Replace components (i.e. fuses) only with the values specified by the
Page 2
Introduction
Front & Rear Panel Features
Installation Instructions
Specifications
Block Diagram
Warranty
TABLE OF CONTENTS
pg. 1
pgs. 2 & 3
pgs. 4 & 5
pg. 6
pg. 7
pg. 8
11Feb09
Page 3
MXA Series
INTRODUCTION
The MXA Series of mixer/amplifiers combines a versatile 6-input mic/line mixer with either 35, 75, 150, or 300 Watt amplification. Mixing
functions include mic/line/tel inputs, selectable automatic & manual channel muting, channel priority assignment, remote level control, tone
control, a built-in limiter, an internal chime, phantom power, MOH output, and extensive patching. The amplifier includes an output
transformer, and provides rated power into direct or distributed speaker systems. The MXA Series carries a five-year warranty.
MXA Series features include:
♦ integrated mixer, power amplifier, and output transformer
♦ six electronically balanced microphone/line input channels
♦ channel 1 selectable for 600 ohm transformer tel input
♦ rear panel trim & peak indicator on each input channel
♦ +48 Volt phantom power selectable on each input channel
♦ automatic muting of selected channels (-20dB or -80dB)
♦ automatic muting triggered by selected priority channels
♦ manual muting of selected channels (-20dB or -80dB)
♦ manual muting triggered from remote contact closures
♦ remote control of master level via rear panel terminals
♦ integral output limiter with rear panel threshold control
♦ recessed tone controls plus rear panel low-cut filter switch
♦ patch points for signal processing and systems interconnect
♦ Music On Hold output with independent level, from input 6
♦ 35, 75, 150, or 300 watts into direct or distributed systems
♦ front panel indicators for power, signal, peak, temp, & fault
♦ internal pre-announcement chime tone with level control
♦ input/output connections provided on barrier strip terminals
♦ covered by Biamp Systems' five-year warranty
♦ CE marked and UL / C-UL listed
♦ CCC Certified
1
Page 4
FRONT & REAR PANEL FEATURES
signal
on
On Indicator: This green LED remains lit when AC power is
applied to the unit.
Signal/Clip Indicator: This 2-color LED indicates the signal
level for the amplifier. When the LED is green, the amplifier has
signal (above -30dB). When the LED is red, the amplifier signal
is clipping (max. power). CAUTION: Signal levels should be
adjusted to avoid clipping. Clipping can cause distortion, overtemperature conditions, and even loudspeaker damage.
Temp/Fault Indicator (not present on model MXA35): This red
LED indicates over-temperature and output fault conditions for
the amplifier. When the LED remains lit, the amplifier has an
over-temperature condition. When the LED is flashing, the
amplifier has an output fault condition. Either condition will
temporarily de-activate the amplifier, causing the Signal/Peak
LED to turn off as well. The amplifier will attempt to self-reset
once the over-temperature or output fault condition is resolved.
BIAMP SYSTEMS
MXA300
U
C US
R
L
LISTED
52SJ
O
110-120/220-240V~ 50-60Hz 300W
FUSE: T 8A/4A L 250V 120V/240V
RoHS
Compliant
EU 2002/95/EC
mute/chime
F
U
E
S
S
E
U
F
min max
chime
level
AC Power Entrance: The switch applies power to the unit. The
receptacle accepts the detachable Power Cord. The Power Cord
is for connection to three-prong grounded outlets. CAUTION: Do
not remove or defeat the ground prong on the Power Cord, as this
constitutes a shock hazard. Equipment shall be connected to a
mains socket outlet with a protective earthing connection. Plug is
main disconnecting device and it shall remain readily operable.
Fuse: Replace Fuse with same type and value only. NOTE: If
the Fuse continues to blow, the amplifier may require service.
Power Selector Switch: This switch selects either 120 Volt or
240 Volt AC operation.
Output Connector: These screw terminals provide the speaker
outputs from the amplifier. CAUTION: To reduce the risk of
electric shock, do not perform any servicing unless you are
qualified to do so. Output connections must be made by qualified
service personnel only (refer to Installation Instructions on pg. 4).
temp
peak
fault
321456
Music
pre out
xfmr
input
EQ in
link
on
off
off
low cut
on
off
link
line out amp in
4Ω gnd
remote
Music On
level
Hold level
control
+10VC
120V
min
limiter
threshold
WARNING: RISK OF HAZARDOUS ENERGY.
class 3
wiring
On
Hold
max
output
maxmin max
min
auto mute
sensitivity
SEE INSTALLATION MANUAL.
