Sherbourn PA 12-45 User manual

Important Safety Precautions and Explanation of Symbols
The exclamation point within an equilateral triangle is intended to alert the user to the presence of
important installation, operation, and service instructions in this manual.
The lightning ash with arrowhead symbol within an equilateral triangle is intended to alert the user
to the presence of uninsulated dangerous voltages within the enclosure that may be of sufcient
magnitude to constitute a risk of electrical shock to the user.
Please read this Installation and Operation Manual thoroughly before attempting to install, congure,
or operate the PA 12-45. After successful installation and conguration of the PA 12-45, be sure to
retain this manual in a safe place for future reference.
Safety is a key component to a long lasting and trouble free installation. Please read and follow all
instructions and heed all warnings on the PA 12-45 and in this manual. If you are not comfortable with
the installation of audio/video entertainment equipment, you should seek the services of a qualied
installation professional or call us for help.
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT USE THE
PA 12-45 NEAR WATER OR IN WET LOCATIONS, DO NOT EXPOSE IT TO RAIN OR MOISTURE,
DO NOT EXPOSE IT TO DRIPPING OR SPLASHING FROM OTHER SOURCES, AND ENSURE
THAT NO OBJECTS FILLED WITH LIQUIDS (SUCH AS VASES) ARE PLACED ON IT. DOING SO
MAY RESULT IN DAMAGE TO THE PA 12-45 AND CREATE THE RISK OF ELECTRIC SHOCK,
WHICH MAY RESULT IN BODILY INJURY OR DEATH.
WARNING: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE THE COVER
FROM THE PA 12-45. THERE ARE NO USER-SERVICEABLE PARTS INSIDE THE PA 12-45.
REFER ALL SERVICE TO QUALIFIED SERVICE PERSONNEL.
To reduce the risk of electrical damage, verify that no short circuits are present between terminals and/
or speaker wires before applying power.
Do not install the PA 12-45 near or above any heat sources such as radiators, heating vents, or other
apparatus that produces heat. Do not block any ventilation openings or heat sinks. Avoid installing
the PA 12-45 directly above other heat-producing equipment, unless sufcient ventilation or forced-air
cooling is provided.
Do not install the PA 12-45 in locations without proper ventilation. The PA 12-45 should not be
operated on a bed, sofa, rug, or similar surface that may block vents. The PA 12-45 should not be
installed in an enclosed location such as a bookcase, cabinet, or closed equipment rack, unless
sufcient forced-air ventilation is provided.
Connect the PA 12-45 to power sources only of the correct voltage, as shown in this manual and on
the PA 12-45. Ensure that the Input Voltage selector switch on the rear of the PA 12-45 is set to the
appropriate voltage.
Protect power supply cables from being pinched, walked on, or otherwise damaged. Be especially
careful where the power cable enters the power outlet of the PA 12-45 unit.
Only connect the PA 12-45 to an electrical outlet or extension cord of appropriate type and rating. DO
NOT defeat the safety purpose of a grounding or polarized plug by removing ground pins or using
unsafe adapters. A polarized plug has two blades - one wider than the other. A grounding plug has a
third ground prong in addition to the two main conductors. The wide blade or third groundling prong is
provided for your safety. If the provided plug does not t your outlet, consult an electrician to replace
your obsolete outlet. If you replace the PA 12-45 power cord, only use one of similar type of equal or
greater current rating.
!
!

