American Audio Loudspeaker APX152 Manual

							APX-152
™
Professional Two-Way Sound 
Reinforcement Loudspeaker
APX-Power Pro
™
Powered Professional Two-Way 
Sound Reinforcement Loudspeaker
AMERICAN AUDIO
4295 Charter Street
Los Angeles, Ca. 90058
www.AmericanAudio.us
Rev. 06/02 
						

							©American Audio®   -   www.AmericanAudio.us   -   APX-152™/APX-PowerPro™   -   Instruction Manual Page 2
CUSTOMER  SUPPORT..........................................................................................................................2
UNPACKING.............................................................................................................................2
HANDLING  PRECAUTIONS...................................................................................................................3
FEATURES...........................................................................................................................................4
PRODUCT REGISTRATION....................................................................................................................5
AVAILABLE  ACCESSORIES...................................................................................................................5
CONTROLS AND FEATURES.................................................................................................................6
APX-POWER PRO (REAR PANEL)..........................................................................................................8
RIGGING  AND  MOUNTING.................................................................................................................13
WARRANTY.......................................................................................................................................23
SPECIFICATIONS............................................................................................................................15
APX-152™....................................................................................................................16
APX-PowerPro™...............................................................................................................17
APX-152™/APX-PowerPro™                    Warranty
APX-152™/APX-PowerPro™                        Unpacking
APX-152™/APX-PowerPro™                       Introduction
Introduction: Congratulations  and  thank  you  for  purchasing  the  American  Audio®  APX-152™  or  the 
APX-Power Pro™ professional sound reinforcement loudspeaker. This loudspeaker is a representation 
of  American  Audio’s  continuing  commitment  to  produce  the  best  and  highest  quality  audio  products 
possible at an affordable price. The APX-152™ is a two-way passive loudspeaker system encased in a 
light weight polyurethane encloser. This speaker has been designed to be used as both a portable and 
a permanently installed unit. The speaker includes a poll mount slot and rubber feet on the bottom of 
the unit for portable applications and also includes rigging points on the top, bottom, and rear of the 
unit  for  permanent  and  fl ight  installations.  The  APX-Power  pro™  is  a  225  watt  self  powered  version 
of the APX-152™ with the same features. Please read and understand this manual completely before 
attempting to operate your new speaker system. This booklet contains important information concern-
ing the proper and safe operation of your new speaker.
Customer Support: American Audio® provides a toll free customer support line, to provide set up help 
and  answer  any  question  should  you  encounter  problems  during  your  initial  set  up  or  operation.  You 
may also visit us on the web at www.americandj.com for any comments or suggestions. Service Hours 
are Monday through Friday 9:00 a.m. to 5:30 p.m. Pacifi c Standard Time.
Voice:   (800) 322-6337
Fax:(323) 582-2610
E-mail: [email protected]
Caution! There  are  no  user  serviceable  parts  inside  this  speaker.  Do  not  attempt  any  repairs,  without 
being instructed to do so by an authorized American Audio technician. Doing so will void your manufac-
tures warranty. In the unlikely event your speaker may require service, please contact American Audio®.
Every  APX-152™ and APX-Power Pro™ has been thoroughly tested and has been shipped in perfect 
operating condition. Carefully check the shipping carton for damage that may have occurred during 
shipping. If the carton appears to be damaged carefully inspect your units for any damage and be sure 
all  accessories  necessary  to  operate  the  system  have  arrived  intact.  In  the  event  damage  has  been 
found or parts are missing, please contact our toll free customer support number for further instruc-
tions. Please do not return the speaker to your dealer without fi  rst contacting customer support.  
						

							©American Audio®   -   www.AmericanAudio.us   -   APX-152™/APX-PowerPro™   -   Instruction Manual Page 3
ELECTRICAL PRECAUTIONS
RISK OF ELECTRIC SHOCK�D�O� �N�O�T� �O�P�E�N
�C�A�U�T�I�O�N
The exclamation point within an equilateral triangle is
intended to alert �the  user  to �the  presence  of important
operating  and maintenance  (servicing) instructions  in
�the literature accompanying the appliance.
