B-52 ACTPRO12M User manual

B-52 ACTPRO Active Systems - Instruction Manual
THE BEAUTY OF POWER ACTPRO
INSTRUCTION MANUAL
ACTPRO
PROFESSIONAL ACTIVE SYSTEMS
PRO
ACTPRO12M
12” Two-Way Active Loudspeaker
ACTPRO15
15” Two-Way Active Loudspeaker
ACTPRO1515
Dual 15” Two-Way Active Loudspeaker
ACTPRO18S
18” Active Subwoofer

THE BEAUTY OF POWER
B-52 ACTPRO Active Systems - Instruction Manual
ACTPRO
CONTENTS
Introduction ................................................... 3
Safety information.......................................... 4
Features........................................................ 5
How the ACTPRO should be used .................... 6-7
Installation..................................................... 8
Rear Panel Controls........................................ 9-13
Connections .................................................. 14-18
Specifications ................................................ 19
Warranty ...................................................... 20
Contact Information........................................ 20
2
1) Read and keep these instructions for reference.
2) Follow all instructions.
3) Heed all warnings.
4) DO NOT turn on the ACTPRO amplifier before
connecting all other external devices.
5) Do not use the speaker system near water. Be extra
cautious when moving the speaker system during
rainstorms or while transporting it over wet surfaces,
as water may splash onto the speaker system.
6) Clean only with dry cloth.
7) Do not block any ventilation openings and operate
in accordance with manufacturer’s instructions.
8) Do not install near heat sources such as radiators,
stoves or other devices that may produce heat.
9) Do not defeat the safety purpose of the polariza-
tion or grounding-type plug. A polarized plug has two
blades, one blade wider than the other. A grounding-
type plug has two blades and a third grounding
prong. The wide blade, or the third prong, is pro-
vided for your safety. If the provided plug does not fit
your outlet, consult an electrician for replacement of
the obsolete outlet.
10) Protect the power cord from being walked on or
pinched, particularly at the plug, and the point where
it exits the amplifier.
11) Only use attachments / accessories specified by
B-52 Professional.
12) Unplug the amplifier before lightning storms and
when not in use.
13) Refer all servicing to qualified personnel. Servic-
ing may be required when the speaker system has
been damaged in any way such as: when power-cord
or plug is damaged, liquid has been spilled into the
speaker system, the speaker system has been exposed
to moisture or rain, does not operate normally, or has
been dropped.
14) Moisture can damage the ACTPRO amplifier and
cause corrosion of electrical contacts.
15) Keep the speaker system out of extended or
intense direct sun light. Containers filled with
any type of liquid should not be placed on or near the
speaker system.
16) Do not remove rear amplifier panel.
There are no user serviceable parts inside.
SAFETY AT A GLANCE

B-52 ACTPRO Active Systems - Instruction Manual
THE BEAUTY OF POWER ACTPRO
WELCOME TO THE B-52 FAMILY
CONGRATULATIONS ON YOUR PURCHASE OF THE ACTPRO SPEAKER SYSTEM.
Please review all the information provided in this manual, to ensure that you attain the best pos-
sible sound quality out of your system.
The ACTPRO Series full-range powered loudspeakers are capable of producing rich,
clear sound at extreme SPLs. The amplifiers used in ACTPRO powered loudspeakers employ
sophisticated circuitry including acoustically tuned 4th order crossovers, four stages of equal-
ization, a built-in compressor/limiter and short circuit/over-current protection. ACTPRO Series
amplifiers have an extra high current output stage, which sets it apart from the competition,
allowing for uninterrupted extended play. All ACTPRO amplifiers are Bi-Amps with fully discrete
output stages; low frequency amplifiers employ our proprietary class G topology for high ef-
ficiency and low power consumption.
Our new ACTPRO18S subwoofer is the ultimate solution for low frequency sound rein-
forcement. These innovative active subs deliver deep, rich, chest pounding bass. At the heart of
the ACTPRO subwoofer is our proprietary class G amplifier.
ACTPRO speakers feature a rugged birch plywood construction and durable, black
WarneckeTM paint finish that ensures that the cabinets look as great as they sound. The ACT-
PRO amplifiers provide LED indicators for power, signal presence, limiter activation and protec-
tion mode. In addition to rear indicators a blue LED power indicator is provided on the front
grille of the cabinet.
3
HEARING DAMAGE AND PROLONGED EXPOSURE TO EXCESSIVE SPLs
B-52 speakers can produce sound levels high enough to cause permanent hearing damage to per-
formers, production crews or people in the audience. Hearing protection devices are recommended
for use where long-term exposure to high SPLs is not avoidable. Remember, if it hurts, it is definitely
too loud! Long exposures to high SPLs cause first temporary threshold shifts, limiting your ability to
hear the actual loudness and exercise good judgment. Repeated long term exposure to high SPLs
can and WILL CAUSE PERMANENT HEARING LOSSES!
Please note the recommended exposure limits (right) in Table G-16.
More information about these limits is available on the US
Government Occupational Safety and Health (OSHA)
website at: www.osha.gov