The power cable for the PA 12-45 should be unplugged from the outlet during severe electrical storms
or when unused for a long period of time.
Only replace the fuse in the PA 12-45 with a fuse of proper value and voltage rating.
The PA 12-45 should only be cleaned as directed in the Installation and Operation Manual. Avoid
spraying liquids directly onto the PA 12-45 and never spray liquids into the vents. Care should be
taken so that small objects do not fall into the inside of the PA 12-45.
You should seek service for your PA 12-45 by qualied service personnel if any of the following occur:
1. The power-supply cord or the plug has been damaged.
2. Objects or liquid have fallen or spilled into the vents.
3. The PA 12-45 has been exposed to rain.
4. The PA 12-45 exhibits a marked change in performance.
5. The PA 12-45 has been dropped or its enclosure or chassis is damaged.
NOTE: TO COMPLETELY DISCONNECT THE PA 12-45 FROM THE AC POWER MAINS,
DISCONNECT THE AC POWER CORD FROM THE AC RECEPTACLE.
NOTE: THE PA 12-45’s AC POWER CORD MUST REMAIN READILY ACCESSIBLE AT ALL
TIMES.
FCC Interference Statement
Note: This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This equipment generates, uses, and can
radiate radio frequency energy and, if not installed and used in accordance with the instructions,
may cause harmful interference to radio communications. However, there is no guarantee that the
interference will not occur in a particular installation. If this equipment does cause harmful interference
to radio or television reception, which can be determined by turning the equipment off and on, the user
is encouraged to try to correct the interference by one or more of the following measures:
1. Reorient or relocate the receiving antenna.
2. Increase the separation between the equipment and receiver.
3. Connect the equipment into an outlet on a circuit different from that of the receiver.
4. Consult the dealer or an experienced radio/TV technician for help.
For questions regarding service, please contact:
Sherbourn Technologies, Inc.
131 SE Parkway Court
Franklin, Tennessee
37064
Tel: [phone]
Fax: [phone]
Web: www.sherbourn.com
!
CAUTION
CAUTION: TO REDUCE THE RISK
OF ELECTRICAL SHOCK, DO
NOT REMOVE COVER. NO USER
SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED
SERVICE PERSONNEL.

Page 1
Contents
Important safety precautions and explanation of symbols
Introduction.................................................................................................2
The PA 12-45..............................................................................................2
About this manual.......................................................................................2
Mechanical and environmental...................................................................3
Inputs and outputs......................................................................................4
Installation tips............................................................................................5
Conguration ..............................................................................................6
Performance specications ........................................................................9
Features ...................................................................................................10
Operation..................................................................................................11
Periodic maintenance...............................................................................12
Troubleshooting........................................................................................13
Sherbourn Technologies, LLC Ten-Year Limited Warranty.......................14
Notes ........................................................................................................15
PA 12-45
12-CHANNEL DISTRIBUTED AUDIO AMPLIFIER

Page 2
Introduction
Thank you for choosing the PA 12-45 12-Channel Distributed Audio Amplier.
The PA 12-45 combines 12 exceptionally sounding audio channels, tremedous input exibility, user-
selectable AC supply voltage, and a trigger input and output - all in one convenient package.
Design features like our proven discrete class A/B technology, Sherbourn’s intelligent protection
system, and true commercial grade construction quality and reliability make the PA 12-45 the right
choice for your distributed audio needs.
Thank You!
The Sherbourn Team
About This Manual
This manual will provide you with all the information you need to install and congure the PA 12-
45 to achieve its optimum potential. This manual also includes a brief summary of the features
offered by the PA 12-45, a short description of how the controls work, and how to perform common
operations.
You may wish to record serial numbers or other purchase information on the Notes page at the back
of this manual.
The PA 12-45
The PA 12-45 provides 12 independent channels of audiophile quality, class A/B power
amplication-nominally arranged into six stereo zones. Each channel can receive signal either from
one of two input busses or from its own independent input, and each has its own independent, rear-
panel, volume control. Each channel pair can optionally be bridged into a single higher-powered
channel.
Each of the two stereo input busses can be congured to feed as many zones as required, and
can also feed a matching stereo set of output pass-through connectors. The PA 12-45 offers both
a power trigger input and a trigger output, and can also be triggered on by the presence of audio
signal at its inputs. Speaker connections are via full-sized ve way binding posts. Power can be
either 115 VAC or 230 VAC, and is via a convenient removable IEC power cord.