�T�h�e� �l�i�g�h�t�n�i�n�g� �f�l�a�s�h� �w�i�t�h� �a�r�r�o�w�h�e�a�d� �s�y�m�b�o�l�,� �w�i�t�h�i�n� �a�n�e�q�u�i�l�a�t�e�r�a�l� �t�r�i�a�n�g�l�e�,� �i�s� �i�n�t�e�n�d�e�d� �t�o� �a�l�e�r�t� �t�h�e� �u�s�e�r� �t�o� �t�h�e�p�r�e�s�e�n�c�e� �o�f� �u�n�i�n�s�u�l�a�t�e�d� �"�d�a�n�g�e�r�o�u�s� �v�o�l�t�a�g�e�"� �w�i�t�h�i�n� �t�h�e
product's  enclosure  that may  be of sufficient  magnitude
�t�o� �c�o�n�s�t�i�t�u�t�e� �a� �r�i�s�k� �o�f� �e�l�e�c�t�r�i�c� �s�h�o�c�k� �t�o� �p�e�r�s�o�n�s�.
READ INSTRUCTIONS  � A�l�l� the  safety  and operatin�g
instructions  should be read  before  the product �i�s
operated.
RETAIN INSTRUCTIONS —  The safety and operatin
�g
instructions  should be retained �f�o�r� �f�u�t�u�r�e�  reference.
HEED  WARNING�S� — All  warnings  on the  product  and�i�n� the  operating  instructions  should be adhered �t�o�.
FOLLOW  INSTRUCTIONS  �� All  operating  and use
instructions should be followed.
CLEANING 
 � T he  product  should be cleaned  only �w�i�t�ha polishing  cloth or a �s�o�f�t� dry cloth.  Never  clean �w�i�t�h�f�u�r�n�i�t�u�r�e�  wax, benzine,  insecticides  or other �v�o�l�a�t�i�l�e
liquids since they may corrode the cabinet�.�A TTACHMENTS  �� Do  not  use �attachments  not
recommended  by the  product  manufacturer  as they
may cause hazards.
WATER  AND MOISTURE 
 �� Do  not  use �t�h�i�s�  product
near �w�a�t�e�r� — �f�o�r�  example,  near a bathtub,  wash
bowl,  kitchen  sink, or laundry  tub; in a wet  basement�;
or near a swimming pool; and the like.
ACCESSORIES 
 ��  Do  not  place �t�h�i�s�  product  on an
unstable  cart, stand,  tripod,  bracket,  or table.  Th�e
product  may �f�a�l�l�,� causing  serious �i�n�j�u�r�y� �t�o� a �c�h�i�l�d� or�a�d�u�l�t�,�  and serious  damage �t�o� the  product.  Use onl�y�with a  cart,  stand,  tripod,  bracket,  or �tabl�e
recommended  by the  manufacturer,  or sold �w�i�t�h
the  product.  Any mounting  of the  product  shoul�d�f�o�l�l�o�w� the manufacturer’s  instructions, and shoul�d
use a  mounting  accessory  recommended  by �t�h�e
manufacturer�.
CART  �� A  product  and cart combination  should be
moved �w�i�t�h�  care.  Quick  stops,  excessive  force, and
uneven  surfaces  may cause  the product  and car�t
combination to overturn�.
VENTILATION 
 ��  Slots  and openings �i�n� the  cabinet  ar�e
provided  for ventilation  and to ensure  reliabl�e
operation  of the  product  and �t�o� 
protect �i�t� from
overheating,  and 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 �s�i�m�i�l�a�r�  surface.  This product  should not be
placed �i�n� a �b�u�i�l�t�-�i�n�  installation  such as a bookcase  or
rack  unless  proper ventilation �i�s� provided  or �t�h�e
manufacturer’s  instructions have been  adhered �t�o�.
