Installation & User Guide
For Powering
Distributed
Audio Systems
A45-X2
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FEATURES
I Stereo amplifier with 45 watts per channel
I Multiple turn-on modes
I Stable into low impedance loads (2.66 ohms)
Installation friendly design
I 12V DC control output
I Individual input gain controls for each channel
I 3V - 30V AC/DC voltage-trigger
I Cascading outputs
I Automatic protection circuit with front panel indicator
I 5-way Gold plated binding posts for all speaker outputs
I Gold plated RCA jacks
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PRODUCT OVERVIEW
Red “Power” LED confirms the amplifier is connected to a live
AC power outlet. (and that the master power switch is on).
Front panel “Master Power” switch
The red “Protect” LED indicates the amp
has shut down because there is a fault in a
speaker, the wiring, or with the A45-X2 itself.
turns off the entire amplifier, including
the Turn-On circuitry. NOTE: Equipment
is not completely disconnected from
main power source when switch is in
the “off” position.
Main Inputs enable you to route a stereo
line level source to the A45-X2.
Cascade Outputs of the main input enable
you to daisy chain multiple amplifiers.
"Turn-On Mode" switch
3.5mm Mini Plug socket for
voltage input.
3.5mm Mini Plug socket
for 12v DC Control output.
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Green “Active” LED lights when the amplifier circuitry
has been turned on by the Turn-On circuits.
Level Adjustment screws enable you to preset the maximum
system volume (or match levels with another amplifier).
NOTE: AC receptable must be
easily accessible.
Binding posts for speaker connections.
IEC receptacle for AC power cord.
Figure 1
3
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PACKAGE CONTENTS
I A45-X2 x 1
accommodate an open rear, install two
small “boxer fans” to provide continuous
airflow into and out of the cabinet. See
Figure 3. Place the A45-X2 so that there is
at least 5" of free air space above the
chassis. If the amplifier is located on a
carpeted surface, place a board under the
amplifier's feet. Do not block the ventilation
holes on the top and bottom of the A45-X2.
I Removable AC power cord x 1
PREPARING FOR
INSTALLATION
Placement
Place the A45-X2 on a flat level surface like
a table or shelf. It should be placed upright
so that its weight rests on the four attached
feet. Placing the weight of the amplifier on
the rear or front panel may result in damage
to the amplifier's connectors and controls.
If the cabinet rear is not open to fresh
air, install two small “boxer fans”
(55cfm fan) to provide continuous air
flow into and out of the cabinet.
The A45-X2, like any hi-fi component, will
last much longer if it is given adequate
ventilation for proper cooling. When
installing the A45-X2 in a cabinet, be sure
that the rear of the cabinet is open to fresh
air to provide proper cooling. See Figure 2.
If the cabinet’s design will not
Figure 3
TURN-ON MODES
The Turn-On Mode selector switch gives
you three options for turning the A45-X2 on
and off.
Make sure that there is a minimum of
5" of free air space above the amplifier
for proper ventilation.
Allow a minimum of 5" of depth
behind unit to accommodate cables
and connectors.
Slide the switch with your fingernail
or a 1/8" slotted screwdriver blade.
Figure 2
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Constant: The auto turn-on circuitry is off.
The front panel master power switch
operates the amplifier. In is “On”, out is
“Off”.
3. Strip 1/4" of insulation from the end of
each speaker wire. Tightly twist the end
of each wire until no frayed ends remain.
4. Unscrew the Red and Black speaker
wire connectors.
Audio Sense: The master switch on the
front panel must be in the “On” position.
The amplifier is off when there is no audio
signal present at either the left or the right
input, but the sensing circuitry is on. The
turn-on sensing circuitry looks for a tiny
amount of audio signal present at any of the
audio inputs. If it detects a signal, the
5. Insert each wire into the appropriate hole
and tighten the connector until the wire
is securely clamped.
6. Connect the Pre-Amplifier or Receiver
to the RCA connector terminal
labeled: INPUT.
amplifier is turned on. Once the audio signal 7. Set the position of the Turn On Mode
stops, the sensing circuit waits three
minutes, and then turns the amplifier off.
switch. Connect 12 Volt trigger
if applicable.