Page 3
Mechanical and Environmental
17”
19”
15”
3-3/8”
14”
5.25”
TOP
FRONT
SIDE
1/16”
5.75”
RACK HANDLES
SHERBOURN PA 12-45
Dimensions: 17” wide x 5.75” high x 15” deep (includes feet, binding posts, no rack ears)
Weight: 28 lbs / 12.7 kg (unboxed); 35.9 lbs / 16.3 kg (boxed)
Rack mountable: Yes, with optional Rack Handles / Brackets
Power requirements:
115 VAC or 230 VAC +/- 10% @ 50 / 60 Hz (selectable by rear-panel switch)
Power consumption: Pp to 500 watts under maximum load
Ventilation and cooling:
To avoid overheating, be sure to provide adequate clearance and ventilation, top and bottom.
PA 12-45

Page 4
Inputs and Outputs
Analog inputs:
2 bus inputs (bus 1, bus 2); each bus has one stereo pair of unbalanced (RCA) inputs
12 individual channel inputs; each channel has one unbalanced (RCA) input
Input sensitivity (for full output into 8 ohms):
365 mV
Speaker outputs:
12 pairs of 5-way binding posts (standard red and black); one pair per channel
(in bridge mode, speakers are connected to the red binding posts of both channels in the zone)
Minimum recommended load impedance:
Individual channels: 4 ohms (one 4 ohm load or two paralleled 8 ohm loads per channel)
Bridged mode: 8 ohms minimum load per bridged channel
Trigger and control:
Trigger Input (mono 1/8”), Trigger Output (mono 1/8”)
Front panel controls and indicators:
On / Off (large push button); toggles between Standby mode and On mode
On / Off LED (1); red indicates Standby mode; blue indicates normal operation
Zone Status LEDs (6); blue indicates normal operation; ashing blue indicates a fault
(each LED indicates the status of one zone (channel pair))
(Zone Status LEDs are not lit in Standby mode)
Rear panel controls and indicators:
Power (rocker switch); switches main power
Input Voltage (protected slide switch); selects 115 or 230 VAC line voltage
Power Mode slide switch (Auto / On / Triggered)
Bridge Mode switch (6); labelled BR / ST for Bridge / Stereo (Independent) mode
one per zone / pair of channels; congures each zone / channel pair
as either two separate output channels (Stereo) or one bridged output channel
Line In switch (12); one per channel; selects the input source for the channel
(Bus 1, Bus 2, or individual input).
In bridged mode, only one input is active per bridged pair of channels.
Volume (12); sets input level / gain for each channel
In bridged mode, only one Volume control is active per bridged pair of channels
(the input and controls from the odd numbered channel are active)
AC power input:
IEC C17/C18 (10/15A two wire) type inlet and power cord
AC Power line fuse (rear panel holder)

Page 5
Installation Tips
Input Busses and Individual Inputs
The system of input busses and individual inputs on the PA 12-45 offers an amazing amount of
exibility. The PA 12-45 can be congured as any of the following:
• Twelve separate channels, each with an individual input and level/gain control
• Six zones (stereo pairs of channels), each pair deriving its input either from individual inputs or
from one of two stereo busses, and each with an individual level/gain control
• Six high-powered channels, each deriving its input from either an individual input or a bus, and
each with an individual level/gain control
• Even more creative and complex congurations are possible, limited by your imagination.
• Note: Remember that the busses feed the channels as stereo pairs, so the odd numbered
channels (CH1, CH3, CH5, CH7, CH9, CH11) are fed by the Right input from the Bus, while
the even numbered channels (CH2, CH4, CH6, CH8, CH10, CH12) are fed by the Left input
fromthebus.WhenapairofchannelsisinBridgedmodeandisconguredtoreceiveits
input from Bus 1 or Bus 2, it receives its signal from the Right input of that bus. When a
pairofchannelsisinBridgedmode,andisnotconguredtoreceiveitsinputfromabus,
the Input, Input selector switch, and Volume control on the odd numbered channel input
of the pair are active and those on the even numbered channel input are ignored.
Ventilation and cooling
Even though the PA 12-45 is quite efcient, it can still produce signicant heat; to avoid overheating,
be sure to provide adequate clearance and ventilation. Overheating adversely affects performance
and shortens component life. We suggest locating components that produce the most heat towards
the top of your rack, if practical, and leaving at least 1U (1.75”) of rack space between components.
Space between components can be left open for ventilation, lled with a spacer, or used to house a
forced-air cooling solution.
The C-12 Flex Rack™ Cooling System uses whisper quiet high capacity variable speed fans to
provide over 100 CFM of forced air cooling for rack installations. The C-12 offers a variety of air-
ow options (including external ducting), includes professional features like triggered operation and
thermostatic control, and takes up only 2U of rack space.