POWER  SOURCES — This  product  should be operated
only  from  the type  of power  source  indicated  on �t�h�e
marking  label. �I�f� 
you  are not sure  of the  type  of
power  supply �t�o� 
your  home,  consult  your product
dealer or local power company.
LOCATIO
�N� –  The  appliance  should be installed �i�n� �a
stable location.
NONUSE  PERIOD
�S� – The  power  cord of the  appliance
should  be unplugged  from the �o�u�t�l�e�t� 
when �l�e�f�t� un-
used for a long period of time. GROUNDING OR POLARIZATION
 "
If this  product  is equipped  with a polarized  alternatin�g
current  line plug �(�a� plug  having  one blade  wider than
the  other), �i�t� �w�i�l�l� �f�i�t� �i�n�t�o�  the �o�u�t�l�e�t�  only one way.  This�i�s� a safety  feature. �I�f� you  are unable �t�o� insert  the plug�f�u�l�l�y� �i�n�t�o�  the �o�u�t�l�e�t�,�  try reversing  the plug. �I�f� the  plug
should �s�t�i�l�l� �f�a�i�l� �t�o� �f�i�t�,�  contact  your electrician �t�o
replace  your obsolete �o�u�t�l�e�t�.�  Do not  defeat �t�h�e
safety purpose of the polarized plug.
 " If this  product  is equipped  with a three-wire
grounding  type plug, a plug  having a third  (grounding)
pin, �i�t� �w�i�l�l�  only �f�i�t� �i�n�t�o� a grounding  type power �o�u�t�l�e�t�.
This �i�s� a  safety  feature. �I�f� you  are unable �t�o� insert �t�h�e
plug �i�n�t�o�  the �o�u�t�l�e�t�,�  contact  your electrician �t�o
replace  your obsolete �o�u�t�l�e�t�.�  Do not  defeat �t�h�e
safety purpose of the grounding type plug.
POWER-CORD  PROTECTION 
�-� Power-supply  cords
should  be routed  so that  they  are not likely �t�o� be
walked  on or pinched  by �i�t�e�m�s� placed  upon or
against  them, paying  particular  attention �t�o� cords  at
plugs,  convenience  receptacles, and the point  wher�e
they exit from the product�.
OUTDOOR ANTENNA GROUNDING  �  If an outside
antenna  or cable  system  is connected  to the  product�,
be  sure  the antenna  or cable  system �i�s� grounded  so
as  to provide  some protection  against voltage  surges
and  built-up  static charges.  Article 810 of the  National
Electrical  Code, ANSI/NFPA  70, provides  informatio
�n�w�i�t�h� regard �t�o� proper  grounding  of the  mast  and
supporting  structure, grounding  of the  lead-in  wire
�t�o� an  antenna  discharge �u�n�i�t�,� size of grounding
conductors,  location of antenna-discharge  unit,
c o n n e c t i o n  t o g r o u n d i n g  e l e c t r o d e s ,  a n d
�requirements  for �the  grounding  electrode. �See  Figur�e
A.
LIGHTNING 
 ��  For  added  protection �f�o�r� �t�h�i�s� product
during a  lightning  storm, or when  it is  left  unattended
and  unused �f�o�r� long  periods  of �t�i�m�e�,� unplug �i�t� from
the �w�a�l�l�  outlet  and disconnect  the antenna  or cabl�e
system.  This �w�i�l�l� prevent  damage �t�o� the  product
due to lightning and power-line surges.
