Sherbourn PA 2-50 User manual
Owner’s Manual
PA 2-50
TWOOCHANNEL FLEX AMPLIFIER
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 sufcient
magnitude to constitute a risk of electrical shock to the user.
Please read this Installation and Operation Manual thoroughly before attempting to install, congure,
or operate the Sherbourn PA 2-50. After successful installation and conguration of the PA 2-50, 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 2-50 and in this manual. The vast majority of the
subsequent safety precautions are common sense. If you are not comfortable with the installation
of audio/video entertainment equipment, you should seek the services of a qualied installation
professional or call us for help.
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT USE THE
PA 2-50 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 2-50 AND 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 2-50. THERE ARE NO USER-SERVICEABLE PARTS INSIDE THE PA 2-50. REFER
ALL SERVICE TO QUALIFIED SERVICE PERSONNEL.
Do not install the PA 2-50 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 2-50 directly above other heat-producing equipment unless sufcient ventilation or forced-air
cooling is provided.
Do not install the PA 2-50 in locations without proper ventilation. The PA 2-50 should not be operated
on a bed, sofa, rug, or similar surface that may block vents. The PA 2-50 should not be installed in an
enclosed location such as a bookcase, cabinet, or closed equipment rack unless sufcient forced-air
ventilation is provided.
Always install your PA 2-50 according to the manufacturer’s instructions and only use attachments or
accessories specied by the manufacturer.
Do not install the PA 2-50 on any stand, shelf, or other piece of furniture that is unable to support its
weight. If a cart is used to move the PA 2-50, use caution to avoid injury from tip-over.
Connect the PA 2-50 only to power sources of the correct voltage (as shown in this manual and on
the PA 2-50). Ensure that the Input Voltage selector switch on the rear of the PA 2-50 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 and the PA 2-50 unit.
Only connect the PA 2-50 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 2-50 power cord, only use one of similar type and equal or
greater current rating.
!
!
The power cable for the PA 2-50 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 2-50 with a fuse(s) of proper value and voltage rating.
The PA 2-50 should only be cleaned as directed in the Installation and Operation Manual. Avoid
spraying liquids directly onto the PA 2-50 and NEVER spray liquids into the vents. Care should be
taken so that small objects do not fall into the inside of the PA 2-50.
You should seek service for your PA 2-50 by qualied 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 2-50 has been exposed to rain.
4. The PA 2-50 exhibits a marked change in performance.
5. The PA 2-50 has been dropped, or its enclosure or chassis is damaged.
NOTE: TO COMPLETELY DISCONNECT THE PA 2-50 FROM THE AC POWER MAINS,
DISCONNECT THE AC POWER CORD FROM THE AC RECEPTACLE.
NOTE: THE PA 2-50’s AC POWER CORD MUST REMAIN READILY ACCESSIBLE AT ALL TIMES.
!
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 2-50 Two-Channel Flex Amplier ...................................................2
About This Manual......................................................................................2
Mechanical and Environmental ..................................................................3
Remote Control ..........................................................................................4
Front Panel.................................................................................................5
Rear Panel..................................................................................................6
Inputs and Outputs .....................................................................................8
Installation Tips...........................................................................................9
Conguration ............................................................................................11
Remote Control Codes and Signal Specications....................................12
Performance Specications......................................................................14
Features ...................................................................................................15
Operation..................................................................................................16
Periodic Maintenance...............................................................................18
Troubleshooting........................................................................................19
Sherbourn Technologies, LLC Five-Year Limited Warranty......................20
Notes ........................................................................................................21
PA 2-50
Two-Channel Flex Amplier
Page 2
Introduction
Thank you for choosing the Sherbourn PA 2-50 Two-Channel Flex Amplier.
The Sherbourn PA 2-50 combines two great sounding audio channels, a precision digitally controlled
analog volume control, automatic input selection, exible remote control and triggering options, and
user-selectable AC supply voltage - all in one compact package.
Design features like proven class A/B technology, Sherbourn’s intelligent protection system, and true
commercial grade construction quality and reliability make the Sherbourn PA 2-50 an obvious choice
when you need a small, exible, great sounding two-channel amp.