Page 6
Conguration
Operating Voltage - Verify that the PA 12-45 is congured for the correct operating voltage for your
area. Voltage is set via the Input Voltage switch on the rear panel of the PA 12-45.
Power Mode - The way in which the PA 12-45 responds to the Trigger Input, audio signals, and the
front panel On/Off switch is determined by the setting of the Power Mode switch (the small slide
switch on the rear panel next to the Trigger In and Trigger Out connectors). The Trigger Output on
the PA 12-45 is controlled only by the status of the PA 12-45, and will be active (high) whenever the
PA 12-45 is On and not in Standby mode. When the rear panel Power rocker switch is set to Off, the
PA 12-45 is powered completely off and will not respond to any other control, switch setting, or input,
and the Trigger Output will be off. In order for the PA 12-45 to operate as described below, the rear
panel Power rocker switch must be set to On.
• When the Power Mode switch is set to On, the PA 12-45 is controlled by the front panel On/Off
switch, which toggles between Standby mode and On each time it is pressed.
• When the Power Mode switch is set to Auto, the PA 12-45 is controlled by audio input. The PA
12-45 switches On when there is an audio signal present at any of the inputs which will occur
even when audio arrives at an input that is not assigned to any channel as a source. The PA
12-45 will return to Standby mode about fteen minutes after audio input signal is no longer
present.
• When the Power Mode is set to trigger, the PA 12-45 will switch On when a trigger signal is
received and will return to Standby mode when the Trigger signal is no longer present.
Note: Always switch the PA 12-45 Off and then back On using the REAR PANEL POWER
SWITCH after changing the setting of the Power Mode switch
Zone and Input Conguration - The PA 12-45 is arranged as six zones, with two channels in each
zone. The two channels in each zone may optionally be bridged into a single high-powered channel.
The Bridge/Stereo selector switch (BR/ST) for each zone determines whether that zone acts as two
independent channels or a single bridged channel.
Note: Speakers must be connected differently depending on which way the Bridge/Stereo
switch is set. Please ensure that both the Bridge/Stereo switch setting and the wiring
congurationofyourspeakersforeachchannelarecorrectandconsistentbeforeturningon
the PA 12-45. Failure to do so may result in unexpected behavior and possible damage to the
PA 12-45.
Bus Inputs and Outputs - The PA 12-45 has two
stereo Input Buses - Bus 1 and Bus 2.
If one or both channels in a zone are congured
to use a particular bus as an input source, then
the appropriate input signal is routed to that
channel (odd numbered channels receive the
Right bus input; even numbered channels receive
the Left bus input). If the zone is congured as
Bridged, then the Right Input for that bus (also labeled BR xin) is used as the signal source
for the bridged channel and the Left Input signal is ignored.
When the PA 12-45 is On, the signal present at each Bus Input connector is buffered and is
available at the corresponding Bus Output connector.
BR 1in 1
BR 2in 2
RIGHT LEFT
BUS
INPUT

Page 7
Bridge
+
Bridge
-
SPEAKER
Line InLine In
Shaded Area is for Bridging
Bus
1 2 Line In
Bus
1 2 Line In
BR ST VolVol
Ch 5 ZONE 3 Ch 6
+ +
Conguring a Stereo or Independent Channel Zone - Independent channels may be connected
to a minimum load impedance of 4 ohms. To congure the two channels in a zone as a stereo pair,
or as independent channels, set the Bridge/Stereo switch to ST and connect one speaker to each of
the left and right pairs of binding posts (as shown below).
With the zone congured this way, each amplier is independent and is controlled by its own
separate Volume control. The Input Selector switch (also independent for each channel) is used to
select an input source for that channel. If Line In is selected, then the unbalanced (RCA) input jack
directly below the switch is used as the signal source for that channel. If Bus 1 or Bus 2 is selected,
then the selected Input Bus is used as the signal source.
Note: The channel inputs assume a stereo relationship between the channels and the input
busses. When a given bus is selected as the source for a particular channel, odd numbered
channels will receive input from the Right Input for the chosen bus and even numbered
channels will receive input from the Left Input for the chosen bus. That way, if you select
a certain bus as the source for both channels in a zone, the two channels in that zone will
provide a stereo output that corresponds to the stereo input signal on the chosen bus.
In the gure below, with the switches set as shown, and a stereo source connected to Input Bus 2,
the speakers will be playing the signal from Input Bus 2, in stereo, with the right channel on Channel
5 and the left channel on Channel 6.
Note: Since the input for each channel can be chosen independently, it is possible to create
congurationswhereinputsotherthanstereopairsareconnectedtothe“left”and“right”
inputsofonebus,andareroutedindependentlytovariousamplierchannels.Ifthisisnot
your express intent and you are using stereo inputs and outputs, then be sure to set BOTH
Input Selector switches on each zone to the same source when using stereo busses.