POWER  LINES 
 �� An  outside  antenna  system shoul�d
not  be located �i�n� the  vicinity  of overhead  power lines
or other electric light or power circuits, or where it
can 
�f�a�l�l� �i�n�t�o�  such  power  lines or circuits.  When
installing  an outside  antenna  system, extreme  car�e
should  be taken �t�o� keep  from touching  such power
lines  or circuits  as contact  with them  might  be �f�a�t�a�l�.�OVERLOADING  �� Do  not  overload  wall outlets�,
extension  cords, or integral  convenience  receptacles
as this can result in a risk of fire or electric shock. OBJECT 
AND LIQUID  ENTRY 
�- Never  push  objects  of
any  kind �i�n�t�o� �t�h�i�s� product  through  openings  as they
may  touch  dangerous  voltage points or short-out
parts  that could  result 
�i�n� a �f�i�r�e� or electric  shock.
Never spill liquid of any kind on the product�.
SERVICING —  Do  not �a�t�t�e�m�p�t� �t�o� service �t�h�i�s�  product
yourself  as opening  or removing  covers may expose
you 
�t�o�  dangerous  voltage or other  hazards. �R�e�f�e�r�  al�l
servicing to qualified service personnel�.
DAMAGE  REQUIRING  SERVICE � �-� Unplug �t�h�i�s�  product
from the wall outlet and refer servicing to qualifie�d
service personnel under the following conditions:
• W hen the power-supply cord or plug is damaged.
 "�I�f� liquid  has been  spilled,  or objects  have fallen �i�n�t�o
the product�. " If the product has been exposed to rain or water. "�I�f� the  product  does not operate  normally  by �f�o�l�l�o�w�i�n�g
the  operating  instructions.  Adjust only those  controls
that  are covered  by the  operating  instructions  as an
improper  adjustment  of other  controls  may result 
�i�n
damage and will often require extensive work by �a
qualified  technician �t�o� restore  the product �t�o� �i�t�s
normal operation.
 "�I�f�  the  product  has been  dropped  or damaged �i�n� any�w�a�y�.
• W hen the product  exhibits a distinct  change �i�n
performance — this indicates a need for service.
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,  electri
�c
shock, or other hazards.
SAFETY  CHECK 
�- Upon  completion  of any  service  or
repairs �t�o� �t�h�i�s�  product,  ask the service  technician �t�o
perform  safety checks �t�o� determine  that the product
is in proper operating condition.
WALL  OR CEILING  MOUNTING 
 � The  product  shoul�d
not be mounted to a wall or ceiling.
HEAT 
—  The  product  should be situated  away from heat
sources  such as radiators,  heat registers,  stoves, or
other  products  (including 
�a�m�p�l�i�f�i�e�r�s�)� 
that produce
heat�.
�I�M�P�O�R�T�A�N�T� �S�A�F�E�T�Y� �I�N�S�T�R�U�C�T�I�O�N�S
ANTENNA
LEAD IN
WIRE
GROUND
CLAM�P
ANTENNA
DISCHARGE UNI
�T
(NEC SECTION 810-20)
GROUNDING CONDUCTOR
�S
(NEC SECTION 810-21)
GROUND CLAMPS
POWER SERVICE GROUNDING
ELECTRODE SYSTEM
(NEC ART 250, PART H)
ELECTRI�C
SERVICE
EQUIPMENT
Fig. 
�A NEC — NATIONAL ELECTRICAL CODE
C A U T I O N : T O R E D U C E  T H E R I S K  O F E L E C T R I C 
SHOCK, DO NOT REMOVE THE COVER (OR BACK). 
T H E R E  A R E N O U S E R  S E R V I C E A B L E  P A R T S 
�INSIDE � REFER  SERVICE  TO YOUR  AUTHORIZED 
AMERICAN AUDI�O�� SERVICE TECHNICIAN.
APX-152™/APX-PowerPro™              Handling Precautions 
						

							©American Audio®   -   www.AmericanAudio.us   -   APX-152™/APX-PowerPro™   -   Instruction Manual Page 4
APX-152™/APX-PowerPro™                  Safety Precautions
•   The APX-152™ and the APX-Power Pro™ loudspeakers can easily reproduce sound pressure 
   levels (SPL) suffi cient enough to cause sever and permanent hearing damage. A great degree of
care should be taken to protect your ears to prolong exposure to SPL in excess of 85dB.