THE BEAUTY OF POWER
B-52 ACTPRO Active Systems - Instruction Manual
ACTPRO
1. READ INSTRUCTIONS – All the safety and
operating instructions should be read before this
product is operated.
2. RETAIN INSTRUCTIONS – The safety and
operating instructions should be retained for future
reference.
3. HEED WARNINGS – All warnings on the
amplifier and in the operating instructions should be
adhered to.
4. FOLLOW INSTRUCTIONS – All operating and
use instructions should be followed.
5. WATER AND MOISTURE – The speaker system
should not be used near water - for example, a
bathtub, washbowl, kitchen sink, laundry tub, wet
basement, or near a swimming pool, and the like.
6. CARTS AND STANDS – The speaker system
should be used only with a cart or stand that is recom-
mended by the manufacturer.
A speaker and cart combination
should be moved with care. Quick
stops, excessive force, and uneven
surfaces may cause the speaker
and cart combination to overturn.
7. WALL OR CEILING MOUNTING – The product
should never be mounted to a wall or ceiling.
8. HEAT – The amplifier on the back of the ACTPRO
system should be situated away from heat sources such
as radiators, heat registers, stoves, or other sources
(including amplifiers) that produce heat.
9. POWER SOURCES – This product should be
operated only from the type of power source indicated
on the rating label. If you are not sure of the type
of power supply to your home, consult your product
dealer or local power company.
10. GROUNDING OR POLARIZATION – This
product may be equipped with a polarized alternation-
current line plug (a plug having one blade wider than
the other). This plug will fit into the power outlet only
one way. This is a safety feature. If you are unable to
insert the plug fully into the outlet, try reversing the
plug. If the plug should still fail to fit, contact your
electrician to replace your obsolete outlet. Do not
defeat the safety purpose of the polarized plug.
11. POWER-CORD PROTECTION – Power-supply
cords should be routed so that they are not likely to be
walked on or pinched by items placed upon or against
them, paying particular attention to the cord in cor-
respondence of plugs, convenience receptacles, and the
point where they exit from the amplifier.
12. CLEANING – The speaker and amplifier should
be cleaned only as recommended by the manufacturer.
Clean by wiping with a cloth slightly damp with water.
Avoid getting water inside the speaker or amplifier.
14. NON-USE PERIODS – The power cord of the
amplifier should be unplugged from the outlet when
left unused for a long period of time.
15. OBJECT AND LIQUID ENTRY – Care should
be taken so that objects do not fall and liquids are not
spilled into the enclosure through openings.
16. DAMAGE REQUIRING SERVICE – The
amplifier should be serviced by qualified service
personnel when:
A. The power-supply cord or the plug has been
damaged; or
B. Objects have fallen, or liquid has been spilled
into the amplifier; or
C. The amplifier has been exposed to rain; or
D. The amplifier does not appear to operate
normally or exhibits a marked change in
performance; or
E. The amplifier has been dropped, or the enclosure
damaged.
17. SERVICING – The user should not attempt any
service to the speaker and/or amplifier beyond that
described in the operating instructions. All other servic-
ing should be referred to qualified service personnel.
18. VENTILATION – Slots and openings in the
amplifier are provided for ventilation and to ensure
reliable operation of the product and to protect it from
overheating. These openings must not be blocked
or covered. The openings should never be blocked
by placing the product on a bed, sofa, rug, or other
similar surface. This product should not be placed in a
built-in installation such as a bookcase or rack.
19. ATTACHMENTS – do not use attachments not
recommended by the product manufacturer as they
may cause hazards.
20. ACCESSORIES – Do not place this product on
an unstable cart, stand, tripod, bracket, or table. The
product may fall, causing serious injury to a child or
adult, and serious damage to the product. Use only
with a cart, stand, tripod, bracket, or table recom-
mended by the manufacturer, or sold with the product.
21. LIGHTNING – For added protection for this
product before a lightning storm, or when it is left un-
attended and unused for long periods of time, unplug
it from the wall outlet. This will prevent damage to the
product due to lightning and power-line surges.
22. REPLACEMENT PARTS – When replacement
parts are required, be sure the service technician has
used replacement parts specified by the manufacturer
or have the same characteristics as the original part.
Unauthorized substitutions may result in fire, electric
shock, or other hazards.
23. SAFETY CHECK – Upon completion of any
service or repairs to this product, ask the service
technician to perform safety checks to determine that
the product is in proper operating condition.
24. FUSES – Always use the correct rating and type
of fuse as indicated on the rear panel of the amplifier.
Note the proper rating fuse is determined by the AC
line voltage in the country this speaker system is being
operated. COMPLETELY DISCONNECT POWER CORD
FROM AMPLIFIER BEFORE ATTEMPTING TO REPLACE
FUSE!
25. AC SELECT SWITCH: This switch must be set to
match the AC line voltage in the country this speaker
system is being operated. To change the setting, loosen
(do not remove) the two screws above and below the
slide switch. Temporarily move the protective cover
strip and slide the actuator to match the voltage in
your country. Place the protective cover strip back over
the switch and tighten the two screws. COMPLETELY
DISCONNECT POWER CORD FROM AMPLIFIER BEFORE
ATTEMPTING TO CHANGE AC VOLTAGE SETTINGS!
IMPORTANT SAFETY PRECAUTIONS
CAUTION: To reduce the risk of electric shock, do not
remove any cover. No user-serviceable parts inside. Refer
servicing to qualified service personnel only.
The lightning flash with arrowhead symbol within the equilateral triangle is intended to alert the use to the
presence of un-insulated “dangerous voltage” within the product’s enclosure that may be of sufficient
magnitude to constitute a risk of electric shock.
The exclamation point within the equilateral triangle is intended to alert the user to the presence of important
operation and maintenance (servicing) instructions in the literature accompanying this appliance.
To prevent electric shock, do not use a polarized plug with an extension cord, receptacle or other outlet unless the blades
can be fully inserted to prevent blade exposure.
CAUTION
4