About This Manual
This manual will provide you with all the information you need to install and congure the Sherbourn
PA 2-50 Two-Channel Flex Amplier to achieve its optimum potential. The manual also includes a
brief summary of the features offered by the PA 2-50 and 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 2-50 Two-Channel Flex Amplier
The Sherbourn PA 2-50 is a medium-powered, audiophile quality, class A/B power amplier with
a wide variety of input and control options. The PA 2-50 offers two stereo inputs, each of which
can be manually selected or congured to operate automatically, and utilizes a digitally controlled
analog level control, which provides very precise control of gain, very tight channel tracking, perfect
repeatability, and virtually no distortion.
The PA 2-50 offers the usual trigger input, as well as both IR and bi-directional RS-232 serial remote
control. Speaker connections (two sets) are industry standard Phoenix-type removable terminal
blocks; power is via a convenient removable IEC power cord, and is user selectable between 115
VAC and 230 VAC. Direct front panel control is provided for Input selection (with LEDs to indicate
the selected input), Power (an LED indicates status), and Volume control (a row of 8 blue LEDs
displays the volume setting).
Page 3
Mechanical and Environmental
8.5”
14.5”
14”
2.625”
TOP
FRONT
SIDE
3.125”
SHERBOURN
PA 2-50
19”
15”
8.625”
19”
17”
15”
2.375”
3.5”
2.375”
3.5”
UFP x1 (single rack mount kit)
UFP x2 (dual rack mount kit)
Page 4
Dimensions: 8.5” wide x 3.125” high x 14.5” deep (includes feet, binding posts, no rack kit).
Weight: 11.2 lbs / 5.1 kg (unboxed); 14.4 lbs / 6.6 kg (boxed).
Rack mountable: Yes, single or paired, with optional rack mount kits.
Power requirements:
115 VAC or 230 VAC +/- 10% @ 50 / 60 Hz (selectable by rear-panel switch).
Ventilation and cooling:
To avoid overheating, be sure to provide adequate clearance and ventilation.
OFF 1 ON
2 MUTE 3
415
-- VOLUME --
AUTO 29
6INPUT 7
Remote Control
Note: Only certain buttons on the remote control are used.
(On, Off, Mute, Input 1, Input 2, Input Auto, Volume Up, and Volume Down.)
Page 5
Front Panel
DN----------VOLUME ----------UP
STANDBY 1------------AUTO ------------2
1 5432 6
1. Standby Button
Switches (toggles) the unit between Standby and On.
2. Standby LED
Illuminates red for Standby; blue for On, ashing red for a Fault condition.
3. Infrared Detector Window
Used by the infrared remote control.
4. Input Selector Pushbuttons and Input LEDs
Pressing 1 or 2 manually selects that input; pressing Auto instructs the PA 2-50 to use whichever
input has active audio signal on it. (If both inputs are active, Input 1 has priority.) When each input /
mode is selected, the corresponding LED will illuminate.
5. Volume Up and Volume Down Pushbuttons
Press and hold either button to increase or decrease volume gradually.
6. Volume LEDs (8)
These LEDs indicate the approximate volume setting.
Note: The Volume on the PA 2-50 can be set in very small increments; the LEDs only show an
approximation of the current setting.
Page 6
Rear Panel
1, 2. Inputs (one stereo pair for each input; unbalanced)
Connect your line level inputs to these.
3. Outputs (one stereo pair; unbalanced)
Stereo passthrough output carries the selected input signal for chaining other devices.
4. Speaker Outputs (two each for left and right channel)
Phoenix-type connectors for connecting up to two pairs of speakers.
5. Power Switch
Switches the AC mains power to the PA 2-50 On and Off. When this switch is Off, the PA 2-50 will
not respond to trigger signals or manual controls.
6. Input Voltage Selector Switch
Always ensure that this switch is set for the proper line voltage for your area and installation.
7. RS-232 Serial Remote Control Interface
Accepts RS-232 control codes from a wired serial remote control.
Refer to the Remote Control Codes and Signal Specications section for details.
8. Trigger Input
The Trigger Input is used to allow other trigger-enabled equipment to switch the PA 2-50 between
On and Standby.
LEFT RIGHT LEFT RIGHT
RS-232 CONTROL
INPUT 1 INPUT 2 OUTPUT SPEAKER OUTPUTS
+ - + - + - + -
TRIGGER
IN
IR IN
ON
OFF
AUTO
AC INPUT
ON OFF
POWER
115
L
R
1 5432 6
7119 108
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