Designed in Oregon, U.S.A.
70V100V 25V
com
Assembled in India
class 2 wiring
MXA300
0
0
+
treble
+
master
bass
NOTE: Signal/Peak indicators will turn off during Temp/Fault
conditions (see Signal/Peak & Temp/Fault Indicators above).
Level (Channels 1~6): These controls adjust the amount of
signal sent from the individual input channels to the mixer
output. Optimum Level setting is near the 12 o'clock position
(unity gain).
Level (Master): This control adjusts the amount of signal sent
from the mixer output to the amplifier input. The Master Level
control is used to adjust the overall volume of the system.
Bass: This screwdriver control adjusts the low-frequencies
("Bass") at the mixer output (±12dB @ 50Hz).
Treble: This screwdriver control adjusts the high-frequencies
("Treble") at the mixer output (±12dB @ 10kHz).
channel 6
phantom pwr
priority
auto mute
manual mute
-80dB
input
peak
min max
6
channel 5
phantom pwr
` on
priority
` on
auto mute
` on
manual mute
` on
-80dB
-20dB
trim
input
peak
min max
5
channel 4
phantom pwr
` on
priority
` on
auto mute
` on
manual mute
` on
-80dB
-20dB
trim
input
peak
min max
4
channel 3
phantom pwr
` on
priority
` on
auto mute
` on
manual mute
` on
-80dB
-20dB
trim
input
peak
min max
3
channel 2
phantom pwr
` on
priority
` on
auto mute
` on
manual mute
` on
-80dB
-20dB
trim
input
peak
min max
2
channel 1
phantom pwr
` on
priority
` on
auto mute
` on
manual mute
` on
-80dB
-20dB
trim
peak
min max
mic/line
tel
input
1
Chime Level: This control adjusts the volume level of a chime
tone (see Mute/Chime below). To turn the chime tone off
completely, set this control to the counter-clockwise position (min).
Limiter Threshold: This control adjusts the threshold level at
which the internal limiter circuit is activated. To turn the limiter off
completely, set this control to the clockwise position (max).
Auto Mute Sensitivity: This control adjusts the level at which
signals from "priority" channels will automatically trigger muting of
selected non-priority
channels (see DIP Switches on next page).
To increase auto mute sensitivity, turn this control clockwise.
Mute/Chime: This terminal (plus the adjacent
d
terminal) allows
manual muting of selected channels via an external switch or
contact closure (see DIP Switches on next page). When the
Chime Level control is turned up (on), a pre-announcement chime
tone will also be activated by the switch or contact closure.
` on
` on
` on
` on
-20dB
trim
2
Page 5
FRONT & REAR PANEL FEATURES
Remote Level Control: These two terminals (plus the adjacent
d
"
" terminal) provide remote volume control of the master level.
An internal voltage controlled amplifier (VCA) allows remote
control from up to 2000 feet away, using any 5k~50k
potentiometer and/or switch to provide adjustment and/or muting of
the master level. Potentiometers are wired with high-side to
(+10V), low-side to (
connect (C) to (
d)
, and wiper to (C). Mute switches simply
d
), with no (+10V) connection required.
Music On Hold Level: This control adjusts the volume level of a
Music On Hold output (see below). To turn the output off
completely, set this control to the counter-clockwise position (min).
Music On Hold Output: These three terminals provide a
balanced line-level output as a source for phone systems. This
signal is derived from input channel 6. For unbalanced output,
wire high to (+) and ground to (
d)
, leaving (-) unconnected.
Pre Out & EQ In: These two RCA jacks provide pre-tone patching
for external equipment. When used as an 'insert point' for external
signal processors, set the associated Link switch to the (off)
position. When using Pre Out for recording and/or EQ In for
stacking, the Link switch may remain in the (on) position.
Line Out & Amp In: These two RCA jacks provide post-master
patching for external equipment. When used as an 'insert point' for
external signal processors, set the associated Link switch to the
(off) position. When using Line Out for external amps and/or Amp
In for stacking, the Link switch may remain in the (on) position.
Low Cut: This switch controls a low-cut filter (12dB/octave @
125Hz) at the amplifier input. CAUTION: To avoid output fault
conditions, Low Cut must be used when driving 25/70/100 Volt
speaker systems (see Installation Instructions on pg. 4). Also, any
other system equalization affecting frequencies below 125Hz
should remain flat or be used as cut-only. This also precludes
boosting of the Bass control (see above) in these applications.