B-52 ACTPRO Active Systems - Instruction Manual
THE BEAUTY OF POWER ACTPRO
5
AMPIFIER FEATURES
• Bi-ampdesignwithdiscreteoutputstagefor
both the woofer and compression driver
• 4thorderelectronicX-overandmulti-stage
custom equalization
• Proprietaryefcientclass-Gamplication
on low frequency channel
• Subsoniclter:12dB/octave
• Built-incompressor/limiter
• BalancedXLRinput(LeftandRighton
ACTPRO18S Sub)
• BalancedXLRfull-rangeoutput(LeftandRight
on ACTPRO18S Sub)
• LeftandRightbalancedXLRhigh-passoutputs
on ACTPR018S Sub
• 0-1800Phase switch on ACTPRO18S Sub
• 100Hz18dB/octavelowcutswitchon
Full Range models
• 3rdorderelectroniccrossoveronACTPRO18S
• Groundliftswitch
• Fullthermal&shortcircuitprotection
• Largeheatsinkwithconvectioncooling
• Oversizedtoroidaltransformer
• LEDsforPower,Protect,LimitandSignal
• 115V/230V60Hz/50Hzselectorswitch
POWERED LOUDSPEAKER FEATURES
CABINET FEATURES
• MadeinU.S.A.usingadvancedCNCrouters
• 5/8”birchplywoodconstruction
(ACTPRO12M, ACTPRO15, ACTPRO1515)
• 3/4”birchplywoodconstruction(ACTPRO18S)
• Main&monitorsittingpositions(ACTPRO12M)
• Reinforcedinternalbracings
• EnvironmentallyfriendlyWarneckeTM scratch
resistant black paint finish
• 16gaugewraparoundsteelgrilles
• Metalhandlesandrubberfeet
• Rubberstrips(ACTPRO12M)
• Metalpolemountingcup
(ACTPRO1515 excluded)
• FrontlogoilluminatedwithblueLED
• Sophisticatedcomputermodelingwasusedto
optimize the magnetic and acoustic design of
these ferrite magnet compression drivers to
achieve outstanding performance and reliability.
• Amatchedwavefrontphasecorrectorproduces
a perfectly coherent sound wave at the horn
throat, for a detailed and dynamic mid and high
frequency performance.
• Thepolyimide-insulated,copper-cladaluminum
voice coil is edge-wound on a glass fiber former
resulting in a lower distortion and superior power
to weight ratio.
• Aone-piece,PETPlmdiaphragmandsurround
optimizes energy transfer for greater efficiency
• Theuniquepatentedclampingsystemcontributes
directly to a low distortion performance while
improving the lower mid-band response.
PETP-FILM DIAPHRAGM COMPRESSION DRIVER
COMPONENTS
• CompressionDriver:
 o Celestion1”-exitwithPETPlmdiaphragm
• Horns:
o 900x 400constant directivity horn
  (ACTPRO15&ACTPRO1515)
o Conical wave guide (ACTPRO12M)
• LFTransducers:
 o Ventedmagnetassembliesforadvanced
cooling
o High temperature copper voice coil wound on
polyamide former for increased reliability
o Celestion SP-1200 (ACTPRO12M)
 o CelestionSP-1500(ACTPRO15&
ACTPRO1515)
o Proprietary SP-1804 cast frame subwoofer
(ACTPRO18S)

THE BEAUTY OF POWER
B-52 ACTPRO Active Systems - Instruction Manual
ACTPRO
6
HOW THEY SHOULD BE USED
ACTPRO12M
The ACTPRO12M was designed to sit on the floor
as a stage monitor, to be pole-mounted on a 38mm
diameter speaker stand or mounted above the
ACTPRO18S subwoofer using or a pole inserted into
the pole cup of the ACTPRO18S.
IMPORTANT:
Donotexceedapolelengthlongerthan31”
(787mm) when supported atop an ACT PRO18S
subwoofer.
ACTPRO15
The ACTPRO15 was designed to sit on the floor, on stage,
on a subwoofer enclosure, or pole mounted on a 38mm
diameter loudspeaker support pole. The pole can be part
of a loudspeaker stand or a pole inserted into the pole-
mounting cup of the ACTPRO18S.
IMPORTANT
When used in conjunction with the ACTPRO18S,
the mounting pole length must not exceed
26”(660mm)inlength.

B-52 ACTPRO Active Systems - Instruction Manual
THE BEAUTY OF POWER ACTPRO
7
ACTPRO1515
The ACTPRO1515 was designed to sit on the floor,
onstage, or placed on top of the ACTPRO18S
subwoofer enclosure.
IMPORTANT
Do not attempt to pole-mount this loudspeaker atop
the ACTPRO18S subwoofer cabinet.
ACTPRO18S
The ACTPRO18S was designed to sit on the
floor or onstage. A pole cup built into the top
of the enclosure accepts 38mm loudspeaker
mounting poles. For best quality sound, detach
the supplied casters while the subwoofer is in
operation.
IMPORTANT
Do not pole-mount or stack more
than one full-range ACTPRO enclosure
on top of the ACTPRO18S.

THE BEAUTY OF POWER
B-52 ACTPRO Active Systems - Instruction Manual
ACTPRO
8
Prior to operation, ensure the amplifier located on the rear of the enclosure has adequate
space behind it for proper ventilation. Ensure that all safety precautions regarding the
operation of loudspeakers and related electronic equipment are understood and adhered
to. Consult a licensed, Professional Engineer regarding physical equipment installation.
Do not modify the cabinet construction of any ACTPRO Series cabinet to suspend the
loudspeaker. Do not attempt to suspend any ACTPRO Series cabinet by the handles. Any
attempt to suspend an ACTPRO Series cabinet could result in injury or death.
COOLING
The ACTPRO loudspeakers use a power amplifier that produces heat. Provide a minimum
of8”(203mm)clearancefromthebackofthecabinettoanywallfortheconvection
cooling to be efficient. Keep all objects that may restrict airflow away from the rear of the
enclosure (i.e boxes, draperies, fabric, etc...).
Do not operate any ACTPRO models, except ACTPRO12M, when oriented in a horizontal
position. Operating an ACTPRO Series cabinet in the horizontal position can cause over-
heating and thermal limiting. The cooling fins on the amplifier module must be vertical, in
order to disperse the heat generated by the amplifier efficiently.
ACTPRO12M is designed to be used as a floor monitor. When in horizontal position it
can operate long-term without overheating if not pushed to the limit. Observe proper
signal level to prevent overheating the ACTPRO12M in a floor monitor application.
During operation, or permanent installation of enclosures, do not position any ACTPRO
loudspeaker with its rear panel exposed to direct sunlight. Direct sunlight heats the
amplifier module and will limit its ability to produce full output long-term.
Do not install enclosures where rain or other water sources can contact the cabinet or
amplifier. Although durable, the ACTPRO Series enclosure is not weatherproof. Installation
in outdoor locations must provide protection from the elements.
INSTALLATION