Page 8
Bridge
+
Bridge
-
SPEAKER
Line InLine In
Shaded Area is for Bridging
Bus
1 2 Line In
Bus
1 2 Line In
BR ST VolVol
Ch 5 ZONE 3 Ch 6
+
Conguring a Bridged Zone - Bridged channels may be connected to a minimum load impedance
of 8 ohms. To congure the two channels in a zone as a Bridged channel, set the Bridge/Stereo
switch to BR and connect one speaker to the TWO RED BINDING POSTS (as shown below).
Note:ThepolaritymarkingsthatpertaintoBridgedmodearethesmall“Bridge+”and
“Bridge-”markednexttothetworedbindingposts.InBridgedmode,ignorethepolarity
markings located between the left and right sets of binding posts. In Bridged mode, the two
black binding posts remain UNUSED.
With the zone congured this way, the zone acts as a single amplier channel with much more
power than each individual channel. The shaded background shows which controls and connectors
are active in Bridged mode (the controls from the odd numbered channel are active in this
conguration and those in the even numbered channel are ignored). The Volume control from the
odd numbered channel is used to control gain, and the Input Selector switch from that channel is
used to select the input source. If Line In is selected, then the unbalanced (RCA) input jack directly
below the active (odd numbered channel) switch is used as the signal source for that channel. If
Bus 1 or Bus 2 is selected, then the RIGHT input for the selected bus is used as the source of input.
(That input is also labeled “BR In” on the Input Bus panel).
Note:Rememberthat,inBridgedmode,the“Rightchannel”(oddnumberedchannel)
controls and inputs are active (note the shading on the panel) and the Left channel inputs
and controls are ignored.
In the gure below, with the switches set as shown and a stereo source connected to Input Bus 1,
the speaker will be playing the signal from the Right channel of Input Bus 1. (The Volume and Input
Selector switch settings on Channel 6 don’t matter; they are disabled).

Page 9
Performance Specications
Analog inputs:
Twho bus inputs (Bus 1, Bus 2); each bus has one stereo pair of unbalanced (RCA) inputs
12 individual channel inputs; each channel has one unbalanced (RCA) input
Analog outputs:
2 bus outputs (Bus 1, Bus 2); each bus has one stereo pair of unbalanced (RCA) outputs which
provide a buffered copy of the input signal
Input sensitivity (for full output):
365 mV (8 ohm load)
Speaker outputs:
12 pairs of 5-way binding posts (standard red and black); one pair per channel
(in bridge mode, speakers are connected to the red binding posts of both channels in the zone)
Minimum recommended load impedance:
Individual channels; 4 ohms (which equals one 4 ohm load or two paralleled 8 ohm loads)
Bridged channels; 8 ohms
Power output:
65 watts RMS per channel (x12); into 4 ohms; two channels driven
40 watts RMS per channel (x12); into 4 ohms; all channels driven
120 watts RMS per channel (x6); into 8 ohms (bridged); two channels driven
80 watts RMS per channel (x6); into 8 ohms (bridged); all channels driven
32 watts RMS per channel (x12); into 8 ohms
S/N ratio:
> 95 dB (A-weighted)
Frequency response:
20 Hz to 20 kHz + / - 0.2 dB at 1 watt (- 2.0 dB at 80 kHz)
Trigger and control:
Trigger Input: 3 - 20 V AC or DC
Trigger Output: 12 V DC 100 mA max
Protection:
The PA 12-45 is protected against excessive operating temperature, shorted
speaker connections, ground faults, and other common fault conditions. If a fault occurs,
the PA 12-45 will automatically power down and the front panel status LEDs will indicate the
faulty channel(s). Each channel status indicator shows the status of one zone (a zone is a pair of
channels). If a channel experiences a short or other fault, both channels in that zone (but not the
other zones) will go into protect mode and shut down; the channel status LED for the zone in protect
mode will turn FLASHING blue. To reset the protection, turn the PA 12-45 Off and then On again
using the REAR PANEL POWER SWITCH after the fault has been removed.