•For adult use only - Keep out of the reach of children.
• Be sure all power amps are turned off before making speaker connections
•Do not remove the speaker cover or grill under any conditions
•   Always use a power cord that meets the manufactures exact power specifi cations   Always use a power cord that meets the manufactures exact power specifi cations   
•   Disconnect from main power before making any type of connection
•   To reduce the risk of electrical shock or fi re, do not expose this unit rain or moisture
•   This speaker is intended for indoor use only, use of this product outdoors voids all warranties.
•   Always mount this speaker in safe and stable matter.   Always mount this speaker in safe and stable matter.   
•   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 cords 
at plugs, convenience receptacles, and the point where they exit from the mixer.
•   Heat -The speaker should be situated away from heat sources such as radiators, heat registers, 
stoves, or other mixers (including amplifiers) that produce heat
•Be sure to save the packing carton in the event the unit needs to be returned for service
•Read all documentation before attempting to operate your new mixer. Please save all your docu-
mentation for future reference
• Do not spill water or other liquids in to or on to your speaker
•Be sure that the local power outlet matches that of the required voltage for your speaker (APX-
Power Pro™ only)
•Do not attempt to operate this mixer if the power cord has been frayed or broken. Please route 
your power cord out of the way of foot traffi c
•Always have the gain controls set to their lowest level during initial power-up to prevent    
speaker damage
•Servicing - The user should not attempt to service the speaker beyond that described in this
manual. All other servicing should be referred to qualified service personnel. The speaker should 
only be serviced by qualified personal when;
   A.  Objects have fallen, or liquid has been spilled into the speaker
   B. The speaker has been exposed to rain or water
   C.  The speaker does not appear to operate normally or exhibits a change in performance
     D. The terminal/cross-over plate has been damaged
APX-152™/APX-PowerPro™                   Main Features
APX-152™ Passive Speaker:
•  Heavy Duty Polypropylene Cabinet
•  Dual 1/4” Phono Jack Connections
•  Dual Speakon Type Connections
•  Built-in Rigging Points
•  LED Peak Indicator
•  Built-in Pole Mount Socket
•  High Output Two-Way System
•  In and Out Jacks for Parallel Connections
•  225 Watts RMS - 900 Watts Peak Power
•  Built-in Heavy Duty Carrying Handle
•  Attached heavy Duty Rubber Feet
APX-Power Pro™ Speaker System:
•  Heavy Duty Polypropylene Cabinet
•  Dual 1/4” Phono Jack Connections
•  Dual XLR Balanced Inputs
•  Built-in Rigging Points
•  Line Level and Mic Level Inputs
•  Built-in Pole Mount Socket
•  Bass and Treble Tone Controls
•  In and Out Jacks for Parallel Connections
•  225 Watts RMS - 900 Watts Peak Power
•  Built-in Heavy Duty Carrying Handle
•  Attached heavy Duty Rubber Feet 
						

							©American Audio®   -   www.AmericanAudio.us   -   APX-152™/APX-PowerPro™   -   Instruction Manual Page 5
APX-152™/APX-PowerPro™                     Registration
APX-152™/APX-PowerPro™                Available Accessories
APX-B - Speaker Carry Case - A rugged gig bag with 
rollers, an adjustable pull out handle, and a heavy duty 
zipper. Designed to protect your speaker from damage 
and  the  environment  during  transportation  and  stor-
Z-APX/B  7  Z-APX/H  -  Speaker  Rigging  Hardware  - 
American Audio® carries an assortment of rigging hard-
ware  specially  designed  to  work  with  the  APX-152™ 
and  the  APX-Power  Pro.™  The  Z-APX/B  is  a  heavy-
duty bolt and may be used to secure the speaker to a 
cable  or  chain.  The  Z-APX/H  is  a  heavy-duty  eyebolt 
and  is  used  to  suspend  or  secure  the  speaker  using 
safety cables.