B-52 ACTPRO Active Systems - Instruction Manual
THE BEAUTY OF POWER ACTPRO
9
ACTPRO AMPLIFIER REAR CONTROLS
MAXMIN
P
R
O
F
E
S
S
I
O
N
A
L
B 52
-
115V: T4AL 250V
230V: T2AL 250V
FUSE:
OFF
ON
POWER
INPUT
OUTPUT
LEVEL
POWER
PROTECT
LIMIT
SIGNAL
~ 115V 60Hz 1.7A
~ 230V 50Hz 0.85A
GROUND
●
LIFT
●
EARTH
LOW CUT
●
ON
●
OFF
100Hz
AC SELECT
2-WAY 500-WATT POWERED LOUDSPEAKER
BI-AMP DESIGN
●
INTEGRATED SIGNAL PROCESSING
ACT PR O 12M
1
2
3
4
5
6
7
8
10
11
12
13
1. LED POWER INDICATOR
The green LED POWER indicator, located on
the back of the amplifier, will illuminate when
theACPowerswitchisinthe“ON”position.
The LED POWER indicator will dim and turn
offwhentheACPowerswitchisinthe“OFF”
position or AC mains power has been discon-
nected from the loudspeaker.
If the POWER indicator does not illuminate
when the loudspeaker is powered on, verify
the AC mains line cord is properly connected
to the loudspeaker and inserted into the AC
outlet.VerifytheACoutletatthevenueof
operation is functioning properly. In the event
of the AC mains outlet functioning properly,
but the loudspeaker fails to operate, the loud-
speaker may require servicing. Please contact
B-52’s Technical Support and Customer Service
Department.
2. PROTECT LED INDICATOR
If the power module overheats, the amplifier
willgointo“protectionmode”tolimitfurther
temperature rise. The amplifier will take about
30 seconds to several minutes for the tempera-
ture to drop and resume operation. When this
occurs, the exposed heat sink will feel hot to
the touch.
Overheating is usually caused by exces-
sive ambient temperature, direct sunlight for a
prolonged period of time during operation, or
playing the loudspeaker past its operational
limits.
If thermal overheating occurs, reduce signal
level to avoid constant illumination of the LIMIT
LED INDICATOR. In some circumstances, when
ambient temperature is too high, you may need
to set a fan behind the speaker to improve ven-
tilation at heatsink.
ACTPRO12M, ACTPRO15, ACTPRO1515

THE BEAUTY OF POWER
B-52 ACTPRO Active Systems - Instruction Manual
ACTPRO
10
ACTPRO AMPLIFIER REAR CONTROLS
MAXMIN
INPUTS
HP OUTPUTS
LEVEL
POWER
PROTECT
LIMIT
SIGNAL
L
R
OUTPUTS
L
R
L
R
GROUND
●
LIFT
●
EARTH
PHASE
●
180
●
0
700-WATT POWERED SUBWOOFER
INTEGRATED SIGNAL PROCESSING
P
R
O
F
E
S
S
I
O
N
A
L
B 52
-
115V: T6.3AL 250V
230V: T3.15AL 250V
FUSE:
OFF
ON
POWER
~ 115V 60Hz 2.5A
~ 230V 50Hz 1.25A
AC SELECT
ACT PR O 18S
1
2
3
4
5
7
8
10
11
12
13
9
3. LIMIT LED INDICATOR
The red LIMIT indicator alerts the user that the
amplifier output signal is clipping and therefore
is being compressed by the built-in clip-limiter.
MomentaryBrightRedFlashes
Indicates that the amplifier is clipping briefly
causing overdrive distortion and the internal
limiter is reducing gain.
ACTPRO amplifiers employ a sophisticated com-
pressor-limiter circuitry, which is nearly inaudible
at moderate overdrive conditions. It is normal to
see the occasional flashing of the red LIMIT LED.
ContinuousBrightRedLight
Indicates continuous and gross overloading of
the amplifier. Such overloads are audible and
may lead to overheating of the amplifier and
shortening the life of the speaker components. If
the amplifier is grossly overloaded and the red
LIMIT LED is on the most of the time, the operator
should reduce the signal level so that LIMIT LED
only flashes occasionally.
4. SIGNAL LED INDICATOR
The green SIGNAL indicator alerts the operator
to the presence of an input signal at the loud-
speaker amplifier.
If there is no indication, check the gain settings
on the amplifier and increase the gain if neces-
sary. Check input connections and audio source
for signal. If no output persists, try a different sig-
nal cable from your mixer to the ACTPRO Series
loudspeaker. If the green SIGNAL LED remains
illuminated without a source connected, the amp
may need servicing.
5. LEVEL CONTROL
TurntheLEVELcontrolclockwisetoincreasegain
and counter clockwise to decrease gain. When
operating with the GAIN set at 1/3 volume or
below, it may be possible to exceed the head-
room of input circuitry on your ACTPRO loud-