3-30 Volt AC/DC Trigger Input: The master
switch on the front panel must be in the
“On” position. The amplifier is off when
there is no 3-30V AC or DC voltage detected
at the trigger input. Once the sensing
circuitry detects a voltage and a line-level
audio signal is detected at the input, the
amplifier is turned on. Once the voltage
stops, the sensing circuit instantly turns the
amplifier off. Voltage trigger can be supplied
by connecting a 12Volt AC wall adapter to
the switched outlet of your stereo receiver.
DO NOT USE A DC WALL ADAPTER. The
long discharge time of the DC adapter’s
filter capacitor will delay the turn-off of the
amplifier.
8. Connect the AC power cord to the A45-
X2, and then plug it into an “Un-
switched” AC outlet.
9. Turn the Master Power switch on. The
switch is located on the front panel
of amplifier.
Control Output
This terminal provides a 12Volt DC signal
suitable for triggering automated switchers,
motorized screens, some electric curtain
controls, etc. The trigger voltage is present
only when the amplifier is active or “On”.
When the amplifier turns “Off”, the 12-Volt
signal is off.
Cascade Audio Outputs
TOOLS REQUIRED
I 1/8" Slotted screwdriver
I Wire stripper
The “Cascade Audio Outputs” enable you
to connect another amplifier to your
preamplifier output. The connectors are
gold-plated RCA phono jacks. Connect them
to another amplifier’s inputs with a standard
audio patch cable. The outputs are not
buffered; if you wish to daisy chain more
than 3 JobSite amplifiers you will need a
buffered distribution amplifier.
I Wire labels
INSTALLATION
1. Select an appropriate location for the
A45-X2
2. Run all the necessary wiring to the A45-
X2. Label the wires for future reference.
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Hum from the speakers
Level Adjustment Screws
Hum may be caused by a ground loop
between two of the other components in
the system. To test for a ground loop, try
reversing the ac plugs of each of the
components in the system. Check for
faulty cables, faulty source material, an
ungrounded phono system or a
The front panel level adjustment screws
allow you to adjust the level of the A45-X2,
relative to other amplifiers in your system.
Use a 1/8" slotted screwdriver to adjust the
screws. If the A45-X2 is the only amplifier in
your system, leave the screws at their
factory default position (turned fully
clockwise).
defective component.
Amp will not turn on
TROUBLESHOOTING
AC power cord must be plugged into a
working outlet.
No sound on one channel
You could have a short circuit or loose wire
at the speaker or amplifier terminals. Check
that the connections are secure and that
there are no loose strands of wire crossing
from the positive to the negative terminals
at the back of the amplifier and/or the
speaker.
Master power switch must be on. 12V
trigger must be present.
Bass sound is weak and the
stereo image is “phasey” or
“blurry” sounding in one room
The loudspeakers are wired out of phase.
Reverse the connections at the back of
one speaker.
Short circuit or a break in the speaker wire.
Disconnect the speaker wire at both ends,
separate the 2 conductors at both ends and
test with a meter for a short circuit. If there
is no short, connect the two conductors at
one end and test with a meter for continuity.
SPECIFICATIONS
Power handing:
45 watts x 2
Frequency response:
10 Hz to 100 kHz +/- 3dB
Speaker is not working
Signal noise ratio:
>= 85dB
Connect the speaker to a channel that plays
another speaker.
Power supply
AC120V, 60 Hz
Audio cable to input is bad
Connect another cable that is known
to be good.
Power consumption
200 watts
No sound on both channels
Dimensions:
17" wide x 2-5/16" high (including feet)
x 13-1/8" deep
Audio cable to the main inputs is bad.
Connect another cable that is known
to be good.
Warranty: 2 year limited
Active LED ON or OFF
Check trigger mode 12V trigger voltage.