SPS-1B  &  SPS-2B  -  Speaker  Stands    - American  Audio®carries  two 
types  of  speaker  stands  that  may  be  used  to  raise  the  speakers  during 
use.  The  SPS-1B  is  a  sturdy  aluminum  tri-pod  and  includes  a  mounting 
socket  bracket  for  added  security.  The  SPS-1B  can  raise  the  speaker 
to a maximum height of six feet and has a maximum weight capacity of 
80 pounds. The SPS-2B is a heavy duty version of the SPS-1B, and can 
raise  the  speaker  to  maximum  height  of  six  feet  as  well,  but  has  a  100 
pound capacity. SPS-1B; weight = 6lbs, pipe diameter - 1 3/8” / SPS-2B; 
weight = 8 lbs, pipe diameter = 1 1/2”
The  APX-152™  and  the  APX-Power  Pro™  carry  a  two  year  (730  days)  limited  warranty.  Please  fill 
out  the  enclosed  warranty  card  to  validate  your  purchase.  All  returned  service  items  whether  under 
warranty  or  not,  must  be  freight  pre-paid  and  accompany  a  return  authorization  (R.A.)  number.  The 
R.A.  number  must  be  clearly  written  on  the  outside  of  the  return  package.  A  brief  description  of  the 
problem as well as the R.A. number must also be written down on a piece of paper and included in the 
shipping container. If the unit is under warranty, you must provide a copy of your proof of purchase 
invoice. You may obtain a R.A. number by contacting customer support at (800) 322-6337. All pack-
ages returned to the service department not displaying a R.A. number on the outside of the shipping 
package will be returned to the shipper unopened. 
The serial and model number for this unit is located on the rear panel  Please write down the num-
bers here and retain them for future reference.
Model No.________________________________  Date Purchased___________________________
Serial No.________________________________   Dealer Name______________________________ 
						

							©American Audio®   -   www.AmericanAudio.us   -   APX-152™/APX-PowerPro™   -   Instruction Manual Page 6
APX-152™/APX-PowerPro™               Controls and Features
American Audio®American Audio®American Audio
WARNING: DO NOTsuspend overheadwithout understanding and following theinstructions supplied with the loudspeaker.Nominal Impedence: 8 OhmsPower Capacity: 300 WattsPart No.INPUTOUTPUT1 + = +1 + =-
1
9
10
3
6
7
6
4
6
5
2
3
8
1.HIGH  FREQUENCY  TRANSDUCER  – This  unit  is  used  to  reproduce  the  high  frequency 
response.
2.15”  WOOFER  –  The  high-powered  15”  woofer  is  used  to  reproduce  the  midrange  and  low 
frequencies.
3.RUBBER  FOOT  – The  speaker  includes  heavy-duty  rubber  feet  on  the  bottom  of  the  unit. 
These  feet  are  used  to  secure  a  speaker  to  another  when  stacking.  They  are  also  used  to 
secure the speaker to the ground to prevent it from shifting during heavy bass reproduction.
4.POLE MOUNT SOCKET – This socket is designed to fit a standard speaker pole mount or tri-
pod such as the American Audio® SPS-1B speaker stand.
5.STACKING NOTCHES – These notches are designed to line up with the rubber feet of anoth-
er  APX-152™  or  APX-Power  Pro™  and  are  used  to  support  another  speaker  when  they  are 
stacked together.
APX-152™ & APX-Power Pro™   
						

							©American Audio®   -   www.AmericanAudio.us   -   APX-152™/APX-PowerPro™   -   Instruction Manual Page 7
6.RIGGING  POINTS  –  The  APX-152™  and  APX-Power  Pro™  each  include  four  rigging  points. 