B-52 ACTPRO Active Systems - Instruction Manual
THE BEAUTY OF POWER ACTPRO
11
speaker. If this is the case, reduce the input signal
strength and increase the gain of the loudspeaker
amplifier.
Always observe the red LIMIT LED on the ampli-
fier panel. This LED illuminates when signal is clip-
ping and compressor-limiter is activated. All ACTPRO
amplifiers employ sophisticated limiter circuitry, which
monitors signal condition at both LF and HF amplifiers
(LF only on ACTPRO18S) and compresses output sig-
nal when necessary to protect woofer and compres-
sion driver from damages. Limiter circuitry works very
unobtrusively, you may not even notice when it acti-
vates. It may prompt you to push input signal more,
it is good practice for the red LIMIT LEDs to blink
occasionally but not constantly. Constant illumination
of the LIMIT LED indicates a gross overloading condi-
tion and should be avoided. Reduce the signal level if
LIMIT LED lights constantly or blinks constantly!
 NotethatLEVELControlhasarangeof30dB.It
doesnotattenuateoutputsignaltozero.LEVELcontrol
on ACTPRO loudspeakers is used to set optimal maxi-
mum level for performance, not for constant control
of sound volume. Your mixer’s master volume control
should be used for this purpose.
NOTEthatLEVELcontrolprovidesabout12dBat-
tenuation in middle position. You will find that in most
cases the best sound (lowest distortions and lowest
noise)willbeachievedwhenLEVELControlisset
somewhere between middle and FCW position.
6. LOW CUT SWITCH
(ACTPRO12M, ACTPRO15, ACTPRO1515)
FoundbeneaththeLEVELcontrol,thissmallslider
switch engages or disengages the 100Hz 18db/
Octave Low Cut filter. Switch the filter OFF when not
using subwoofers in the system. Switch the filter ON
when you are connecting subwoofers. This will enable
your subwoofer-equipped system to operate properly
and allow the full range loudspeakers to provide im-
proved clarity in the mid and high-range frequencies.
NOTE that when you connect ACTPRO full-range
active loudspeaker to HP outputs of ACTPRO18S
subwoofer, DO NOT engage LOW-CUT switch on
full-range loudspeaker. Input signal for your full-range
loudspeaker has already been processed by ACT-
PRO18S’s circuitry.
ACTPRO12M: We recommend switching the filter
ON for the best sound clarity. If using as a floor moni-
tor, turn the filter ON for improved vocal range clarity
and to reduce low frequency build-up on stage.
7. OUTPUT CONNECTIONS
AllFull-rangemodelshaveoneXLRoutputconnector
marked OUTPUT. The output connector is wired in
parallel with the input, allowing connection of multiple
enclosuresina“daisy-chain”fashion.The
ACTPRO18S0 has two sets of output connectors,
one set (left and right) for full-range outputs (wired in
parallel with inputs) and one set (left and right) for
high-pass outputs.
ACTPRO12M, ACTPRO15, ACTPRO1515
InserttheXLRconnectorintothejackmarkedOUT-
PUT. Connect the other end of the cable to the input of
the next audio device, such as another ACTPRO full
range active loudspeaker.
ACTPRO-18SOUTPUT(FullRange)
Use the outputs marked OUTPUT (Full Range) (left
and/or Right) when you are connecting to other ACT-
PRO speakers and/or to other powered loudspeakers
that enable full-range audio or if they feature their
own low frequency filtering.
HP OUTPUTS: Use the outputs marked HP OUTPUT
(Left and/or Right) when you are connecting other
ACTPRO and/or other powered loudspeakers that
DO NOT feature low frequency filtering or when the
low frequency roll off is desired. DO NOT use the
HP OUTPUT connectors for connecting other pow-
ered subwoofer loudspeakers - use the OUTPUT (Full
Range) line outs instead. Make sure to power OFF
any ACTPRO and/or other powered loudspeaker
connected to the HP OUTPUT before turning off the
ACTPRO subwoofer power. If done correctly, this will
ACTPRO AMPLIFIER REAR CONTROLS

THE BEAUTY OF POWER
B-52 ACTPRO Active Systems - Instruction Manual
ACTPRO
REAR PANEL CONTROLS (cont.)
12
prevent any unwanted transients (thuds, low-pops)
from coming out of the connected loudspeakers.
IMPORTANT! When you connect ACTPRO full-range
active loudspeaker to HP outputs of ACTPRO-18S
subwoofer, DO NOT engage LOW-CUT switch on
full-range loudspeaker. Input signal for your full-range
loudspeaker has already been processed by
ACTPRO18S’s circuitry.
IMPORTANT! If using full range loudspeakers from
another manufacturer, we recommend that they be
connected to the HP OUTPUT. This will ensure proper
phasing of the full range loudspeaker with respect to
the ACTPRO18S subwoofer.
8. INPUT CONNECTIONS
AllFull-rangemodelshaveonefemaleXLRline-level
input marked INPUT. The ACTPRO18S has a second
connector (two input connectors total), one for the left
channel’s audio input and one for the right channel’s
audio input. Balanced connections should be used as
much as possible to reduce AC hum and interference.
On all ACTPRO amplifiers, the input impedance is
20k ohm for balanced connections.
ACTPRO12M, ACTPRO15 AND ACTPRO1515
InsertthemaleXLRconnectorintothejackmarked
INPUT. Ensure the connector is fully seated.
ACTPRO18S-ForStereoOperationWith
Full-RangeCabinets: From your mixer, insert the
leftchannel’sXLRconnectorintotheleftchannel’s(L)
INPUT connector. Connect the right channel of your
mixerbyinsertingtheXLRconnectorintotheright
channel’s (R) INPUT connector on the amplifier. If
a single input signal is used, (for mono operation)
plug into the L (left) channel’s input. When two input
signals are supplied to the amplifier, the subwoofer’s
gain is automatically increased by 6dB.
9. PHASE SWITCH (ACTPRO18S)
When all of the loudspeakers in a system are op-
erating with the same polarity, a positive polarity
signal causes the excursion (the forward motion) of
all loudspeaker cones. In turn, this sets up a positive
reinforcement of the sound wave (each loudspeaker
reinforces the output of the other loudspeakers). This
effectreferstothespeakersbeing“inphase”The
effectofproper“phasing”ismostnoticeableinlow
(bass) frequencies. If a loudspeaker’s phase is incor-
rect, its cone moves inward while the properly phased
loudspeaker’s cones move outward. The inward move-
ment, of the improperly phased loudspeaker, will ef-
fectively cancel the bass response of a similarly-sized
driver in the system. This results in a reduction of the
bass output.
It is important to maintain correct phasing in a
loudspeaker system, in order to operate at maximum
performance. Incorrect polarity can be caused by
incorrectly wired cables, interconnecting cables, and
mixer functions set incorrectly.
Phasing is also influenced by the mutual position-
ing and orientation of the loudspeakers in a system. It
is possible to have proper polarization (of all cables
and equipment) and still achieve better bass response
by having the subwoofer set to reverse polarity, or
having several subwoofers set at different polarities.
Bass response also will change with the listener’s
position in the room. During testing, monitor the bass
response from several different locations in venue.
Since proper phase is crucial to a subwoofer, the
ACTPRO18S has a polarity switch labeled PHASE.
When the PHASE switch is set to 0°, the polarity is
such that a positive input will cause the cone to push
outward. When set to 180°, the input signal’s polarity
is reversed and a positive going input will cause the
loudspeaker’s cone to pull inward.
HowToUseThePhaseSwitch
Start all subwoofers in the system with PHASE switch-
es in the 0° position. This is the same for systems with
one subwoofer as well. Next, with your system play-
ing at or near expected operating level, change the
polarity of each subwoofer, ONE AT A TIME. Walk
around the venue and critique the overall bass re-
sponse. Select the phase setting that produces in the