Page 10
Features
The PA 12-45 12-Channel Distributed Audio Amplier combines the latest cutting edge technology
with solid engineering and high quality components to deliver superior sound quality, performance,
and features. Some of the more important features of the PA 12-45 include:
• 12 channels of fully discrete, audiophile quality power
• Each channel delivers:
65 watts into 4 ohms
32 watts into 8 ohms
120 watts into 8 ohms (6-channel bridged mode)
• Two stereo input busses and individual channel insert points
• Always-on, auto-sense, and triggered power modes
• Convection cooled; with fan assisted
• Massive toroidal power supply
• Full-sized ve-way binding posts
• Front panel zone status indicators
• Intelligent protection from electrical faults
• Intelligent protection from thermal faults and overheating
• Independent zone fault protection allows other zones to continue operating after one or more
zones have entered protect mode and shut down
• Rack mountable
• 10-year Limited Warranty
You can nd more information about the PA 12-45 12-Channel Distributed Audio Amplier on our
web site at http://www.sherbourn.com.

Page 11
Operation
Turning on the AC power
The AC main power on the PA 12-45 is controlled by the Power rocker switch located on the rear
panel above the power cable. Once the AC power is turned on, the PA 12-45 will remain in Standby
mode until the Power On/Off push button on the front panel is pressed, the Trigger Input is asserted,
or an audio signal is received at an input (depending on how the Power Mode switch is congured).
The Power Mode switch is the small slide switch on the lower left corner of the rear panel labeled
“On/Auto/Trigger.”
Note: Always switch the PA 12-45 Off and then back On using the REAR PANEL POWER
SWITCH after changing the setting on the Power Mode switch.
Status Indicators
When the PA 12-45 is in Standby mode, the single LED next to the front panel On/Off switch (the
On/Off LED) will be lit red; when the PA 12-45 is On, the On/Off LED and the six channel status
LEDs will be lit blue (a blue ashing zone status LED indicates a fault).
Operating the PA 12-45 Manually
When the Power Mode switch is set to “On,” the PA 12-45 is controlled by the front panel On/Off
button. Press the On/Off button once to turn the PA 12-45 On and again to return it to Standby.
Operating the PA 12-45 in Trigger Mode
When the Power Mode is set to “Trigger,” the PA 12-45 is controlled by the presence of a trigger
signal at the rear panel Trigger Input. The PA 12-45 will remain On as long as a trigger signal is
present at the Trigger Input.
Operating the PA 12-45 in Auto Mode
When the Power Mode is set to “Auto,” the PA 12-45 is controlled by the presence of audio signal at
ANY input. The PA 12-45 will switch On immediately when an audio signal is detected at any input,
and will return to Standby mode approximately fteen minutes after audio is no longer present at
any input.
Note: Pressing the front panel On/Off button when the PA 12-45 is in Trigger or Auto mode
and is On will manually override the trigger signal and switch the PA 12-45 Off. In this
condition, the status LEDs will indicate that the PA 12-45 is in Standby mode and response
to the trigger input will be disabled until the On/Off button is pressed a second time or the
override is cleared by switching the REAR PANEL POWER SWITCH Off and back On.
Resetting a fault
If a channel experiences a short or other fault, both channels in that zone (but not the other zones)
will go into protect mode and shut down. The zone status LED for that zone will turn FLASHING
blue. The main Power LED and the other channel status LEDs will remain blue and the other zones
will remain in operation. To reset the protection, turn the PA 12-45 Off and then On again using the
rear panel power switch after the fault has been removed. If the fault indication remains, please refer
to the Troubleshooting section for more options.

