INSTALLATION & USER GUIDE
For Powering
Distributed
Audio Systems
A30-X12
12DCoHwAnlNoaNdEfrLomPOWWwwE.SRoAmManPuaLlsIF.cIoEmR. All Manuals Search And Download.
FEATURES
I 12 independent amplifiers with 30 watts per channel
I Assignable buss and dedicated input for each channel
I Multiple turn-on modes
I Adjacent bridgeable channels (80 watts)
I Stable into low impedance loads (2.66 ohms)
I CSA listed and tested under UL6500 standards
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
1
PRODUCT OVERVIEW
Red “Power” LED confirms the amplifier is connected
to a live AC power outlet and that the front panel
master power switch is on.
Green “Active” LED lights
when the amplifier circuit
has been turned on by the
Turn-On circuits.
Front panel “Master Power”
switch turns off the entire
amplifier, including the auto
turn- on circuitry.
NOTE:This piece of equipment
is not completely disconnected
from the main power source
when the Master Power Switch
is in the OFF position.To com-
pletely disconnect unit from AC
power, remove the removable
AC Power Cord.
Cascade outputs of the main
bus input enable you to daisy
chain multiple amplifiers.
Main Bus Inputs enable you
to route a stereo line level
TM
source to the BusMatrix
3
4
5
of the A30-X12.
MAIN
BUS
CASCADE
BUS
INPUT
OUTPUT
R
R
“Turn-On” Mode Switch
3
4
5
3.5 mm Jack for
12v DC Control Input.
3.5 mm Jack for
12v DC Control Output.
2
s
try
e
Red “protect” LED
indicates a fault
condition (D.C. output).
Attractive extruded
aluminum front panel.
Bridging switches, BusMatrix controls, dedicated
inputs and level controls for each channel.
Gold-plated
RCA jacks
6
7
8
9
10
11
12
6
7
8
9
10
11
12
Dual banana spaced binding
posts for speaker connections.
Removable Two-prong
16 gauge 6’ AC power cord.
3
PACKAGE CONTENTS
The A30-X12, like any hi-fi component, will
last much longer if it is given adequate
ventilation for proper cooling. When
installing the A30-X12 in a cabinet, be sure
that the rear of the cabinet is open to fresh
air to provide proper cooling (see Figure 1).
If the cabinet’s design will not
I A30-X12 x 1
I Removable AC power cord x 1
PREPARING FOR
INSTALLATION
accommodate an open rear, install two
small “boxer fans” to provide continuous
airflow into and out of the cabinet (see
Figure 2). Place the A30-X12 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 A30-X12.
Place the A30-X12 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.
Figure 1
Figure 2
If the cabinet rear is not open to fresh
air, install two small “boxer fans” to
provide continuous air flow into and
out of the cabinet.
Make sure that there is a minimum of 5”
of free air space above the amplifier and
3” on each side for proper ventilation.
Allow a minimum of 2” of depth behind unit
to accommodate cables and connectors .
4
BridgingTwo Channels
into One
Turn-On Modes
The Turn-On Mode selector switch gives
you three options for turning the A30-X12 on
and off. See figure 5
The A30-X12's bridging switches allow you
to create a more powerful amplifier channel
by combining or "bridging" two adjacent
channels.
Slide the bridging
switch in the
direction of the
1
2
BRIDGED
arrow to bridge two
adjacent amplifier
channels. Set the
controls of the
newly bridged pair
by using the EVEN
numbered channel.
Slide the switch with your
fingernail or a 1/8” slotted
screwdriver blade.
LEVEL
LEVEL
USE CH 2
WHEN
BRIDGED
L
R
L
BUS
BUS
R
Figure 5
L+R
1
L+R
2
Constant: The auto turn-on circuitry is off.
The front panel master power switch
operates the amplifier. In is "On", out is "Off".
When two channels
are bridged together,
connect speakers to
the two terminals
+
-
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 amplifier is
turned on. Once the audio signal stops, the
sensing circuit waits three minutes, then
turns the amplifier off.
labeled “Bridged”.
BusMatrix Input Switch Setting
Each channel has a dedicated BusMatrix
DIP switch that assigns that channel’s
source. To assign a signal from the Main
Bus Input, select one of the first three
switches, which will give you Left (L), Right
(R) or Mono (L+R). To assign the channel’s
dedicated input select the fourth switch.
Only ONE switch should be selected to the
“ON” position.
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 12 Volt 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.
“OFF”Position “ON” Position
MAIN
BUS
INPUT
L
R
L+R
1
L
BUS
R
5
ConfiguringYour System
6. Connect the Pre-Amplifier or Receiver to
the predetermined Channel Inputs, using
the configuration worksheet as the guide.
Because the A30-X12 offers so many
configuration possibilities it is important to
plan carefully before you install it. Draw a
block diagram of your system and use the
Configuration Worksheet on page 7 to
record how you plan to connect your
A30-X12. Here is an example filled out
according to the block diagram on page 7.
Mark the cables with Wire labels,
7. Set the BusMatrix input switch setting for
each channel.
8. Set the position of the Turn On Mode
switch. Connect 12 Volt source if
applicable.
9. Connect the AC power cord to the A30-
X12, and then plug it into an “Un-
switched” AC outlet.
describing where the cables originate from,
rather than where they will terminate.
10. Turn the Master Power switch on. The
switch is located on the front panel of
amplifier.
Tools Required:
I 1/8" Slotted screwdriver
I Wire stripper
Control Output
I Wire labels
This terminal provides a 12-Volt 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 12Volt
signal is off.
INSTALLATION
Complete configuration
worksheet
1. Select an appropriate location for the
A30-X12
Cascade Audio Outputs
2. Run all the necessary wiring to the A30-
X12. Label the wires for future reference.