B-52 ACTPRO Active Systems - Instruction Manual
THE BEAUTY OF POWER ACTPRO
13
REAR PANEL CONTROLS (cont.)
best overall bass response.
10. GROUND LIFT SWITCH
All ACTPRO active loudspeakers’ amplifiers are
equipped with a GROUND LIFT switch. Powered
loudspeakers are often fed by long run signal cables,
and connected to power outlets different from power
outlets for audio sources. It may create an audible
hum or buzz due to ground loops or other connec-
tion problems. GROUND LIFT switch will help you to
avoid it. It is a good practice to keep the GROUND
LIFT switch in EARTH position unless you have hum or
buzz coming from your speakers. If you do hear hum
or buzz, try to toggle switch into LIFT position.
WARNING:NEVERBREAKEARTHCONNECTION
IN YOUR AC PLUG. IT MAY CAUSE PERMANENT
DAMAGE TO THE AMPLIFIER AND MAY CAUSE
DANGER OF ELECTRICAL SHOCK TO YOU AND
OTHERS.
11. POWER SWITCH
Push in the top of the power switch to apply AC pow-
er to the powered loudspeaker’s amplifier. Push in the
bottom of the power switch to turn the loudspeaker
amplifier off. When turned on, the blue POWER indi-
cator LED on the front grille will illuminate, along with
the POWER and PROTECT LED on the amplifier; after
a few seconds the yellow PROTECT LED indicator will
dim and turn off.
NOTE that System Power Sequencing prevents un-
expected sounds from your system (pops, clicks,
thumps), make sure to power ON your ACTPRO
series loudspeakers in the proper order. Improper
sequencing while powering ON your equipment can
damage the loudspeakers. Power the loudspeaker
system ON and OFF in the proper order to avoid un-
expected sounds and damage to your loudspeakers.
PowerOnSequence: Turn ON all source devices
(CD players, mixers), turn ON the subwoofer, then
turn ON all Full-range loudspeakers.
PowerOFFSequence: Turn OFF all Full-range
loudspeakers and then subwoofers. Lastly, power
down all source devices.
12. AC MAINS
Connect IEC connector of the AC power cord to the
IEC socket on the back of the amplifier by insert-
ing the IEC power cord fully into the IEC inlet on the
power amplifier module.
NOTE: Turn off the power switch on the ACTPRO
before connecting the AC power cord. The correct
AC line voltage should be selected on the rear panel.
For operation in the United States, leave the voltage
selectorontheampliersetto115V.Connectingto
the wrong line voltage will damage the amplifier and
may create the risk of electric shock.
ACMainsDisconnection: Turn the AC power
switch to the off position. To remove the AC power
cord, grasp the IEC connector’s plastic body and
gently remove the IEC connector from the socket by
pulling it straight toward you.
13. AC SELECT SWITCH
Make sure the AC Select Switch is set to the voltage
appropriate to the country it is being used in.
NOTE: If the voltage switch is set incorrectly and does
not match the appropriate voltage the amplifier may
become damaged and it may create a risk of electri-
cal shock.

THE BEAUTY OF POWER
B-52 ACTPRO Active Systems - Instruction Manual
ACTPRO
14
CONNECTIONS
EXAMPLE #1
This example shows a two-channel (stereo) setup utilizing two Full-range loudspeakers (ACTPRO12M,
ACTPRO15, ACTPRO1515). Audio signals for the Left and Right channels are supplied by the mixer
console,inthisexample,aProdigyFX.TheleftchanneloutputfromthemixerisconnectedtotheINPUT
connector on the left full-range ACTPRO loudspeaker. The right channel output from the mixer is then con-
nected to the INPUT connector on the right Full-range ACTPRO loudspeaker. Turn OFF the 100 Hz LOW-
CUT FILTER. This will ensure that both speakers are outputting the most bass possible, to compensate for a
subwoofer not being used.

B-52 ACTPRO Active Systems - Instruction Manual
THE BEAUTY OF POWER ACTPRO
15
EXAMPLE #2
This example shows a two-channel (stereo) setup utilizing one subwoofer and two full-range cabinets. Audio
signals for the Left and Right channels are provided by the mixer. Audio output from the mixer is connected to
the L and R INPUTS of the ACTPRO18S. The Left HP OUTPUT from the ACTPRO18S is connected to the INPUT
on the left full-range cabinet. Likewise, the Right HP OUTPUT from the ACTPRO18S is connected to the right
full-range cabinet.
Note: If you are using a subwoofer other than ACTPRO18S for your setup, and this subwoofer does not have
100Hz High Pass outputs but only Full Range outputs, set the 100 Hz FILTER on you ACTPRO full-range cabi-
nets to the ON position.
Note: If using connection set-up below, set the LOW-CUT switches on the Full-range speakers to the OFF
position. The signal is processed by the ACTPRO18S subwoofers.