These points are to be used to “fly” or suspend the speaker in the air by some means. Be sure 
to follow the “flying” outlines on page 13.
7.TRANSPORT HANDLE – The APX-152™ and APX-Power Pro™ with built-in heavy-duty trans-
portation  handle.  Be  sure  to  carry  the  speaker  by  the  handle  for  secure  and  easy  transporta-
tion.
Rear Panel (APX-152™ Only):
8.SPEAKON CONNECTIONS –The speaker includes a pair of Speakon type connections. You 
may use both connections at once to loop speakers. These Be sure to use either the Speakon 
type  input  connector  or  the  1/4”  Phono  input  connector  (9),  never  use  more  than  one  input 
connection at once. The Speakon connectors have a pin 1+ (hot) and 1- (ground) configuration, 
pins  2+  and  2-  are  not  used.  For  more  wiring  information  regarding  the  Speakon  connectors 
see page 16.
9.1/4” PHONO JACKS – The speaker includes a pair of standard 1/4” phono jacks. These jacks 
are used for signal input and output. These jacks comes with a special locking clip that must 
be pressed in to release the input plug, this features secures the input plug during heavy bass 
response. The 1/4” jack has a tip positive and sleeve negative configuration. 
10.POLE MOUNT LOCKING PIN – This pin is used to secure the speaker in place when mounting 
the speaker in a pole mount configuration. Always be sure to tighten down on the locking pin 
to prevent the speaker from shifting during use.
APX-152™/APX-PowerPro™               Controls and Features 
						

							©American Audio®   -   www.AmericanAudio.us   -   APX-152™/APX-PowerPro™   -   Instruction Manual Page 8
11.1/4”  BALANCED or UNBALANCED  MICROPHONE  INPUT  JACK  –  This  connector  is  used 
as a microphone input connection. This jack will accept either a balanced or unbalanced input. 
Be  sure  to  only  connect  microphones  to  this  jack,  line  level  devices  such  as  CD  players  and 
tape machines should only be connected to the line level input jacks (12 & 13). Follow the text 
printed beside the jack on the rear panel for proper input wiring.
12.BALANCED  XLR  LINE  INPUT  – This  connection  is  designed  to  accept  a  balanced  line  input 
signal from a mixer or other line level device with a balanced output jack. Use a balanced cable 
when the signal cable length exceeds 15 feet, this will reduce excessive signal loss. Be sure to 
connect only line level input devices such as mixers and tape machines to this jack.
13.1/4”  LINE  INPUT  JACK  –  This  jack  is  used  for  line  level  inputs.  Connect  CD  players  or  Tape 
Decks to LINE inputs. Line level musical instruments with stereo outputs such as Rhythm Ma-
chines or Samplers should also be connected to LINE inputs. 
14.XLR PARALLEL OUTPUT JACK – This jack is used to send the incoming line level signal from 
either of the Line Level Inputs Jacks (12 & 13) to another APX-Power Pro™ or other line level 
input jack such as a tape recorder.
15.MICROPHONE INPUT LEVEL – This knob is used to regulate the output signal of any micro-
FUSE
MIC
LINE
TREBLE
BASS
MASTER
TREBLE
BASS
MASTER
FUSE
11
12
13
14
15
16
17
18
19
20
21
22
23
APX-152™/APX-PowerPro™               Controls and Features 
						

							©American Audio®   -   www.AmericanAudio.us   -   APX-152™/APX-PowerPro™   -   Instruction Manual Page 9
phone  connected  to  the  Microphone  Input  Jack  (11).  However,  overall  master  volume  is  con-
trolled by the Master Volume Control (19).
16.LINE LEVEL INPUT VOLUME – This knob is used to regulate the output signal of any line level 
source  connected  to  the  Line  Level  Input  Jacks  (12  &  13). However,  overall  master  volume  is 
controlled by the Master Volume Control (19).