Ω linear taper
DIP Switches: The five DIP switches above each input are used
to assign specific functions to those individual channels. Phantom
Pwr assigns +48 Volts DC phantom power to the channel input, for
powering condenser microphones. CAUTION: To avoid damage
to equipment, assign phantom power only on channels being used
as inputs for conderser microphones. Priority
assigns a channel to
priority. When signal is present in a priority channel, any nonpriority channels which are assigned to Auto Mute will be muted by
their selected amounts (see below). NOTE: A priority channel
cannot be auto muted by another priority channel, but a priority
channel can be manually muted (see below). Auto Mute
assigns a
(non-priority) channel to be muted whenever signal is present in
any priority channel. Manual Mute
assigns a channel to be muted
whenever the Mute/Chime terminal is shorted to ground via a
switch or contact closure. Mute Level
assigns the amount of
muting (-80dB or -20dB) which is applied to a channel, when
triggered by either Auto Mute or Manual Mute. NOTE: -80dB is
effectively complete muting (off), whereas -20dB is audible
attenuation (ducking).
Peak: These red LEDs will light whenever channel signal levels
reach +10dB (8dB below clipping). Use this feature to aid in
proper adjustment of Trim (see below).
Trim: These screw-driver controls set the channel gain (0~60dB)
to compensate for different input signal levels (mic or line). Adjust
these controls so the channel Peak indictors flash only on
occasional peaks.
Mic/Line or Tel Switch (Channel 1 only): This switch selects the
proper impedance and gain for either mic/line input signals or input
from 600 ohm sources. The input for Channel 1 includes an
isolation transformer, which allows connection to most telephone
system audio ports.
Inputs: These plug-in barrier strips provide a balanced input
connection for each channel. For unbalanced input, wire high to
(+) and ground to both (-) & (
d
). The input for Channel 1 includes
an isolation transformer.
3
Page 6
INSTALLATION INSTRUCTIONS
C US
CAUTION: These Installation Instructions are for use by qualified service personnel only. To reduce the risk of electric shock, do not
perform any servicing unless you are qualified to do so.
Output Connector: These seven screw terminals provide the speaker outputs from the amplifier. From the factory, a jumper wire is
installed from the 4
com terminal, and connect speaker positive to the appropriate transformer output terminal (25V for a 25 Volt distributed speaker system;
70V for a 70 Volt distributed speaker system; 100V for a 100 Volt distributed speaker system). For direct amplifier output, first remove the
factory installed jumper wire, then connect speaker negative to the gnd terminal, and connect speaker positive to the 4
CAUTION: The 100V output requires Class 3 wiring. Please refer to a qualified electrician.
CAUTION: To avoid output fault conditions, Low Cut must be used when driving 25/70/100 Volt speaker systems (see Front & Rear Panel
Features on pg. 3). Also, any other system equalization affecting frequencies below 125Hz should remain flat or be used as cut-only. This
also precludes boosting of the Bass control in these applications.
Speaker Output Connections:
1) M4 ring lugs (9mm) supplied as accessories with this product must be used to connect speaker wires to the amplifier output screw
terminals. This will prevent the wires from accidentally disconnecting from the screw terminals. The ring lugs will accept 14~20 AWG wire.
For proper wiring and insulation of ring lugs, in particular for 100V output, see Figures #1 & #2 on next page .
2) 'P' Clip supplied as an accessory with this product must be used to route the speaker wires.
3) For installation of the 'P' Clip refer to Figure #3 below.
BIAMP SYSTEMS
MXA300
U
R
LISTED
52SJ
L
RoHS
Compliant
EU 2002/95/EC
O
110-120/220-240V~ 50-60Hz 300W
FUSE: T 8A/4A L 250V 120V/240V
channel 1
phantom pwr
mic/line
auto mute
manual mute
tel
on
priority
on
on
on
-80dB
-20dB
peak
trim
min max
input
1
on
on
on
on
-20dB
trim
mute/chime
F
U
E
S
S
E
U
F
min max
chime
level
Music
pre out
line out amp in
xfmr
input
off
low cut
off
4Ω gnd
EQ in
link
on
off
on
link
remote
Music On
level
Hold level
control
+10VC
120V
limiter
threshold
class 3
wiring
min
max
70V100V 25V
class 2 wiring
min
auto mute
sensitivity
On
Hold
output
maxmin max
com
channel 6
phantom pwr
priority
auto mute
manual mute
-80dB
input
peak
min max
6
channel 5
phantom pwr
on
priority
on
auto mute
on
manual mute
on
-80dB
-20dB
trim
input
peak
min max
5
channel 4
phantom pwr
on
priority
on
auto mute
on
manual mute
on
-80dB
-20dB
trim
input
peak
min max
4
channel 3
phantom pwr
on
priority
on
auto mute
on
manual mute
on
-80dB
-20dB
trim
input
peak
min max
3
channel 2
phantom pwr
on
priority
on
auto mute
on
manual mute
on
-80dB
-20dB
trim
input
peak
min max
2
Ω terminal (direct output) to the xfmr input terminal. For transformer (xfmr) output, connect speaker negative to the
Ω terminal.