THE BEAUTY OF POWER
B-52 ACTPRO Active Systems - Instruction Manual
ACTPRO
16
CONNECTIONS
Example#3
This example shows a two-channel (stereo) setup utilizing two full-range cabinets and two subwoofers. The
Full-range speakers (ACTPRO12M, ACTPRO15) are pole mounted atop the ACTPRO1S8. You may also use
a ACTPRO1515 stacked on each ACTPRO18S. Audio signals for the Left and Right channels are supplied by
themixerconsole,inthisexample,aProdigyFX.TheleftchanneloutputfromthemixerisconnectedtotheL
INPUT connector on ACTPRO18S subwoofer. The Right channel output from the mixer is connected to the L
INPUT connector on another ACTPRO18S subwoofer. The left input is used on both subwoofers.
AnXLRcableisthenconnectedfromtheLeftHPOUTPUTfromACTPRO18S,totheINPUTofthefull-range
loudspeakerontheleftside.Likewise,anotherXLRcableisconnectedfromtheLeftHPOUTPUToftheACT-
PRO18S, to the INPUT on the full-range loudspeaker on the right side.
Note: If you are using a subwoofer other than ACTPRO18S for your setup, and this subwoofer does not have
100Hz High Pass outputs but only Full Range outputs, set the 100 Hz FILTER on you ACTPRO full-range cabi-
nets to the ON position.
Note: If using connection set-up below, set the LOW-CUT switches on the Full-range speakers to the OFF
position. The signal is processed by the ACTPRO18S subwoofers.

B-52 ACTPRO Active Systems - Instruction Manual
THE BEAUTY OF POWER ACTPRO
17
Example#4
This example shows a two-channel (stereo) setup utilizing multiple subwoofers and multiple full-range cabinets.
To connect to additional full-range loudspeakers, connect a cable from the last full-range cabinet’s OUTPUT to
the INPUT connector of next full-range cabinet on the same side. Up to 10 additional speakers can be “daisy-
chained”withoutlossofsignalquality.
Note: If you are using subwoofers other than ACTPRO18S for your setup, set the 100 Hz FILTER on your
ACTPRO Full-range cabinets to the ON position.
Note: If using connection set-up below, set the LOW-CUT switches on the Full-range speakers to the OFF
position. The signal is processed by the ACTPRO18S subwoofers.

THE BEAUTY OF POWER
B-52 ACTPRO Active Systems - Instruction Manual
ACTPRO
18
CONNECTIONS
EXAMPLE #5
This example shows the set-up of a pair of ACTPRO12M loudspeakers to be used as stage monitors. The
audiosignalisprovidedbyamixer,aProdigyFXinthisexample.Somemixershaveamonomonitor
output but in this case you can daisy-chain a few ACTPRO12M speakers by connecting the INPUT of one
totheOUTPUTofanotherwithanXLRcable.
Note:It is recommended to turn the LOW-CUT switch ON for better clarity in guitar and voice ranges
and avoid LF build-up on the stage.
Note:You can add the ACTPRO12M as a monitor to any of the previous examples (1 through 4) or to
any other set-up.

B-52 ACTPRO Active Systems - Instruction Manual
THE BEAUTY OF POWER ACTPRO
19
SPECIFICATIONS
ACTPRO12M ACTPRO15 ACTPRO1515 ACTPRO18S
Configuration 12” 2-Way multipurpose 15” 2-Way full-range Dual 15” 2-Way full-range 18” powered subwoofer
powered loudspeaker powered loudspeaker powered loudspeaker
Transducers:
Low Frequency SP-1200 - 12” speaker with SP-1500 - 15” speaker SP-1500 - 15” speaker with SP-1804 - 18” cast-framed
2.5” voice coil with 2.5” voice coil 2.5” voice coil subwoofer with 3” voice coil.
High Frequency COMP-4-CLB - PETP film compression COMP-4-CLB - PETP film compression COMP-4-CLB - PETP film compression N/A
driver with 1.75” voice coil driver with 1.75” voice coil driver with 1.75” voice coil
LF Magnet Weight 42 oz 42 oz 42 oz 100 oz
LF Magnet Structure Weight 7 lbs. 7 lbs. 7 lbs. 17 lbs.
Frequency Range 50 Hz - 20 kHz 47 Hz -20 kHz 42 Hz - 20 kHz 35 Hz - 140 Hz
Frequency Response 58 Hz -18 kHz 56 Hz -18 kHz 52 Hz -18 kHz 46 Hz - 100 Hz
High Frequency Dispersion 75º conical 90º x 40º 90º x 40º N/A
Power Output LF: 270Wrms Class G LF: 270Wrms Class G LF: 500Wrms Class G LF: 500Wrms Class G
HF: 80Wrms Class AB+B HF: 80Wrms Class AB+B HF: 90Wrms Class AB+B
Maximum total burst power* 500W 500W 850W 700W
Input Impedance 20 kOhm Balanced 20 kOhm Balanced 20 kOhm Balanced 20 kOhm Balanced
10 kOhm Unbalanced 10 kOhm Unbalanced 10 kOhm Unbalanced 10 kOhm Unbalanced
Electronic Crossover 4th order 4th order 4th order 3rd order Butterworth @ 100 Hz
Low Cut Filer (switchable) 3rd order Butterworth @ 100 Hz 3rd order Butterworth @ 100 Hz 3rd order Butterworth @ 100 Hz
Controls Level knob Level knob Level knob Level knob
Low-cut filter switch Low-cut filter switch Low-cut filter switch Phase switch
Ground lift switch Ground lift switch Ground lift switch Ground lift switch
Power switch Power switch Power switch Power switch
AC fuse AC fuse AC fuse AC fuse
115/230V switch 115/230V switch 115/230V switch 115/230V switch
Indicators Power Power Power Power
Protect Protect Protect Protect
Limit Limit Limit Limit
Signal Signal Signal Signal
Cooling Convection Convection Convection Convection
Amplifier Protection Short circuit Short circuit Short circuit Short circuit
Clip-limiter Clip-limiter Clip-limiter Clip-limiter
Overheat mute Overheat mute Overheat mute Overheat mute
SOA output stage SOA output stage SOA output stage SOA output stage
Driver DC protection Driver DC protection Driver DC protection Driver DC protection
Subsonic filter Subsonic filter Subsonic filter Subsonic filter
Turn-on mute and soft ramp Turn-on mute and soft ramp Turn-on mute and soft ramp Turn-on mute and soft ramp
Turn-on inrush current limiting Turn-on inrush current limiting Turn-on inrush current limiting Turn-on inrush current limiting
Current cons. @ 115/230 Vac 1.7A / 0.85A 1.7A / 0.85A 3A / 1.5A 2.5A / 1.25A
(1/8 power pink noise)
Connectors Balanced female XLR input Balanced female XLR input Balanced female XLR input Balanced female XLR L&R inputs
Balanced male XLR link output Balanced male XLR link output Balanced male XLR link output Balanced male XLR L&R link outputs
Male XLR L&R High-pass outputs
Input Sensitivity ** 775mV (0dBu) 775mV (0dBu) 775mV (0dBu) 775mV (0dBu)
Enclosure Black Warnecke
TM
painted birch plywood Black Warnecke
TM
painted birch plywood Black Warnecke
TM
painted birch plywood Black Warnecke
TM
painted birch plywood
Hardware Metal handles Metal handles Metal handles Metal handles
Rubber feet / Rubber strips Rubber feet Rubber feet Rubber feet
Pole mounting cup Pole mounting cup Pole mounting cup
3” Detachable casters
Grille Powder coated 16 gauge steel Powder coated 16 gauge steel Powder coated 16 gauge steel Powder coated 16 gauge steel
Dimensions 26.5” H x 16.5” W x 16” D 27” H x 17.5” W x 19” D 44.5” H x 18” W x 19” D 26.5” H x 23.5” W x 23” D
(673mm x 419mm x 406mm) (686mm x 445mm x 483mm) (1130mm x 457mm x 483mm) (673mm x 597mm x 584mm)
Weight 56 lbs. / 25.5 kg 62 lbs. / 28.2 kg 89 lbs. / 40.5 kg 97 lbs. / 44.1 kg
* Based on unclipped sine-wave rms voltage
** Level control in fully clockwise position