Page 12
Periodic Maintenance
The PA 12-45 requires no periodic maintenance.
Cleaning the PA 12-45
• If necessary, the PA 12-45 should be cleaned gently with a soft rag.
• If something sticky gets on the front panel or case of the PA 12-45, it should be cleaned with a
mild cleaning solution applied to a soft rag, followed by wiping with a clean rag dampened with
plain water, and drying with a soft dry rag or cloth.
Note: DO NOT spray water or cleaning solution directly onto the PA 12-45 or into the vents.

Page 13
Troubleshooting
If problems occur, the rst step should be to verify that the PA 12-45 is set to the proper line voltage
for your AC power source and that your power source is operating correctly.
Problem: No sound is heard from any channel (the On/Off LED is not lit)
You have no AC power
• Verify that the circuit is live and the rear panel Power switch is On
• Verify that the line cord on the PA 12-45 is fully inserted and is tight
Problem: No sound is heard from any channel (the On/Off LED is lit red)
The PA 12-45 is in Standby mode
• If the PA 12-45 is in “On” power mode, press the On/Off button
• If the PA 12-45 is in “Trigger” power mode, verify that a trigger signal is present
• If the PA 12-45 is in “Auto” power mode, verify that audio signal is present at an input
• If the PA 12-45 is in “Auto” or “Trigger” mode, yet fails to respond to an appropriate trigger input,
it may be in the manual override mode; switch the power Off and back On (using the rear panel
power rocker switch) to clear the override
Problem: No sound or distorted sound is heard from one or more channels
(the Power LED and all channel status LEDs are lit blue)
The PA 12-45 is On and is not indicating a fault
• Verify that the input conguration for that channel is correct
• Check the Bridge/Stereo switch that controls the pair of channels involved
• Verify that the Volume for that channel is turned down
• Check your source and your input cabling
• Check your speakers and speaker connections
Problem: No sound is heard from one or more channels
(one or more channel status LEDs are FLASHING blue)
The PA 12-45 is indicating a fault on one or more channels (the ashing LEDs correspond to the
zone where a fault has been detected). A fault with either channel in a zone will result in a fault for
that zone; in Stereo/Separate Mode, both channels in that zone will be disabled.
• Verify that the speaker cable(s) and speaker terminals are not shorted
• Verify that the speaker itself is not shorted or damaged
(try the speaker on another channel and see if the fault “moves”)
• Verify that the source is not faulty
(try that input cable on another input and see if the fault “moves”)
• Disconnect all inputs and outputs and reset the PA 12-45
(turn the rear panel Power rocker switch Off and back On)
If the fault condition persists after all inputs and outputs have been disconnected and the
fault has been reset, and the Voltage Select switch is in the proper position, please contact
Sherbourn Technical Support.