4
Page 7
INSTALLATION INSTRUCTIONS
100 VOLT DISTRIBUTED INSTALLATIONS
MXA 35, 75, 150, 300 AMPLIFIERS
A minor modification for wiring 100V installations is required to comply with safety regulations.
Instructions
On any installation using the 100 volt output tap, insulation must be applied to the supplied ring lug terminals. This insulation is to prevent
unintentional contact with the energized 100 volt tap. Please perform the following steps.
1) Remove mains power from the unit to be serviced.
2) Remove the safety cover from the output barrier strip.
3) Remove the barrier terminal screws for the 100 volt tap and Com connections.
4) Strip 0.25” (6.4mm) of insulation from each lead.
5) Slide one piece of the supplied heat shrink tubing on to each wire.
6) Crimp the ring lug terminals on to the prepared wires. See Figure #1.
7) Slide the heat shrink as far onto the shank of the ring terminal as possible.
8) Apply a heat source such as a heat gun or match to the heat shrink tubing until it shrinks onto the lug/wire.
9) Reassemble the lugs and screws to the 100 volt tap and Com connections. Tighten the screws securely.
10) Replace the safety cover and screws.
This completes the safety modification.
:
as provided
M4 ring lugs
crimped to wire
Figure #1
with heat shrink
tubing added
P-Clip
class 3
wiring
70V100V 25V
class 2 wiring
Figure #2
com xfmr
input
4Ω gnd
5
Page 8
SPECIFICATIONS
6
Page 9
BLOCK DIAGRAM
7
Page 10
WARRANTY
BIAMP SYSTEMS IS PLEASED TO EXTEND THE FOLLOWING 5-YEAR LIMITED WARRANTY TO THE
ORIGINAL PURCHASER OF THE PROFESSIONAL SOUND EQUIPMENT DESCRIBED IN THIS MANUAL
1. BIAMP Systems warrants to the original purchaser of new
products that the product will be free from defects in material
and workmanship for a period of 5 YEARS from the date of
purchase from an authorized BIAMP Systems dealer, subject to
the terms and conditions set forth below.
2. If you notify BIAMP during the warranty period that a BIAMP
Systems product fails to comply with the warranty, BIAMP
Systems will repair or replace, at BIAMP Systems' option, the
nonconforming product. As a condition to receiving the benefits
of this warranty, you must provide BIAMP Systems with
documentation that establishes that you were the original
purchaser of the products. Such evidence may consist of your
sales receipt from an authorized BIAMP Systems dealer.
Transportation and insurance charges to and from the BIAMP
Systems factory for warranty service shall be your responsibility.
3. This warranty will be VOID if the serial number has been
removed or defaced; or if the product has been altered,
subjected to damage, abuse or rental usage, repaired by any
person not authorized by BIAMP Systems to make repairs; or
installed in any manner that does not comply with BIAMP
Systems' recommendations.
4. Electro-mechanical fans, electrolytic capacitors, and normal
wear and tear of items such as paint, knobs, handles, and
covers are not covered under this warranty.
Biamp Systems
9300 S.W. Gemini Drive
Beaverton, Oregon 97008
(503) 641-7287
5. THIS WARRANTY IS IN LIEU OF ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED. BIAMP SYSTEMS
DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR
IMPLIED, INCLUDING, BUT NOT LIMITED TO, IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE.
6. The remedies set forth herein shall be the purchaser's sole
and exclusive remedies with respect to any defective product.
7. No agent, employee, distributor or dealer of Biamp Systems
is authorized to modify this warranty or to make additional
warranties on behalf of Biamp Systems. statements,
representations or warranties made by any dealer do not
constitute warranties by Biamp Systems. Biamp Systems shall
not be responsible or liable for any statement, representation or
warranty made by any dealer or other person.