THE BEAUTY OF POWER
B-52 ACTPRO Active Systems - Instruction Manual
ACTPRO
B 52
-
B-52 PROFESSIONAL
3383GageAvenue,HuntingtonPark,CA90255
Internet:www.B-52Pro.com
Ph:323-277-4100Fax:323-277-4108
TollFree:800-344-4384
B-52Professionalisdedicatedtoproductexcellenceandthereforecontinuouslyattemptstoimproveeachandevery
modelwemanufacture.Thisongoingprocessincludesrenementsindesign,materialsandworkmanshipwhichmay
resultinproductswhichdifferthanthosedescribedinourliterature.Allfeatures,specications,pricesandtermsare
subjecttochangewithoutnotice.
20
Thank you for choosing the ACTPRO powered loudspeakers, a product
by E.T.I. Sound Systems, Inc. For purposes of this warranty B-52 shall
mean E.T.I. Sound Systems, Inc. B-52 manufactures some of the world’s
best audio products and takes great pride in thoroughly testing each
B-52 product prior to shipment.
ACTPRO POWERED LOUDSPEAKER WARRANTY:
B-52 warrants to the original purchaser that this ACTPRO Powered Loud-
speaker will be free from defects in material and workmanship for a pe-
riod of (3) THREE YEARS from the original purchase date. A dated sales
receipt will establish coverage under this warranty. This warranty will
automatically terminate (3) THREE YEARS after the original sales date. It
is the owner’s responsibility to establish date and place of purchase by
acceptable evidence at the time service is being sought.
This (3) THREE-YEAR warranty does not cover service or parts to
repair damage caused by accident, disaster, misuse, abuse, wear
and tear, subjecting the unit to power in excess of its published rating,
damage due to lightning or power surges, if the serial number has been
altered or removed, inadequate packing or shipping procedures and
service, repair or modifications to the ACTPRO powered loudspeaker
which has not been authorized or approved by B-52 in writing. Parts
supplied under warranty may be new or rebuilt at the option of B-52.
This warranty is in lieu of all other expressed warranties. If this product
is defective in materials or workmanship as warranted above, your sole
remedy shall be repair or replacement. This is not a service contract
and this warranty does not include maintenance, cleaning or periodic
check-up. B-52 reserves the right to make changes in design and/or
improvements to its products without any obligation to include these
changes in any products manufactured.
INCIDENTAL OR CONSEQUENTIAL DAMAGES:
In no event shall B-52 be liable for any incidental or consequential
damages arising out of the use or inability to use any B-52 product,
even if B-52 or a B-52 dealer has been advised of the possibility of such
damages, or any other claim by any other party. Some States do not al-
low the exclusion or limitation of consequential damages, so the above
limitation and exclusion may not apply to you. This warranty gives you
specific legal rights and you may also have other rights that may vary
from State to State.
PURCHASING FROM UNAUTHORIZED DEALERS:
If this product was purchased from an unauthorized dealer there are no
warranties, express or implied, including the implied warranty of mer-
chantability and the implied warranty of fitness for a particular purpose
andthisproductissold“asis”and“withallfaults”.
RETURN PROCEDURES:
In the event product repair is needed, follow the procedure outlined
below. Contact B-52 (1-800-344-4ETI or 1-323-277-4100) from 8am to
4:30pm Pacific Standard Time, for the location of the authorized service
center nearest you. Follow the service center’s instructions regarding re-
turn of the product. In some instances B-52 may request that you return
the product directly to B-52 for service or repair.
After speaking with a B-52 representative, you will be issued with a
return authorization number (RAN) which you need to clearly label the
returned merchandise with. If you are sending the product by common
carrier, package it carefully and send it with transportation prepaid by
traceable, insured method to B-52, or Authorized Service Center. Pack-
age the product using adequate padding material to prevent damage
in transit. The original packaging is ideal for this purpose. Include your
name, address, RAN #, copy of your receipt and telephone number
where you can be reached during business hours.
FOR YOUR PROTECTION:
Please complete and mail the Purchase Information Card within (10)
ten days of the date of purchase so that we may contact you directly
in the event a safety notification is issued in accordance with the 1972
Consumer Product Safety Act. In addition, we ask that you complete the
brief questionnaire so me may analyze your answers and in this way,
help us evaluate our customer needs.
CUSTOMER SERVICE:
Our dedicated staff is ready to help you with any B-52 warranty or
product questions you may have. Please call 323-277-4100 (9:00AM
to 4:00PM Pacific Standard Time, United States).
LIMITED WARRANTY