Page 14
Sherbourn Technologies, LLC Ten-Year Limited Warranty
What does this warranty cover? Sherbourn Technologies, LLC (“Sherbourn”) warrants its products
against defects in materials and workmanship. This warranty is subject to revision at any time.
How long does this coverage last? This warranty commences on the date of retail purchase by
the original retail purchaser and runs for a period of ten (10) years thereafter, with the following
exceptions: (1) receivers (including the SR-8100, SR-8200, and SR-120), preamp/processors
(including the PT-7030, PT-7020C4, and PT-7020), preampliers (including the PRE-1), and the
CD-1 CD Player (with the exception of the slot load CD engine) are covered by this warranty for
ve (5) years from the date of retail purchase by the original purchaser; and (2) electromechanical
components, including the slot load CD engine on the CD-1 CD Player, and all fans (including
the C-12 Cooling Unit), are covered by this warranty for three (3) years from the date of retail
purchase by the original retail purchaser. This warranty is transferrable, upon written notication
to Sherbourn, to any person that owns the warranted product, however, if ownership is transferred,
the Term shall be no longer than ve (5) years from the date of purchase by the original purchaser.
Sherbourn warrants any replacement product or part furnished hereunder against defects in
materials and workmanship for the longer of the following: (i) the amount of time remaining under
the original warranty, or (ii) 120 days from your receipt of the repaired or replaced product. The
duration described in the previous 3 sentences is hereinafter referred to as the “Term”. TO THE
FULLEST EXTENT PERMITTED BY LAW, ALL IMPLIED WARRANTIES RELATED TO THE
ORIGINAL PRODUCT AND ANY REPLACEMENT PRODUCT OR PARTS (INCLUDING IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE) ARE
EXPRESSLY LIMITED TO THE TERM OF THIS LIMITED WARRANTY. SOME STATES DO
NOT ALLOW LIMITATIONS ON HOW LONG AN IMPLIED WARRANTY LASTS, SO THE ABOVE
LIMITATION MAY NOT APPLY TO YOU. A claim under this warranty must be made by you within
the Term. A claim shall not be valid (and Sherbourn has no obligation related to the claim) if it is not
made within the Term and if it is not made in strict compliance with the requirements of the “How do
you get service?” section.
What will Sherbourn do? Sherbourn will, at its option, either: (i) repair the product, or (ii) replace
the product with a new consumer product which is identical or reasonably equivalent to the product.
Sherbourn may provide you with a refund of the actual purchase price of the product in the event
(i) Sherbourn is unable to provide replacement and repair is not commercially practicable or cannot
be timely made, or (ii) you agree to accept a refund in lieu of other remedies hereunder. When
a product or part is repaired or replaced, any replacement item becomes your property and the
replaced item becomes Sherbourn’s property. When a refund is given, the product for which the
refund is provided must be returned to Sherbourn and becomes Sherbourn’s property.
What is not covered by this warranty? This warranty does not apply: (i) to damage caused by
use with non-Sherbourn products, where the non-Sherbourn product is the cause of the damage;
(ii) to damage caused by service or maintenance performed by anyone who is not a representative
of Sherbourn; (iii) to damage caused by accident, abuse, misuse, ood, re, earthquake or other
external causes; (iv) to a product or part that has been modied after its retail purchase, where
the modication caused or contributed to the damage; (v) to consumable parts, such as batteries;
(vi) normal wear tear; or (vii) if any Sherbourn serial number has been removed or defaced and
Sherbourn cannot otherwise conrm that you are the original retail purchaser or authorized trans-
feree. SHERBOURN SHALL NOT BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL
DAMAGES ARISING FROM OR RELATED TO ANY DEFECTS IN OR DAMAGES TO ITS
PRODUCTS. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF

Page 15
Notes
INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATION OR EXCLUSION
MAY NOT APPLY.
How do you get service? In order to make a claim under the warranty, you must:
1. Call a customer service representative (“CSR”) of Sherbourn at (1-877-EMO-TECH /
1-877-366-8324). Provide the CSR with a description of your problem and the serial number of the
product for which the warranty claim is being made.
2. The CSR will provide you with a returned material authorization number (“RMA”).
3. Ship the product to Sherbourn at the following address, with the RMA written in large,
bold letters on the outside of the box, and with the letters “RMA” written before the number. Parcels
arriving without a RMA number on the outside of the box will be refused.
Sherbourn Technologies, LLC
Attn: Repair Department
135 Southeast Parkway Court
Franklin, TN 37064
How does state law apply? This warranty gives you specic legal rights, and you may also
have other rights which vary from state to state. CERTAIN STATES HAVE ENACTED LAWS
WHICH PRECLUDE THE WAIVER OF CONSEQUENTIAL AND INCIDENTAL DAMAGES AND/
OR PRECLUDE THE WAIVER/LIMITATION OF IMPLIED WARRANTIES. TO THE EXTENT
YOUR STATE HAS ENACTED A LAW WHICH PROHIBITS SUCH A WAIVER/LIMITATION, ALL
SUCH WAIVERS/LIMITATIONS CONTAINED IN THIS WARRANTY ARE INAPPLICABLE TO YOU.
CERTAIN STATES HAVE ENACTED LAWS WHICH REQUIRE THE DURATION OF A WARRANTY
TO BE EXTENDED (INCLUDING BUT NOT LIMITED TO DURING PERIODS OF REPAIR). TO
THE EXTENT YOUR STATE HAS ENACTED A LAW OF THIS NATURE, THEN THE DURATION
OF THIS WARRANTY WILL BE EXTENDED AS REQUIRED BY APPLICABLE LAW.