8. No action for breach of this warranty may be commenced
more than one year after the expiration of this warranty.
9. BIAMP SYSTEMS SHALL NOT BE LIABLE FOR SPECIAL,
INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
INCLUDING LOST PROFITS OR LOSS OF USE ARISING
OUT OF THE PURCHASE, SALE, OR USE OF THE
PRODUCTS, EVEN IF BIAMP SYSTEMS WAS ADVISED OF
THE POSSIBILITY OF SUCH DAMAGES.
585.0188.90B
8
Page 11
DoC MXA201003
EC Declaration of Conformity
Biamp Systems Corporation, as manufacturer having sole responsibility, hereby
declares that the following described product complies with the applicable provisions of
the DIRECTIVES below except as noted herein. Any alterations to the product not
agreed upon and directed by Biamp Systems Corporation will invalidate this declaration.
Product Models: MXA35, MXA75, MXA150, MXA300
Product Description: Audio Mixing Amplifiers
Applicable EC Directives: Applicable Harmonized Standards:
LVD Directive (2006/95/EC) Safety EN 60065:2002
EMC Directive (2004/108/EC) Emissions EN 55103-1:1996, Environment E2
Immunity EN 55103-2:1996
Special Considerations for Product Environment or Compliance:
Shielded cabling must be used for system connections.
Technical Documentation File, Location and Contact:
Biamp Systems, Inc. phone: (503) 641.7287
9300 S.W. Gemini Drive fax: (503) 626.0281
Beaverton, OR USA 97008 e-mail: biamp@biamp.com
Authorized Representative: Larry Copley, Compliance Engineer
Authorized Signature:
Issued: March, 2010
Page 12
EU RoHS COMPLIANT
This Biamp product, including all attendant cables and accessories
supplied by Biamp, meets all requirements of EU Directives
2002/95/EC of January 27, 2003, and 2005/618/EC of August 18,
2005, the EU RoHS Directives. An EU RoHS Materials Content
(This information is presented to comply with the requirements of Chinese law SJ/T11363-2006)
部件名称 (Part Name)
设备机箱 (Equipment Chassis)
电源线 (Power Cord)
插拔式接线端子 (Plug-in Terminal Blocks)
手册和其他书面文档 (Manual and Paper Documents)
包装箱和所有包装材料 (Box and Packing Materials)
0：表示该部件所有均质材料中的这种有毒有害物质低于 SJ/T11363-2006 的限制要求.
Declaration document may be obtained at www.biamp.com
有害物质表 (Hazardous Substances Table)
Biamp Systems Corporation
音频放大器 (Audio Amplifier)
MXA-35, MXA-75, MXA-150, MXA-300
有毒有害物质或元素 (Substances)
Pb 铅 Hg
汞
Cd
镉
Cr+6
六价铬
X O X O O O
O O O O O O
O O O O O O
O O O O O O
O O O O O O
PBB PBDE
X：表示该部件中至少有一种均质材料所含的这种有毒有害物质高于 SJ/T11363-2006 的限制要求.
在电触头和（或）镀镉所含的均质材料中，镉及其化合物的含量可以超过 0.01%，但欧盟指令 91/338/EEC（根据欧盟指令
76/769/EEC）限制销售和使用某些危险物质和制剂部分中所禁止的用途除外
在以下一种或多种物质所含的均质材料中，铅及其化合物的含量可以超过 0.1%:
1) 电子元器件中玻璃内所含的铅
2) 铅在钢材中是作为一种合金元素，含量可达 0.35%
3) 铅在铝材中是作为一种合金元素，含量可达 0.4%
4) 铅在铜材中是作为一种合金元素，含量可达 4%
5) 高熔点类焊料中的铅（即铅料合金，铅含量超过 85%）
6) 电子陶瓷部件内的铅
7) 由两种以上元素组成的焊料中所含的铅，用于连接针脚和微处理器包装，其中
铅的含量超过 80% 但低于 85%
8) 顺应针连接系统内的铅
9) 倒装芯片封装中半导体芯片及载体之间形成可靠连接所用焊料中的
在正常使用情况下，中国环保使用期限为 10 年，条件是：
• 环境温度为 0-40C (32-104°F)
• 湿度为 0-95%，无凝结
• 海拔高度为 0-10,000 英尺
• 气流不受阻碍
• 没有水或其他液体进入任何部件
• 电源为 110/220V~, 50/60Hz
• 部件没有损坏（损坏部件应立即修理）
• 由工厂授
权人员
使用批准的材料进行所有
维
修
10
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