The "Cascade Audio Outputs" enable you to
connect another amplifier to your
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.
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.
4. Unscrew the Red and Black speaker wire
connectors.
5. Insert each wire into the predetermined
Speaker Outputs, using the configuration
worksheet as the guide. Tighten the
connector until the wire is securely
clamped.
Level Adjustment Knobs
The rear panel level adjustment knobs allow
you to adjust the maximum output level of
any channel individually.
6
OPERATION
Power LED
D.C. Protection
In the event a damaging D.C. signal
becomes present on any of the speaker
terminals, the D.C. protection circuit shuts
down the entire amplifier and the red LED
labeled “Protection” illuminates. To reset
the amplifier you must turn the front panel
power switch “off” and then “on.”
The power LED indicates that the AC cord
is plugged into a working AC power
receptacle and that the power switch is in
the "On" position.
Active LED
The rear panel turn-on mode switch
determines when and how the amplifier will
turn on. The "Active" LED indicates that the
amplifier is on.
Listening at Higher Volumes
Thirty watts is enough power to play a
conventional speaker in a normal sized
room loudly enough to completely drown
out conversation. Even at levels like that,
the A30-X12 will sound clear and clean.
However, it requires more power to achieve
a reasonable volume of sound in a large
room than it does in a small room. It is
possible to turn the volume so high that the
amplifier runs out of power. This creates
"clipping" distortion.
Power Switch
The front panel switch is a master or
"vacation" power switch. No matter which
turn-on mode you have selected, the
master power switch will turn off all
circuitry—including the sensing circuitry.
If you are going on vacation and/or would
like to reduce power consumption while
you are away, turn the master power
switch “off” (push the rocker switch out).
When you would like to return to normal
operation, turn the switch "On" (push the
rocker switch in).
Clipping distortion makes treble sound very
harsh and unmusical. When you hear harsh
sounding treble from any good speaker, turn
the volume down immediately!
If you continue to operate the amplifier at
"clipping" power levels the protection
circuits will operate when the amplifier
overheats. The protection circuits reset
when the amplifier's internal circuitry cools.
Reduce the volume to prevent a
reoccurrence. Perpetually overdriving your
speakers and amplifier is abuse and
probably voids the manufacturer’s warranty
of all affected products.
NOTE: This piece of equipment is not
completely disconnected from the main
power source when the Master Power
Switch is in the OFF position. To
completely disconnect unit from AC power,
remove the removable AC Power Cord.
7
TROUBLESHOOTING
Check for faulty cables, faulty source
material, an ungrounded phono system,
cable TV feed or a defective component.
No sound on one channel
BusMatrix DIP switch is not in the correct
position. Check your configuration
worksheet for the correct setting and verify.
Amp will not turn on
AC power cord must be plugged into a
working outlet.
You could have a short circuit or loose wire
at speaker or amplifier terminals. Check that
connections are secure and that there are
no loose strands of wire crossing from the
positive to the negative terminal at the back
of the amplifier and the speaker.
Master power switch must be on.
Test that the AC power receptacle is
working. If the outlet tests O.K., the internal
fuses are blown. Return the amplifier to
your dealer for service.
Audio cable to dedicated input is bad.
Connect the non-working channel input to
another cable that is known to be good.
Sound is distorted on one or
all of the channels at normal
volumes
Bridging Switch is in the wrong position.
Check your configuration worksheet for the
correct setting and verify.
BusMatrix DIP switches are not in the
correct positions. Check your configuration
worksheet and verify all settings.
The thermal protection circuit has operated
because of overheating caused by
overdriving or inadequate ventilation.
Normal volume cannot be
reached
One of the internal amplifier fuses is blown.
No sound on some or all
channels
(Return the amplifier to your dealer for
service).
BusMatrix DIP switches are not in the
correct positions. Check your configuration
worksheet and verify all settings.
Bass sound is weak and the
stereo image is “phasey”
sounding in one room
Audio cable to the main bus inputs is bad.
Connect the non-working channel input to
another cable that is known to be good.
Check that the bridging switch is “Off”. If
two adjacent channels are connected
normally but the bridging switch is set to
the “Bridged” position, the two speakers
will play out of phase with each other.
Some or all of the internal
amplifier fuses are blown.
(Return the amplifier to your dealer for
service).
The loudspeakers are wired out of phase.
Reverse the connections at the back of
one speaker.
Hum from all of the speakers
Hum may be caused by a ground loop
between two components in the system. To
test for a ground loop, try reversing the ac
plugs of each of the components in the
system, that has non-polarized plugs.
8
CONFIGURATION WORKSHEET
BUS INS & OUTS
CONNECTED TO
Left Main Bus
Right Main Bus
Cascade Output
CH # BRIDGED
DIP
INPUT SOURCE
SPEAKER
1
2
3
4
5
6
7
8
9
10
11
12
MODE SETTINGS
IN USE
SPECIAL CONNECTIONS OR NOTES
Constant
Audio Sense
Voltage Trigger
Control Output
9
SPECIFICATIONS
Power handing:
30 watts x 12
Frequency response:
5 Hz to 50 kHz +/- 3dB
Signal noise ratio:
>= 85 dB
Power supply
AC120V, 60 Hz
Power consumption
9 amps
Dimensions:
17” wide x 5-1/2” high (including feet) x
15” deep
Warranty: 2 year limited
10
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.
11
NOTES:
12
NOTES:
13
JOBSITE SYSTEMS
12331 S.W. 130 STREET, MIAMI, FLORIDA 33186
P 866.4JB.SITE (866.452.7483) – F 305.238.0185
WWW.JOBSITESYSTEMS.COM
© 2004 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. 7/04 DS00373BMY
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