17.TREBLE CONTROL – This knob is used to regulate the amount treble applied to the output sig-
nal. The maximum amount of treble gain is 15dB and the maximum amount of treble decrease 
is -30dB. Turning the knob in a counter-clockwise direction will decrease the amount of treble 
applied to a channel signal, turning the knob in a clockwise direction will increase the amount 
of treble applied to a channel signal.
18.BASS CONTROL – This knob is used to regulate the amount bass applied to the output sig-
nal.  The  maximum  amount  of  bass  gain  is  15dB  and  the  maximum  amount  of  bass  decrease 
is  -30dB.  Turning  the  knob  in  a  counter-clockwise  direction  will  decrease  the  amount  of  bass 
applied to a channel signal, turning the knob in a clockwise direction will increase the amount 
of bass applied to a channel signal.
19.MASTER VOLUME OUTPUT LEVEL – This knob is used to regulate the master volume output 
level (main volume). To avoid distorted output try to maintain an average output signal level no 
greater  than  +4  dB.  To  avoid  speaker  damage  that  may  be  caused  by  excessive  volume,  be 
sure this slider is always set to zero (completely down) before turning the unit on.
20.LOW CUT FILTER – The Low-Cut fi lter removes extremely low frequencies from the audio sig-
nal that could cause speaker distortion or damage. This switch allows you to enable or disable 
the fi lter.
21.MAIN POWER SWITCH – This is the main power ON/OFF button. A yellow LED directly above 
the power switch will glow indicating power is ON. Before main power is applied, be sure you 
have made all connections to the speaker. Remember to avoid damaging pops to the speakers, 
the mixer is turned on fi rst and turned off last.
22.FUSE  HOLDER  –  This  housing  stores  the  5  amp  GMA  protective  fuse.  Always  replace  with 
the  exact  same  type  fuse,  unless  otherwise  instructed,  by  an  authorized  American  Audio®
service technician. Replacing with any other type of fuse than that of the recommended fuse 
will void your unit warranty.
23.MAIN  POWER  INLET  –  This  connector  is  used  to  supply  main  power  to  the  unit  via  the  in-
cluded detachable power cord. The power connection uses an I.E.C. type connector, use only 
the supplied polarized AC power cord. Use only a power cord that matches this type of con-
nection.  Be  sure  to  only  connect  this  unit  to  a  power  outlet  that  matches  the  printed  power 
label on the unit. Never use a power when the ground prong has been removed or broken off. 
The ground prong is used to reduce the risk of electrical shock in case of an electrical short.  
This cord is designed to fi t in one direction only. Do not attempt to force a cord if it does not 
fi t, be sure the cord is being inserted properly.
APX-152™/APX-PowerPro™               Controls and Features 
						

							©American Audio®   -   www.AmericanAudio.us   -   APX-152™/APX-PowerPro™   -   Instruction Manual Page 10
APX-152™/APX-PowerPro™            Typical Speaker Set-Up
Typical APX-Power Pro™ Output 
MIC1
LINE1PHONO1LINE2PHONO2LINE4LINE3LINE6LINE5
CUECUECUECUE
MIC1VOLUME100BASS100MIDLOW100MIDHIGH100TREBLE100
LEFT+50-5-10-15
MASTERLEVEL
MASTERLEVEL100
BOOTHLEVEL100CUEMIXINGPGMCUECUELEVEL100PHONES
POWER
MIC2VOLUME100
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55555555
ASSIGNCH
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ASSIGNCH
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RIGHT-15-10-50+5
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RISKOFELECTRICSHOCKPASOUVRIR.AVIS:RISQUEDECHOCELECTRIQUE-NECAUTIONDONOTOPENAMERICANAUDIOPREAMPMIXERMODELNO.DX-4AC18V~50/60HZ20W
XLR-XLR Balanced Cables
APX-Power Pro™APX-Power Pro™
FUSE
MIC
LINETREBLE
BASSMASTER
FUSE
MIC
LINETREBLE
BASSMASTER