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REPAIR OR REPLACEMENT AS PROVIDED UNDER THIS
WARRANTY IS THE EXCLUSIVE REMEDY OF THE
CONSUMER/PURCHASER. NILES SHALL NOT BE
RESPONSIBLE FOR ANY INCIDENTAL OR
CONSEQUENTIAL DAMAGES EXCEPT TO THE EXTENT
PROVIDED (OR PROHIBITED) BY APPLICABLE LAW.
LIMITED WARRANTY
JobSite Systems (“JOBSITE”), a Niles Audio Corporation
company, warrants its passive products (those not
requiring AC or battery power) to the original purchaser
to be free of manufacturing defects in material and
workmanship for a period of ten years from date of
purchase.
Some states do not allow the exclusion or limitation of
incidental or consequential damages, so the above
limitation may not apply to you. This warranty gives you
specific legal rights, and you may also have other
rights, which vary from state to state.
JOBSITE warrants its passive loudspeaker products
(those not requiring AC or battery power) to the original
purchaser to be free of manufacturing defects in
material and workmanship for a period of five years from
date of purchase.
For the name of the nearest authorized JOBSITE
wholesale distributor, contact:
JOBSITE warrants its indoor/outdoor loudspeaker
products to the original purchaser to be free of
manufacturing defects in material and workmanship for
a period of two years from date of purchase.
JobSite Systems
12331 S.W. 130 Street, Miami, Florida 33186
WWW.JOBSITESYSTEMS.COM
JOBSITE warrants its all weather rock loudspeaker
products to the original purchaser to be free of
manufacturing defects in material and workmanship for
a period of five years from date of purchase.
JOBSITE warrants its active products (those requiring
AC or battery power) to the original purchaser to be free
of manufacturing defects in material and workmanship
for a period of two years from date of purchase.
This Warranty is subject to the following additional
conditions and limitations. The Warranty is void and
inapplicable if JOBSITE deems that the product has
been used or handled other than in accordance with the
instructions provided by the manufacturer, including, but
not limited to, damage caused by accident, mishandling,
improper installation, abuse, negligence, or normal wear
and tear, or any defect caused by repair to the product
other than by JOBSITE or an authorized JOBSITE
wholesale distributor.
To obtain warranty service, you must write to JOBSITE:
Include your name, address, telephone number, model
number and serial number of your unit, and a brief
description of the problem.
A factory Return Authorization Number will be sent to
you. DO NOT RETURN ANY UNIT WITHOUT FIRST
RECEIVING WRITTEN AUTHORIZATION AND SHIPPING
INSTRUCTIONS FROM JOBSITE.
If the above conditions are met, the purchaser’s sole
remedy shall be to return the product to JOBSITE, in
which case JOBSITE will repair or replace, at its sole
option, the defective product without charge for parts or
labor. JOBSITE will return the unit repaired or replaced
under warranty by shipping it by its usual shipping
method from the factory (only) at its expense within the
United States of America. THERE ARE NO OTHER
WARRANTIES, INCLUDING, WITHOUT LIMITATION,
EITHER EXPRESS OR IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE, WITH RESPECT TO THE PRODUCT.
7
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NOTES:
8
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NOTES:
9
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JOBSITE SYSTEMS
12331 S.W. 130 STREET, MIAMI, FLORIDA 33186
P 866.4JB.SITE (866.452.7483) – F 305.238.0185
WWW.JOBSITESYSTEMS.COM
© 2005 JobSite Systems. All rights reserved. JobSite, Pure Custom and Niles are registered trademarks of Niles Audio Corporation and the
JobSite Logo is a trademark of Niles Audio Corporation. All other trademarks are the property of their respective owners. Some JobSite products
(or components thereof) are manufactured under one or more U.S. Patents, foreign equivalents and/or pending patents (see product for details).
Because we constantly strive to improve our products, JobSite reserves the right to change product specifications, descriptions, and prices
without notice. The technical and other specifications of information contained herein are not intended to set forth all technical and other
specifications of JobSite products. Additional information can be obtained at WWW.JOBSITESYSTEMS.COM or by calling JobSite at
866.452.7483. Printed in Malaysia. 6/05 DS00374BMY
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